Lock and Key allows us to dynamically change an access-list using the access-enable command.
Let us consider a simple topology of R4 Connected to R5 Connected to R6
R4 is representing a host device we're using with R5 as its default gateway with R5 and R6 having dynamic routing between them.
Relevant Config:
R4
hostname R4
interface FastEthernet0/0
ip address 192.168.101.4 255.255.255.0
duplex auto
speed auto
!
ip route 0.0.0.0 0.0.0.0 192.168.101.5
R5
hostname R5
username bob password 0 test
!
interface FastEthernet0/1
description LAN Interface
ip address 192.168.101.5 255.255.255.0
ip access-group 104 in
duplex auto
speed auto
!
interface Loopback0
ip address 5.5.5.5 255.255.255.255
!
access-list 104 permit tcp host 192.168.101.4 host 5.5.5.5 eq telnet
access-list 104 dynamic R4Telnet permit tcp host 192.168.101.4 any eq telnet
access-list 104 deny tcp host 192.168.101.4 any eq telnet
!
line vty 0 4
login local
autocommand access-enable timeout 5
!
We aren't showing R6's config or the routing with R5 as it's not relevant here
The interesting stuff in this example happens on R5
By default the dynamic lines in the access-list are ignored - so we can see that R4 can telnet into R5's Loopback0 but nowhere else.
R5#sh ip access-list
Extended IP access list 104
10 permit tcp host 192.168.101.4 host 5.5.5.5 eq telnet
20 Dynamic R4Telnet permit tcp host 192.168.101.4 any eq telnet
30 deny tcp host 192.168.101.4 any eq telnet
When Someone telnets into R5 thanks to the autocommand line in the line vty 0 4 section, the access-enable command will enable the dynamic entry in the ACL for the period of time defined (5 minutes)
R4>telnet 5.5.5.5
Trying 5.5.5.5 ... Open
User Access Verification
Username: bob
Password:
[Connection to 5.5.5.5 closed by foreign host]
Lets see what has happened with the acl now
R5#sh ip access-list
Extended IP access list 104
10 permit tcp host 192.168.101.4 host 5.5.5.5 eq telnet (47 matches)
20 Dynamic R4Telnet permit tcp host 192.168.101.4 any eq telnet
permit tcp host 192.168.101.4 any eq telnet
30 deny tcp host 192.168.101.4 any eq telnet
We can see that line 20 is now active and will take precedence to the deny in line 30
R4>telnet 6.6.6.6
Trying 6.6.6.6 ... Open
User Access Verification
Username: bob
Password:
R6>
Looks good. So What about that timeout business?
R5#sh ip access-list
Extended IP access list 104
10 permit tcp host 192.168.101.4 host 5.5.5.5 eq telnet (47 matches)
20 Dynamic R4Telnet permit tcp host 192.168.101.4 any eq telnet
permit tcp host 192.168.101.4 any eq telnet (28 matches) (time left 297)
30 deny tcp host 192.168.101.4 any eq telnet
We can see it counting down. If we had wanted it so that the session would automatically extend beyond the initial 5 minutes indefinitely (but still timeout after 5 minutes of no activity) we add this to R5:
R5(config)#access-list dynamic-extended
Which would restart the time-out every time new traffic matched the dynamic acl entry.
Saturday, 30 April 2011
Saturday, 16 April 2011
Frame Relay End-To-End Keepalive (FREEK)
Another Frame-Relay Topic...
LMI is pretty good but may not always something you can use. Say you have back to back routers, R4 and R7 both connected to each other at S0/0 and you don't want to set one of them up to be a Frame Relay switch because sooner or later we'll be hooking them up to a WAN provider that has a Frame Switch.
It would still be very much a good idea to be able to verify that we have end to end service continuity. Why would we care? It's handy to know if the peer has gone down since we might be using enhanced object tracking.
R4 is the Internet router for R7
R4
hostname R4
interface Serial0/0
description R7 S0/0
no ip address
encapsulation frame-relay
no keepalive
clock rate 2000000
no frame-relay inverse-arp
!
interface Serial0/0.16 point-to-point
ip address 1.1.1.4 255.255.255.0
frame-relay interface-dlci 16
!
int loopback 1
ip address 9.9.9.9 255.255.255.255
R7
hostname R7
interface Serial0/0
description R4 S0/0
Lets validate that service is operational:
R7#sh frame pvc
PVC Statistics for interface Serial0/0 (Frame Relay DTE)
Active Inactive Deleted Static
Local 1 0 0 0
Switched 0 0 0 0
Unused 0 0 0 0
DLCI = 16, DLCI USAGE = LOCAL, PVC STATUS = STATIC, INTERFACE = Serial0/0.16
input pkts 137 output pkts 192 in bytes 13936
out bytes 18989 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
in FECN pkts 0 in BECN pkts 0 out FECN pkts 0
out BECN pkts 0 in DE pkts 0 out DE pkts 0
out bcast pkts 39 out bcast bytes 12714
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 00:38:57, last time pvc status changed 00:06:55
R7#sh track
Track 1
Interface Serial0/0.16 line-protocol
Line protocol is Up
5 changes, last change 00:06:59
Tracked by:
STATIC-IP-ROUTING 0
R7#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 1.1.1.4 to network 0.0.0.0
1.0.0.0/24 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Serial0/0.16
S* 0.0.0.0/0 [1/0] via 1.1.1.4
R7#ping 9.9.9.9
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 9.9.9.9, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/5/16 ms
So far so good. Ideally R7 would be able to withdraw the default route if the PVC to R4 fails - we can quite easily simulate this by shutting down R4's S0/0.16 interface.
