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High Availability Commands for CCNP BCMSN

Sample Chapter is provided courtesy of Cisco Press.
Date: Nov 30, 2007.

Chapter Information

Chapter Description

This chapter provides information on and commands for Hot Standby Routing Protocol, Virtual Router Redundancy Protocol, and Gateway Load Balancing Protocol.

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Virtual Router Redundancy Protocol

VRRP is an election protocol that dynamically assigns responsibility for one or more virtual routers to the VRRP routers on a LAN, allowing several routers on a multiaccess link to use the same virtual IP address. A VRRP router is configured to run VRRP in conjunction with one or more other routers attached.

Configuring VRRP

`Router(config)#` `interface fastethernet 0/0`	Moves to interface config mode
`Router(config-if)#` `ip address 172.16.100.5 255.255.255.0`	Assigns IP address and netmask
`Router(config-if)#` `vrrp 10 ip 172.16.100.1`	Enables VRRP for group 10 on this interface with a virtual address of 172.16.100.1. The group number can be from 1 to 255.
`Router(config-if)#` `vrrp 10 description Engineering Group`	Assigns a text description to the group
`Router(config-if)#` `vrrp 10 priority 110`	Sets the priority level for this router. The range is from 1 to 254. The default is 100.
`Router(config-if)#` `vrrp 10 preempt`	This router will preempt, or take over, as the virtual router master for group 10 if it has a higher priority than the current virtual router master
`Router(config-if)#` `vrrp 10 preempt delay minimum 60`	This router will preempt, but only after a delay of 60 seconds
	NOTE The default delay period is 0 seconds.
`Router(config-if)#` `vrrp 10 timers advertise 15`	Configures the interval between successful advertisements by the virtual router master
	NOTE The default interval value is 1 second.
	NOTE All routers in a VRRP group must use the same timer values. If routers have different timer values set, the VRRP group will not communicate with each other.
	NOTE The range of the advertisement timer is 1 to 255 seconds. If you use the msec argument, you change the timer to measure in milliseconds. The range in milliseconds is 50 to 999.
`Router(config-if)#` `vrrp 10 timers learn`	Configures the router, when acting as a virtual router backup, to learn the advertisement interval used by the virtual router master
`Router(config-if)#` `vrrp 10 shutdown`	Disables VRRP on the interface, but configuration is still retained
`Router(config-if)#` `no vrrp 10 shutdown`	Reenables the VRRP group using the previous configuration

Verifying VRRP

`Router#` `show running-config`	Displays contents of dynamic RAM
`Router#` `show vrrp`	Displays VRRP information
`Router#` `show vrrp brief`	Displays a brief status of all VRRP groups
`Router#` `show vrrp 10`	Displays detailed information about VRRP group 10
`Router#` `show vrrp interface fastethernet 0/0`	Displays information about VRRP as enabled on interface fastethernet 0/0
`Router#` `show vrrp interface fastethernet 0/0 brief`	Displays a brief summary about VRRP on interface fastethernet 0/0

Debugging VRRP

`Router#` `debug vrrp all`	Displays all VRRP messages
`Router#` `debug vrrp error`	Displays all VRRP error messages
`Router#` `debug vrrp events`	Displays all VRRP event messages
`Router#` `debug vrrp packets`	Displays messages about packets sent and received
`Router#` `debug vrrp state`	Displays messages about state transitions

3. Gateway Load Balancing Protocol | Next Section Previous Section

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