This lab to show if we have 2 links with the same source and destination where one only using Serial and another using Frame Relay. We want the frame relay is as the main. Then if frame relay down, the backup will take over the traffic
R1#
interface Serial0/0
no ip address
encapsulation frame-relay
interface Serial0/0.1 point-to-point
backup interface Serial0/1
ip address 12.12.12.1 255.255.255.0
frame-relay interface-dlci 102
class KEEP_ALIVE
interface Serial0/1
ip address 21.21.21.1 255.255.255.0
router eigrp 1
network 0.0.0.0
auto-summary
map-class frame-relay KEEP_ALIVE
frame-relay end-to-end keepalive mode bidirectional
R2#
interface Serial0/0
no ip address
encapsulation frame-relay
no frame-relay inverse-arp
interface Serial0/0.1 point-to-point
ip address 12.12.12.2 255.255.255.0
frame-relay interface-dlci 201
class KEEP_ALIVE
interface Serial0/1
ip address 21.21.21.2 255.255.255.0
router eigrp 1
network 0.0.0.0
auto-summary
map-class frame-relay KEEP_ALIVE
frame-relay end-to-end keepalive mode bidirectional
Check frame keep alive
R1#sh fram end keepaliv
End-to-end Keepalive Statistics for Interface Serial0/0 (Frame Relay DTE)
DLCI = 102, DLCI USAGE = LOCAL, VC STATUS = ACTIVE (EEK UP)
SEND SIDE STATISTICS
Send Sequence Number: 52, Receive Sequence Number: 53
Configured Event Window: 3, Configured Error Threshold: 2
Total Observed Events: 55, Total Observed Errors: 0
Monitored Events: 3, Monitored Errors: 0
Successive Successes: 3, End-to-end VC Status: UP
RECEIVE SIDE STATISTICS
Send Sequence Number: 53, Receive Sequence Number: 52
Configured Event Window: 3, Configured Error Threshold: 2
Total Observed Events: 54, Total Observed Errors: 0
Monitored Events: 3, Monitored Errors: 0
Successive Successes: 3, End-to-end VC Status: UP
R1#sh int des
Interface Status Protocol Description
Fa0/0 admin down down
Se0/0 up up
Se0/0.1 up up
Fa0/1 admin down down
Se0/1 standby mode down
R1#sh ip int brie
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 unassigned YES NVRAM administratively down down
Serial0/0 unassigned YES NVRAM up up
Serial0/0.1 12.12.12.1 YES NVRAM up up
FastEthernet0/1 unassigned YES NVRAM administratively down down
Serial0/1 21.21.21.1 YES NVRAM standby mode down
R2#sh fram end keep
End-to-end Keepalive Statistics for Interface Serial0/0 (Frame Relay DTE)
DLCI = 201, DLCI USAGE = LOCAL, VC STATUS = ACTIVE (EEK UP)
SEND SIDE STATISTICS
Send Sequence Number: 65, Receive Sequence Number: 66
Configured Event Window: 3, Configured Error Threshold: 2
Total Observed Events: 68, Total Observed Errors: 0
Monitored Events: 3, Monitored Errors: 0
Successive Successes: 3, End-to-end VC Status: UP
RECEIVE SIDE STATISTICS
Send Sequence Number: 66, Receive Sequence Number: 65
Configured Event Window: 3, Configured Error Threshold: 2
Total Observed Events: 68, Total Observed Errors: 0
Monitored Events: 3, Monitored Errors: 0
Successive Successes: 3, End-to-end VC Status: UP
R2#sh int des
Interface Status Protocol Description
Fa0/0 admin down down
Se0/0 up up
Se0/0.1 up up
Fa0/1 admin down down
Se0/1 up down
R2#sh ip int bri
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 unassigned YES NVRAM administratively down down
Serial0/0 unassigned YES NVRAM up up
Serial0/0.1 12.12.12.2 YES NVRAM up up
FastEthernet0/1 unassigned YES NVRAM administratively down down
Serial0/1 21.21.21.2 YES NVRAM up down
Let’s test is the backup work! Do shutdown interface s0/0 in R2
R2(config)#int s0/0
R2(config-if)#shut
R2(config-if)#
*Mar 1 00:15:07.311: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 12.12.12.1 (Serial0/0.1) is down: interface down
*Mar 1 00:15:09.283: %LINK-5-CHANGED: Interface Serial0/0, changed state to administratively down
*Mar 1 00:15:10.283: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to down
Wait a second the backup interface will going to up!
R2#
*Mar 1 00:15:47.503: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, changed state to up
*Mar 1 00:15:47.959: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 21.21.21.1 (Serial0/1) is up: new adjacency
R1#
*Mar 1 00:15:17.035: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 12.12.12.2 (Serial0/0.1) is down: holding time expired
*Mar 1 00:15:29.563: %FR_EEK-5-FAILED: Interface Serial0/0.1 - DLCI 102
In R1, int s0/1 will going to up as before the status is standby mode
*Mar 1 00:15:31.971: %LINK-3-UPDOWN: Interface Serial0/1, changed state to up
*Mar 1 00:15:32.979: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, changed state to up
*Mar 1 00:15:46.991: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 1: Neighbor 21.21.21.2 (Serial0/1) is up: new adjacency
R1#sh fram end keepaliv
End-to-end Keepalive Statistics for Interface Serial0/0 (Frame Relay DTE)
DLCI = 102, DLCI USAGE = LOCAL, VC STATUS = ACTIVE (EEK DOWN)
SEND SIDE STATISTICS
Send Sequence Number: 100, Receive Sequence Number: 84
Configured Event Window: 3, Configured Error Threshold: 2
Total Observed Events: 102, Total Observed Errors: 16
Monitored Events: 3, Monitored Errors: 3
Successive Successes: 0, End-to-end VC Status: DOWN
RECEIVE SIDE STATISTICS
Send Sequence Number: 84, Receive Sequence Number: 83
Configured Event Window: 3, Configured Error Threshold: 2
Total Observed Events: 96, Total Observed Errors: 11
Monitored Events: 3, Monitored Errors: 3
Successive Successes: 0, End-to-end VC Status: DOWN
Failures Since Started: 1, Last Failure: 00:02:29
R1#sh ip int brie
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 unassigned YES NVRAM administratively down down
Serial0/0 unassigned YES NVRAM up up
Serial0/0.1 12.12.12.1 YES NVRAM down down
FastEthernet0/1 unassigned YES NVRAM administratively down down
Serial0/1 21.21.21.1 YES NVRAM up up
R2#sh fram end keep
End-to-end Keepalive Statistics for Interface Serial0/0 (Frame Relay DTE)
R2#sh ip int bri
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 unassigned YES NVRAM administratively down down
Serial0/0 unassigned YES NVRAM administratively down down
Serial0/0.1 12.12.12.2 YES NVRAM administratively down down
FastEthernet0/1 unassigned YES NVRAM administratively down down
Serial0/1 21.21.21.2 YES NVRAM up up
Without this, the backup interface will be still in standby mode!
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