R4(config)#int s0/0.16
R4(config-subif)#shut
We wait around for a few minutes and R7 is none the wiser.
R7#sh frame pvc
PVC Statistics for interface Serial0/0 (Frame Relay DTE)
Active Inactive Deleted Static
Local 1 0 0 0
Switched 0 0 0 0
Unused 0 0 0 0
DLCI = 16, DLCI USAGE = LOCAL, PVC STATUS = STATIC, INTERFACE = Serial0/0.16
input pkts 147 output pkts 205 in bytes 15810
out bytes 21391 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
in FECN pkts 0 in BECN pkts 0 out FECN pkts 0
out BECN pkts 0 in DE pkts 0 out DE pkts 0
out bcast pkts 44 out bcast bytes 14344
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 00:43:31, last time pvc status changed 00:11:30
R7#ping 9.9.9.9
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 9.9.9.9, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
Since the physical interface stays up and we don't have LMI letting us know that there's a problem we cant determine that there is a problem with the PVC. This is where Frame-Relay End-to-end Keepalive (FREEK) comes into play. There are a number of parameters associated with it but the simple case will be demonstrated here:
R4/R7
map-class frame-relay FREEK
frame-relay end-to-end keepalive mode bidirectional
interface Serial0/0.16 point-to-point
frame-relay interface-dlci 16
class FREEK
While R4 s0/0.16 is still shut down we can see that this appears to be working in that the link is down and the default route is no longer present.
On R7:
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
So Lets repair the fault:
R4(config)#int s0/0.16
R4(config-subif)#no shut
On R7:
*Mar 1 00:52:49.131: %TRACKING-5-STATE: 1 interface Se0/0.16 line-protocol Down->Up
R7#sh frame pvc
PVC Statistics for interface Serial0/0 (Frame Relay DTE)
Active Inactive Deleted Static
Local 1 0 0 0
Switched 0 0 0 0
Unused 0 0 0 0
DLCI = 16, DLCI USAGE = LOCAL, PVC STATUS = STATIC (EEK UP), INTERFACE = Serial0/0.16
input pkts 157 output pkts 250 in bytes 16892
out bytes 25205 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
in FECN pkts 0 in BECN pkts 0 out FECN pkts 0
out BECN pkts 0 in DE pkts 0 out DE pkts 0
out bcast pkts 52 out bcast bytes 16952
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 00:51:26, last time pvc status changed 00:00:27
R7#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 1.1.1.4 to network 0.0.0.0
1.0.0.0/24 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Serial0/0.16
S* 0.0.0.0/0 [1/0] via 1.1.1.4
R7#ping 9.9.9.9
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 9.9.9.9, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/5/16 ms
So that's the basics on FREEK.
LMI is pretty good but may not always something you can use. Say you have back to back routers, R4 and R7 both connected to each other at S0/0 and you don't want to set one of them up to be a Frame Relay switch because sooner or later we'll be hooking them up to a WAN provider that has a Frame Switch.
It would still be very much a good idea to be able to verify that we have end to end service continuity. Why would we care? It's handy to know if the peer has gone down since we might be using enhanced object tracking.
R4 is the Internet router for R7
R4
hostname R4
interface Serial0/0
description R7 S0/0
no ip address
encapsulation frame-relay
no keepalive
clock rate 2000000
no frame-relay inverse-arp
!
interface Serial0/0.16 point-to-point
ip address 1.1.1.4 255.255.255.0
frame-relay interface-dlci 16
!
int loopback 1
ip address 9.9.9.9 255.255.255.255
R7
hostname R7
interface Serial0/0
description R4 S0/0
no ip address
encapsulation frame-relay
no keepalive
no frame-relay inverse-arp
!
interface Serial0/0.16 point-to-point
ip address 1.1.1.7 255.255.255.0
frame-relay interface-dlci 16
!
track 1 interface s0/0.16 line-protocol
ip route 0.0.0.0 0.0.0.0 1.1.1.4 track 1
encapsulation frame-relay
no keepalive
no frame-relay inverse-arp
!
interface Serial0/0.16 point-to-point
ip address 1.1.1.7 255.255.255.0
frame-relay interface-dlci 16
!
