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High Availability Commands for CCNP BCMSN

Nov 30, 2007

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Configuration Example: GLBP

Figure 5-2 shows the network topology for the configuration that follows, which shows how to configure GLBP using commands covered in this chapter. Note that only the commands specific to GLBP are shown in this example.

Figure 5-2 Network Topology for GLBP Configuration Example

R1 is the AVG for a GLBP group and is responsible for the virtual IP address 10.21.8.10. R1 is also an AVF for the virtual MAC address 0007.b400.0101. R1 is a member of the same GLBP group and is designated as the AVF for the virtual MAC address 0007.b400.0102.

WS1 has a default gateway IP address of 10.21.8.10 and a gateway MAC address of 0007.b400.0101.

WS2 shares the same default gateway IP address but receives the gateway MAC address 0007.b400.0102 because R2 is sharing the traffic load with R1.

Router 1

`Router>` `enable`	Moves to privileged mode
`Router#` `configure terminal`	Moves to global config mode
`Router(config)#` `hostname R1`	Assigns router name
`R1(config)#` `interface fastethernet 0/0`	Moves to interface config mode
`R1(config-if)#` `ip address 172.16.16.5 255.255.255.0`	Assigns IP address and netmask
`R1(config-if)#` `glbp 10 ip 172.16.16.254`	Enables GLBP for group 10 on this interface with a virtual address of 172.16.16.254
`R1(config-if)#` `glbp 10 preempt`	Configures the router to preempt, or take over, as AVG for group 10 if this router has a higher priority than the current AVG
`R1(config-if)#` `glbp 10 priority 250`	Sets the priority level of the router
`R1(config-if)#` `glbp 10 timers 5 18`	Configures the hello timer to be set to 5 seconds and the hold timer to be 18 seconds
`R1(config-if)#` `glbp 10 load-balancing host-dependent`	Specifies that GLBP will load balance using the host-dependent method
`R1(config-if)#` `no shutdown`	Enables the interface
`R1(config-if)#` `exit`	Returns to global config mode
`R1(config)#` `exit`	Returns to privileged mode
`R1#` `copy running-config startup-config`	Saves the configuration to NVRAM

Router 2

`Router>` `enable`	Moves to privileged mode
`Router#` `configure terminal`	Moves to global config mode
`Router(config)#` `hostname R2`	Assigns router name
`R2(config)#` `interface fastethernet 0/0`	Moves to interface config mode
`R2(config-if)#` `ip address 172.16.16.6 255.255.255.0`	Assigns IP address and netmask
`R2(config-if)#` `glpb 10 ip 172.16.16.254`	Enables GLBP for group 10 on this interface with a virtual address of 172.16.16.254
`R2(config-if)#` `glbp 10 preempt`	Configures the router to preempt, or take over, as AVG for group 10 if this router has a higher priority than the current AVG
`R2(config-if)#` `glbp 10 priority 100`	Sets the priority level of the router. The default setting is 100.
`R2(config-if)#` `glbp 10 timers 5 18`	Configures the hello timer to be set to 5 seconds and the hold timer to be 18 seconds
`R1(config-if)#` `glbp 10 load-balancing host-dependent`	Specifies that GLBP will load balance using the host-dependent method
`R2(config-if)#` `no shutdown`	Enables the interface
`R2(config-if)#` `exit`	Returns to global config mode
`R2(config)#` `exit`	Returns to privileged mode
`R2#` `copy running-config startup-config`	Saves the configuration to NVRAM

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