Cisco Networks by Chris Carthern William Wilson Richard Bedwell & Noel Rivera

Author:Chris Carthern, William Wilson, Richard Bedwell & Noel Rivera
Language: eng
Format: epub
Publisher: Apress, Berkeley, CA

Exercise 2

IOU2 Configuration

IOU2(config)#Int e0/0

IOU2(config-if)#Ip add 192.168.5.2 255.255.255.0

IOU2(config-if)#Vrrp 40 ip 192.168.5.1

IOU2(config-if)#Vrrp 40 priority 110

IOU2(config-if)#Vrrp 40 preempt

IOU2(config-if)#vrrp 40 track 1 decrement 15

IOU2(config-if)#Vrrp 40 authentication md5 key-string test

IOU2(config-if)#exit

IOU2(config)#track 1 interface ethernet 0/1 line-protocol

You know that IOU2 must be the active VIP. You configured IOU2 with a priority of 110 and a track decrement of 15, which means the priority of IOU3 must be between 96 and 109. The VRRP group is 40, as in the diagram, and the VIP is 192.168.5.1.

IOU3 Configuration

IOU3(config)#int e0/0

IOU3(config-if)#Ip add 192.168.5.3 255.255.255.0

IOU3(config-if)#Vrrp 40 ip 192.168.5.1

IOU3(config-if)#Vrrp 40 priority 105

IOU3(config-if)#Vrrp 40 preempt

IOU3(config-if)#vrrp 40 track 1 decrement 15

IOU3(config-if)#Vrrp 40 authentication md5 key-string test

IOU3(config-if)#exit

IOU3(config)#track 1 interface ethernet 0/1 line-protocol

IOU3 was created with a priority of 105 and uses the preempt command, so that if the ISP-facing interface drops on IOU2, IOU3 becomes the master. Now you run a show vrrp brief on both IOU2 and IOU3 to verify that IOU2 is the master.

IOU2#sh vrrp brief

Interface Grp Pri Time Own Pre State Master addr Group addr

Et0/0 40 110 3570 Y Master 192.168.5.2 192.168.5.1

Now you shut down the ISP-facing interface on IOU2, and verify that IOU2 becomes the backup.

IOU2(config-if)#int e0/1

IOU2(config-if)#shut

*Mar 11 23:29:48.369: %VRRP-6-STATECHANGE: Et0/0 Grp 40 state Master -> Backup

IOU2#sh vrrp brief

Interface Grp Pri Time Own Pre State Master addr Group addr

Et0/0 40 95 3570 Y Backup 192.168.5.3 192.168.5.1

You have verified that IOU2 was the master router until you shut down interface e0/1, and then IOU3 became the master router.

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