track 1 interface s0/0.16 line-protocol
ip route 0.0.0.0 0.0.0.0 1.1.1.4 track 1
PVC Statistics for interface Serial0/0 (Frame Relay DTE)
Active Inactive Deleted Static
Local 1 0 0 0
Switched 0 0 0 0
Unused 0 0 0 0
DLCI = 16, DLCI USAGE = LOCAL, PVC STATUS = STATIC, INTERFACE = Serial0/0.16
input pkts 137 output pkts 192 in bytes 13936
out bytes 18989 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
in FECN pkts 0 in BECN pkts 0 out FECN pkts 0
out BECN pkts 0 in DE pkts 0 out DE pkts 0
out bcast pkts 39 out bcast bytes 12714
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 00:38:57, last time pvc status changed 00:06:55
R7#sh track
Track 1
Interface Serial0/0.16 line-protocol
Line protocol is Up
5 changes, last change 00:06:59
Tracked by:
STATIC-IP-ROUTING 0
R7#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 1.1.1.4 to network 0.0.0.0
1.0.0.0/24 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Serial0/0.16
S* 0.0.0.0/0 [1/0] via 1.1.1.4
R7#ping 9.9.9.9
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 9.9.9.9, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/5/16 ms
So far so good. Ideally R7 would be able to withdraw the default route if the PVC to R4 fails - we can quite easily simulate this by shutting down R4's S0/0.16 interface.
R4(config)#int s0/0.16
R4(config-subif)#shut
We wait around for a few minutes and R7 is none the wiser.
R7#sh frame pvc
PVC Statistics for interface Serial0/0 (Frame Relay DTE)
Active Inactive Deleted Static
Local 1 0 0 0
Switched 0 0 0 0
Unused 0 0 0 0
DLCI = 16, DLCI USAGE = LOCAL, PVC STATUS = STATIC, INTERFACE = Serial0/0.16
input pkts 147 output pkts 205 in bytes 15810
out bytes 21391 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
in FECN pkts 0 in BECN pkts 0 out FECN pkts 0
out BECN pkts 0 in DE pkts 0 out DE pkts 0
out bcast pkts 44 out bcast bytes 14344
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 00:43:31, last time pvc status changed 00:11:30
R7#ping 9.9.9.9
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 9.9.9.9, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
Since the physical interface stays up and we don't have LMI letting us know that there's a problem we cant determine that there is a problem with the PVC. This is where Frame-Relay End-to-end Keepalive (FREEK) comes into play. There are a number of parameters associated with it but the simple case will be demonstrated here:
R4/R7
map-class frame-relay FREEK
frame-relay end-to-end keepalive mode bidirectional
interface Serial0/0.16 point-to-point
frame-relay interface-dlci 16
class FREEK
While R4 s0/0.16 is still shut down we can see that this appears to be working in that the link is down and the default route is no longer present.
On R7:
*Mar 1 00:49:41.687: %SYS-5-CONFIG_I: Configured from console by console
*Mar 1 00:49:59.715: %FR_EEK-5-FAILED: Interface Serial0/0.16 - DLCI 16
*Mar 1 00:49:59.727: %TRACKING-5-STATE: 1 interface Se0/0.16 line-protocol Up->Down
*Mar 1 00:49:59.715: %FR_EEK-5-FAILED: Interface Serial0/0.16 - DLCI 16
*Mar 1 00:49:59.727: %TRACKING-5-STATE: 1 interface Se0/0.16 line-protocol Up->Down
R7#sh frame pvc
PVC Statistics for interface Serial0/0 (Frame Relay DTE)
Active Inactive Deleted Static
Local 0 1 0 0
Switched 0 0 0 0
Unused 0 0 0 0
DLCI = 16, DLCI USAGE = LOCAL, PVC STATUS = STATIC (EEK DOWN), INTERFACE = Serial0/0.16
input pkts 147 output pkts 225 in bytes 15810
out bytes 24073 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
in FECN pkts 0 in BECN pkts 0 out FECN pkts 0
out BECN pkts 0 in DE pkts 0 out DE pkts 0
out bcast pkts 49 out bcast bytes 15974
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 00:48:21, last time pvc status changed 00:00:12
R7#sh frame end-to-end keepalive
End-to-end Keepalive Statistics for Interface Serial0/0 (Frame Relay DTE)
DLCI = 16, DLCI USAGE = LOCAL, VC STATUS = STATIC (EEK DOWN)
SEND SIDE STATISTICS
Send Sequence Number: 255, Receive Sequence Number: 0
Configured Event Window: 3, Configured Error Threshold: 2
Total Observed Events: 4, Total Observed Errors: 4
Monitored Events: 3, Monitored Errors: 3
Successive Successes: 0, End-to-end VC Status: DOWN
RECEIVE SIDE STATISTICS
Send Sequence Number: 0, Receive Sequence Number: 0
Configured Event Window: 3, Configured Error Threshold: 2
Total Observed Events: 2, Total Observed Errors: 2
Monitored Events: 2, Monitored Errors: 2
Successive Successes: 0, End-to-end VC Status: DOWN
Failures Since Started: 1, Last Failure: 00:00:23
R7#sh track
Track 1
Interface Serial0/0.16 line-protocol
Line protocol is Down (sw down)
6 changes, last change 00:00:26
Tracked by:
STATIC-IP-ROUTING 0
R7#sh ip routePVC Statistics for interface Serial0/0 (Frame Relay DTE)
Active Inactive Deleted Static
Local 0 1 0 0
Switched 0 0 0 0
Unused 0 0 0 0
DLCI = 16, DLCI USAGE = LOCAL, PVC STATUS = STATIC (EEK DOWN), INTERFACE = Serial0/0.16
input pkts 147 output pkts 225 in bytes 15810
out bytes 24073 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
in FECN pkts 0 in BECN pkts 0 out FECN pkts 0
out BECN pkts 0 in DE pkts 0 out DE pkts 0
out bcast pkts 49 out bcast bytes 15974
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 00:48:21, last time pvc status changed 00:00:12
R7#sh frame end-to-end keepalive
End-to-end Keepalive Statistics for Interface Serial0/0 (Frame Relay DTE)
DLCI = 16, DLCI USAGE = LOCAL, VC STATUS = STATIC (EEK DOWN)
SEND SIDE STATISTICS
Send Sequence Number: 255, Receive Sequence Number: 0
Configured Event Window: 3, Configured Error Threshold: 2
Total Observed Events: 4, Total Observed Errors: 4
Monitored Events: 3, Monitored Errors: 3
Successive Successes: 0, End-to-end VC Status: DOWN
RECEIVE SIDE STATISTICS
Send Sequence Number: 0, Receive Sequence Number: 0
Configured Event Window: 3, Configured Error Threshold: 2
Total Observed Events: 2, Total Observed Errors: 2
Monitored Events: 2, Monitored Errors: 2
Successive Successes: 0, End-to-end VC Status: DOWN
Failures Since Started: 1, Last Failure: 00:00:23
R7#sh track
Track 1
Interface Serial0/0.16 line-protocol
Line protocol is Down (sw down)
6 changes, last change 00:00:26
Tracked by:
STATIC-IP-ROUTING 0
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
So Lets repair the fault:
R4(config)#int s0/0.16
R4(config-subif)#no shut
On R7:
*Mar 1 00:52:49.131: %TRACKING-5-STATE: 1 interface Se0/0.16 line-protocol Down->Up
R7#sh frame pvc
PVC Statistics for interface Serial0/0 (Frame Relay DTE)
Active Inactive Deleted Static
Local 1 0 0 0
Switched 0 0 0 0
Unused 0 0 0 0
DLCI = 16, DLCI USAGE = LOCAL, PVC STATUS = STATIC (EEK UP), INTERFACE = Serial0/0.16
input pkts 157 output pkts 250 in bytes 16892
out bytes 25205 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
in FECN pkts 0 in BECN pkts 0 out FECN pkts 0
out BECN pkts 0 in DE pkts 0 out DE pkts 0
out bcast pkts 52 out bcast bytes 16952
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 00:51:26, last time pvc status changed 00:00:27
R7#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 1.1.1.4 to network 0.0.0.0
1.0.0.0/24 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Serial0/0.16
S* 0.0.0.0/0 [1/0] via 1.1.1.4
R7#ping 9.9.9.9
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 9.9.9.9, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/5/16 ms
So that's the basics on FREEK.
Sunday, 10 April 2011
Multilink Frame Relay (MFR) and Multilink PPP (ML-PPP)
This post is about non-etherchannel link bundling a way to increase bandwidth and resiliency with the layer 3 result appearing as a single Layer 3 link between nodes using multiple WAN links.
So lets start with Routers R4 and R7, each has 4 serial interfaces that are back to back (R4 s0/0 to R7 s0/0, R4 s0/1 to R7 s0/1, R4 s1/0 to R7 s1/0 and R4 s1/1 to R7 s1/1)
Start with a multilink frame relay (MFR) for the first two links (since we're not using a Frame Switch here so we're going to turn FR LMI off)
R4
hostname R4
int mfr 1
no keepalive
no shut
int s0/0
shutdown
encapsulation frame-relay mfr 1
no shut
int s0/1
shutdown
encapsulation frame-relay mfr 1
no shut
int mfr1.47 point-to-point
ip address 47.47.47.4 255.255.255.0
frame-relay interface-dlci 47
R7
hostname R7
int mfr 1
no keepalive
no shut
int s0/0
shutdown
encapsulation frame-relay mfr 1
no shut
int s0/1
shutdown
encapsulation frame-relay mfr 1
no shut
int mfr1.47 point-to-point
ip address 47.47.47.7 255.255.255.0
frame-relay interface-dlci 47
So lets check that is operating.
R4#sh frame pvc
PVC Statistics for interface MFR1 (Frame Relay DTE)
Active Inactive Deleted Static
Local 1 0 0 0
Switched 0 0 0 0
Unused 0 0 0 0
DLCI = 47, DLCI USAGE = LOCAL, PVC STATUS = STATIC, INTERFACE = MFR1.47
input pkts 3 output pkts 3 in bytes 963
out bytes 963 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
in FECN pkts 0 in BECN pkts 0 out FECN pkts 0
out BECN pkts 0 in DE pkts 0 out DE pkts 0
out bcast pkts 3 out bcast bytes 963
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 00:00:28, last time pvc status changed 00:00:14
R4#ping 47.47.47.7
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 47.47.47.7, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/5/16 ms
R4#sh frame-relay multilink
Bundle: MFR1, State = up, class = A, fragmentation disabled
BID = MFR1
Bundle links:
Serial0/1, HW state = up, link state = Up, LID = Serial0/1
Serial0/0, HW state = up, link state = Up, LID = Serial0/0
Okay, so multilink frame relay is relatively straight forward to get going. Lets park that for the moment and look at getting multilink PPP operational
R4
int mfr1.47 point-to-point
no ip address
interface Multilink1
ip address 47.47.47.4 255.255.255.0
ppp multilink
ppp multilink group 1
int s1/0
shutdown
encapsulation ppp
ppp multilink
ppp multilink group 1
no shut
int s1/1
shutdown
encapsulation ppp
ppp multilink
ppp multilink group 1
no shut
R7
int mfr1.47 point-to-point
no ip address
interface Multilink1
ip address 47.47.47.7 255.255.255.0
ppp multilink
ppp multilink group 1
int s1/0
shutdown
encapsulation ppp
ppp multilink
ppp multilink group 1
no shut
int s1/1
shutdown
encapsulation ppp
ppp multilink
ppp multilink group 1
no shut
So lets check that this is working.
R7#ping 47.47.47.4
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 47.47.47.4, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/9/24 ms
R7#sh ppp multi
Multilink1
Bundle name: R4
Remote Endpoint Discriminator: [1] R4
Local Endpoint Discriminator: [1] R7
Bundle up for 00:00:26, total bandwidth 3088, load 1/255
Receive buffer limit 24000 bytes, frag timeout 1000 ms
0/0 fragments/bytes in reassembly list
0 lost fragments, 7 reordered
0/0 discarded fragments/bytes, 0 lost received
0xF received sequence, 0xD sent sequence
Member links: 2 active, 0 inactive (max not set, min not set)
Se1/0, since 00:00:21
Se1/1, since 00:00:20
No inactive multilink interfaces
No problems, we can see that the bandwidth is 3088kbps (1544 kbps default per serial interface). Ok, so just for fun, how about including the Frame Relay links with this bundle? It's certainly possible, we just need to put ppp over frame and include it in the multilink group.
R4/47
interface Virtual-Template1
no ip address
ppp multilink
ppp multilink group 1
interface MFR1.47 point-to-point
frame-relay interface-dlci 47 ppp Virtual-Template1
However it's not quite as simple as it seems to get it going..
*Mar 1 00:14:13.559: %LINK-3-UPDOWN: Interface Virtual-Access2, changed state to up
*Mar 1 00:14:25.547: %FR-3-MLPOFR_ERROR: MLPoFR not configured properly on Link Virtual-Access2 Bundle Multilink1 :Frame Relay traffic shaping must be enabled
*Mar 1 00:14:26.539: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access2, changed state to up
We need some traffic shaping on the FR (MFR1) interface - remember if we just turn traffic shaping on, all PVCs will be shaped at 56kbps. For this example, we'll assume that there is 256kbps per PVC available
R4/47
map-class frame-relay MFR
frame-relay traffic-rate 512000
interface MFR1
frame-relay traffic-shaping
interface MFR1.47 point-to-point
frame-relay interface-dlci 47 ppp Virtual-Template1
class MFR
Lets bounce the link and see if it's happy this time round.
R7(config-if)#int mfr1
R7(config-if)#shut
*Mar 1 00:22:30.247: %LINK-5-CHANGED: Interface MFR1, changed state to administratively down
*Mar 1 00:22:30.247: %LINK-3-UPDOWN: Interface Virtual-Access2, changed state to down
*Mar 1 00:22:31.247: %LINEPROTO-5-UPDOWN: Line protocol on Interface MFR1, changed state to down
*Mar 1 00:22:31.251: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access2, changed state to down
*Mar 1 00:22:33.255: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, changed state to down
*Mar 1 00:22:33.259: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to down
R7(config-if)#no shut
*Mar 1 00:22:46.619: %LINK-3-UPDOWN: Interface MFR1, changed state to down
*Mar 1 00:22:54.215: %LINK-3-UPDOWN: Interface MFR1, changed state to up
*Mar 1 00:22:54.263: %LINK-3-UPDOWN: Interface Virtual-Access2, changed state to up
*Mar 1 00:22:55.207: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, changed state to up
*Mar 1 00:22:55.215: %LINEPROTO-5-UPDOWN: Line protocol on Interface MFR1, changed state to up
*Mar 1 00:22:55.219: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to up
*Mar 1 00:22:55.263: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access2, changed state to up
No complaints this time...
R7(config-if)#do ping 47.47.47.4
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 47.47.47.4, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/6/16 ms
R7(config-if)#do sh users
Line User Host(s) Idle Location
* 0 con 0 idle 00:00:00
Interface User Mode Idle Peer Address
Vi2 PPPoFR 00:01:06
Se1/0 Sync PPP 00:00:05
Se1/1 Sync PPP 00:00:05
Mu1 Sync PPP 00:00:54 47.47.47.4
Looks good so far, lets confirm what the multilink PPP interface thinks its bandwidth is (it should be 1544 * 2 for the direct PPP links and 512 for the MFR link)
R7(config-if)#do sh ppp multi
Multilink1
Bundle name: R4
Remote Endpoint Discriminator: [1] R4
Local Endpoint Discriminator: [1] R7
Bundle up for 00:24:11, total bandwidth 3344, load 1/255
Receive buffer limit 36000 bytes, frag timeout 1000 ms
0/0 fragments/bytes in reassembly list
0 lost fragments, 13 reordered
0/0 discarded fragments/bytes, 0 lost received
0x32 received sequence, 0x30 sent sequence
Member links: 3 active, 1 inactive (max not set, min not set)
Se1/0, since 00:24:06, 5790 weight, 1496 frag size
Se1/1, since 00:24:05, 5790 weight, 1496 frag size
Vi2, since 00:04:21, 960 weight, 950 frag size
Vt1 (inactive)
No inactive multilink interfaces
We can see that the multilink interface thinks it has 3344 kbps of bandwidth and not 3600.
R7#sh int virtual-access 2
Virtual-Access2 is up, line protocol is up
Hardware is Virtual Access interface
MTU 1500 bytes, BW 256 Kbit/sec, DLY 100000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation PPP, LCP Open, multilink Open
Link is a member of Multilink bundle Multilink1
PPPoFR vaccess, cloned from Virtual-Template1
Vaccess status 0x44
Bound to MFR1.47 DLCI 47, Cloned from Virtual-Template1, loopback not set
Keepalive set (10 sec)
DTR is pulsed for 5 seconds on reset
Last input 00:02:02, output never, output hang never
Last clearing of "show interface" counters 00:20:59
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
253 packets input, 5890 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
254 packets output, 5393 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
Virtual-Access2 believes that there is 256kbps of bandwidth available rather than the expected 512kbps. Lets modify the bandwidth associated with Virtual-Template 1 (since the Virtual-Access interface inherits data from it) and see if that helps.
R7(config-if)#int virtual-template 1
R7(config-if)#bandwidth 512
R7(config-if)#int mfr1
R7(config-if)#shut
R7(config-if)#no shut
*Mar 1 00:40:48.283: %LINK-5-CHANGED: Interface MFR1, changed state to administratively down
*Mar 1 00:40:48.287: %LINK-3-UPDOWN: Interface Virtual-Access2, changed state to down
*Mar 1 00:40:49.295: %LINEPROTO-5-UPDOWN: Line protocol on Interface MFR1, changed state to down
*Mar 1 00:40:49.299: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access2, changed state to down
*Mar 1 00:40:49.647: %LINK-3-UPDOWN: Interface MFR1, changed state to down
*Mar 1 00:40:51.295: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, changed state to down
*Mar 1 00:40:51.299: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to down
*Mar 1 00:40:58.259: %LINK-3-UPDOWN: Interface MFR1, changed state to up
*Mar 1 00:40:58.311: %LINK-3-UPDOWN: Interface Virtual-Access2, changed state to up
*Mar 1 00:40:59.251: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, changed state to up
*Mar 1 00:40:59.259: %LINEPROTO-5-UPDOWN: Line protocol on Interface MFR1, changed state to up
*Mar 1 00:40:59.267: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to up
*Mar 1 00:40:59.311: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access2, changed state to up
R7(config-if)#do sh ppp multi
Multilink1
Bundle name: R4
Remote Endpoint Discriminator: [1] R4
Local Endpoint Discriminator: [1] R7
Bundle up for 00:32:49, total bandwidth 3600, load 1/255
Receive buffer limit 36000 bytes, frag timeout 1000 ms
0/0 fragments/bytes in reassembly list
0 lost fragments, 13 reordered
0/0 discarded fragments/bytes, 0 lost received
0x3A received sequence, 0x38 sent sequence
Member links: 3 active, 1 inactive (max not set, min not set)
Se1/0, since 00:32:44, 5790 weight, 1496 frag size
Se1/1, since 00:32:43, 5790 weight, 1496 frag size
Vi2, since 00:00:09, 1920 weight, 1496 frag size
Vt1 (inactive)
No inactive multilink interfaces
Okay, repeat the same thing on R4 and that should be it. Would anyone want to do this in the real world? I certainly hope not!
So lets start with Routers R4 and R7, each has 4 serial interfaces that are back to back (R4 s0/0 to R7 s0/0, R4 s0/1 to R7 s0/1, R4 s1/0 to R7 s1/0 and R4 s1/1 to R7 s1/1)
Start with a multilink frame relay (MFR) for the first two links (since we're not using a Frame Switch here so we're going to turn FR LMI off)
R4
hostname R4
int mfr 1
no keepalive
no shut
int s0/0
shutdown
encapsulation frame-relay mfr 1
no shut
int s0/1
shutdown
encapsulation frame-relay mfr 1
no shut
int mfr1.47 point-to-point
ip address 47.47.47.4 255.255.255.0
frame-relay interface-dlci 47
R7
hostname R7
int mfr 1
no keepalive
no shut
int s0/0
shutdown
encapsulation frame-relay mfr 1
no shut
int s0/1
shutdown
encapsulation frame-relay mfr 1
no shut
int mfr1.47 point-to-point
ip address 47.47.47.7 255.255.255.0
frame-relay interface-dlci 47
So lets check that is operating.
R4#sh frame pvc
PVC Statistics for interface MFR1 (Frame Relay DTE)
Active Inactive Deleted Static
Local 1 0 0 0
Switched 0 0 0 0
Unused 0 0 0 0
DLCI = 47, DLCI USAGE = LOCAL, PVC STATUS = STATIC, INTERFACE = MFR1.47
input pkts 3 output pkts 3 in bytes 963
out bytes 963 dropped pkts 0 in pkts dropped 0
out pkts dropped 0 out bytes dropped 0
in FECN pkts 0 in BECN pkts 0 out FECN pkts 0
out BECN pkts 0 in DE pkts 0 out DE pkts 0
out bcast pkts 3 out bcast bytes 963
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
pvc create time 00:00:28, last time pvc status changed 00:00:14
R4#ping 47.47.47.7
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 47.47.47.7, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/5/16 ms
R4#sh frame-relay multilink
Bundle: MFR1, State = up, class = A, fragmentation disabled
BID = MFR1
Bundle links:
Serial0/1, HW state = up, link state = Up, LID = Serial0/1
Serial0/0, HW state = up, link state = Up, LID = Serial0/0
Okay, so multilink frame relay is relatively straight forward to get going. Lets park that for the moment and look at getting multilink PPP operational
R4
int mfr1.47 point-to-point
no ip address
interface Multilink1
ip address 47.47.47.4 255.255.255.0
ppp multilink
ppp multilink group 1
int s1/0
shutdown
encapsulation ppp
ppp multilink
ppp multilink group 1
no shut
int s1/1
shutdown
encapsulation ppp
ppp multilink
ppp multilink group 1
no shut
R7
int mfr1.47 point-to-point
no ip address
interface Multilink1
ip address 47.47.47.7 255.255.255.0
ppp multilink
ppp multilink group 1
int s1/0
shutdown
encapsulation ppp
ppp multilink
ppp multilink group 1
no shut
int s1/1
shutdown
encapsulation ppp
ppp multilink
ppp multilink group 1
no shut
So lets check that this is working.
R7#ping 47.47.47.4
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 47.47.47.4, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/9/24 ms
R7#sh ppp multi
Multilink1
Bundle name: R4
Remote Endpoint Discriminator: [1] R4
Local Endpoint Discriminator: [1] R7
Bundle up for 00:00:26, total bandwidth 3088, load 1/255
Receive buffer limit 24000 bytes, frag timeout 1000 ms
0/0 fragments/bytes in reassembly list
0 lost fragments, 7 reordered
0/0 discarded fragments/bytes, 0 lost received
0xF received sequence, 0xD sent sequence
Member links: 2 active, 0 inactive (max not set, min not set)
Se1/0, since 00:00:21
Se1/1, since 00:00:20
No inactive multilink interfaces
No problems, we can see that the bandwidth is 3088kbps (1544 kbps default per serial interface). Ok, so just for fun, how about including the Frame Relay links with this bundle? It's certainly possible, we just need to put ppp over frame and include it in the multilink group.
R4/47
interface Virtual-Template1
no ip address
ppp multilink
ppp multilink group 1
interface MFR1.47 point-to-point
frame-relay interface-dlci 47 ppp Virtual-Template1
However it's not quite as simple as it seems to get it going..
*Mar 1 00:14:13.559: %LINK-3-UPDOWN: Interface Virtual-Access2, changed state to up
*Mar 1 00:14:25.547: %FR-3-MLPOFR_ERROR: MLPoFR not configured properly on Link Virtual-Access2 Bundle Multilink1 :Frame Relay traffic shaping must be enabled
*Mar 1 00:14:26.539: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access2, changed state to up
We need some traffic shaping on the FR (MFR1) interface - remember if we just turn traffic shaping on, all PVCs will be shaped at 56kbps. For this example, we'll assume that there is 256kbps per PVC available
R4/47
map-class frame-relay MFR
frame-relay traffic-rate 512000
interface MFR1
frame-relay traffic-shaping
interface MFR1.47 point-to-point
frame-relay interface-dlci 47 ppp Virtual-Template1
class MFR
Lets bounce the link and see if it's happy this time round.
R7(config-if)#int mfr1
R7(config-if)#shut
*Mar 1 00:22:30.247: %LINK-5-CHANGED: Interface MFR1, changed state to administratively down
*Mar 1 00:22:30.247: %LINK-3-UPDOWN: Interface Virtual-Access2, changed state to down
*Mar 1 00:22:31.247: %LINEPROTO-5-UPDOWN: Line protocol on Interface MFR1, changed state to down
*Mar 1 00:22:31.251: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access2, changed state to down
*Mar 1 00:22:33.255: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, changed state to down
*Mar 1 00:22:33.259: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to down
R7(config-if)#no shut
*Mar 1 00:22:46.619: %LINK-3-UPDOWN: Interface MFR1, changed state to down
*Mar 1 00:22:54.215: %LINK-3-UPDOWN: Interface MFR1, changed state to up
*Mar 1 00:22:54.263: %LINK-3-UPDOWN: Interface Virtual-Access2, changed state to up
*Mar 1 00:22:55.207: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, changed state to up
*Mar 1 00:22:55.215: %LINEPROTO-5-UPDOWN: Line protocol on Interface MFR1, changed state to up
*Mar 1 00:22:55.219: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to up
*Mar 1 00:22:55.263: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access2, changed state to up
No complaints this time...
R7(config-if)#do ping 47.47.47.4
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 47.47.47.4, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/6/16 ms
R7(config-if)#do sh users
Line User Host(s) Idle Location
* 0 con 0 idle 00:00:00
Interface User Mode Idle Peer Address
Vi2 PPPoFR 00:01:06
Se1/0 Sync PPP 00:00:05
Se1/1 Sync PPP 00:00:05
Mu1 Sync PPP 00:00:54 47.47.47.4
Looks good so far, lets confirm what the multilink PPP interface thinks its bandwidth is (it should be 1544 * 2 for the direct PPP links and 512 for the MFR link)
R7(config-if)#do sh ppp multi
Multilink1
Bundle name: R4
Remote Endpoint Discriminator: [1] R4
Local Endpoint Discriminator: [1] R7
Bundle up for 00:24:11, total bandwidth 3344, load 1/255
Receive buffer limit 36000 bytes, frag timeout 1000 ms
0/0 fragments/bytes in reassembly list
0 lost fragments, 13 reordered
0/0 discarded fragments/bytes, 0 lost received
0x32 received sequence, 0x30 sent sequence
Member links: 3 active, 1 inactive (max not set, min not set)
Se1/0, since 00:24:06, 5790 weight, 1496 frag size
Se1/1, since 00:24:05, 5790 weight, 1496 frag size
Vi2, since 00:04:21, 960 weight, 950 frag size
Vt1 (inactive)
No inactive multilink interfaces
We can see that the multilink interface thinks it has 3344 kbps of bandwidth and not 3600.
R7#sh int virtual-access 2
Virtual-Access2 is up, line protocol is up
Hardware is Virtual Access interface
MTU 1500 bytes, BW 256 Kbit/sec, DLY 100000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation PPP, LCP Open, multilink Open
Link is a member of Multilink bundle Multilink1
PPPoFR vaccess, cloned from Virtual-Template1
Vaccess status 0x44
Bound to MFR1.47 DLCI 47, Cloned from Virtual-Template1, loopback not set
Keepalive set (10 sec)
DTR is pulsed for 5 seconds on reset
Last input 00:02:02, output never, output hang never
Last clearing of "show interface" counters 00:20:59
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
253 packets input, 5890 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
254 packets output, 5393 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 unknown protocol drops
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
Virtual-Access2 believes that there is 256kbps of bandwidth available rather than the expected 512kbps. Lets modify the bandwidth associated with Virtual-Template 1 (since the Virtual-Access interface inherits data from it) and see if that helps.
R7(config-if)#int virtual-template 1
R7(config-if)#bandwidth 512
R7(config-if)#int mfr1
R7(config-if)#shut
R7(config-if)#no shut
*Mar 1 00:40:48.283: %LINK-5-CHANGED: Interface MFR1, changed state to administratively down
*Mar 1 00:40:48.287: %LINK-3-UPDOWN: Interface Virtual-Access2, changed state to down
*Mar 1 00:40:49.295: %LINEPROTO-5-UPDOWN: Line protocol on Interface MFR1, changed state to down
*Mar 1 00:40:49.299: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access2, changed state to down
*Mar 1 00:40:49.647: %LINK-3-UPDOWN: Interface MFR1, changed state to down
*Mar 1 00:40:51.295: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, changed state to down
*Mar 1 00:40:51.299: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to down
*Mar 1 00:40:58.259: %LINK-3-UPDOWN: Interface MFR1, changed state to up
*Mar 1 00:40:58.311: %LINK-3-UPDOWN: Interface Virtual-Access2, changed state to up
*Mar 1 00:40:59.251: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, changed state to up
*Mar 1 00:40:59.259: %LINEPROTO-5-UPDOWN: Line protocol on Interface MFR1, changed state to up
*Mar 1 00:40:59.267: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to up
*Mar 1 00:40:59.311: %LINEPROTO-5-UPDOWN: Line protocol on Interface Virtual-Access2, changed state to up
R7(config-if)#do sh ppp multi
Multilink1
Bundle name: R4
Remote Endpoint Discriminator: [1] R4
Local Endpoint Discriminator: [1] R7
Bundle up for 00:32:49, total bandwidth 3600, load 1/255
Receive buffer limit 36000 bytes, frag timeout 1000 ms
0/0 fragments/bytes in reassembly list
0 lost fragments, 13 reordered
0/0 discarded fragments/bytes, 0 lost received
0x3A received sequence, 0x38 sent sequence
Member links: 3 active, 1 inactive (max not set, min not set)
Se1/0, since 00:32:44, 5790 weight, 1496 frag size
Se1/1, since 00:32:43, 5790 weight, 1496 frag size
Vi2, since 00:00:09, 1920 weight, 1496 frag size
Vt1 (inactive)
No inactive multilink interfaces
Okay, repeat the same thing on R4 and that should be it. Would anyone want to do this in the real world? I certainly hope not!
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