GLBP CONFIGURATION EXAMPLE PDF

The next three sections explain three of these options: standby preempt, message timers, and interface tracking. Preempt Moves to interface configuration mode Router config-if standby 1 preempt This router will preempt, or take control of, the active router if the local priority is higher than the active router Router config-if standby 1 preempt delay minimum Causes the local router to postpone taking over as the active router for seconds since that router was last restarted Router config-if standby 1 preempt delay reload Allows for preemption to occur only after a router reloads Router config-if no standby 1 preempt delay reload Disables the preemption delay, but preemption itself is still enabled. Use the no standby x preempt command to eliminate preemption NOTE If the preempt argument is not configured, the local router assumes control as the active router only if the local router receives information indicating that there is no router currently in the active state. HSRP Message Timers Moves to interface config mode Router config-if standby 1 timers 5 15 Sets the hello timer to 5 seconds and sets the hold timer to 15 seconds NOTE The hold timer is normally set to be greater than or equal to 3 times the hello timer. NOTE The hello timer can be from 1 to ; the default is 3.

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The next three sections explain three of these options: standby preempt, message timers, and interface tracking. Preempt Moves to interface configuration mode Router config-if standby 1 preempt This router will preempt, or take control of, the active router if the local priority is higher than the active router Router config-if standby 1 preempt delay minimum Causes the local router to postpone taking over as the active router for seconds since that router was last restarted Router config-if standby 1 preempt delay reload Allows for preemption to occur only after a router reloads Router config-if no standby 1 preempt delay reload Disables the preemption delay, but preemption itself is still enabled.

Use the no standby x preempt command to eliminate preemption NOTE If the preempt argument is not configured, the local router assumes control as the active router only if the local router receives information indicating that there is no router currently in the active state.

HSRP Message Timers Moves to interface config mode Router config-if standby 1 timers 5 15 Sets the hello timer to 5 seconds and sets the hold timer to 15 seconds NOTE The hold timer is normally set to be greater than or equal to 3 times the hello timer. NOTE The hello timer can be from 1 to ; the default is 3.

The hold timer can be from 1 to ; the default is The default unit of time is seconds. Router config-if standby 1 timers msec msec Sets the hello timer to milliseconds and sets the hold timer to milliseconds NOTE If the msec argument is used, the timers can be an integer from 15 to NOTE The default value of the track argument is TIP The track argument does not assign a new priority if the tracked interface goes down. The track argument assigns a value that the priority will be decreased if the tracked interface goes down.

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GLBP (Gateway Load Balancing Protocol)

Multiple first-hop devices on the LAN combine to offer a single virtual first-hop IP device while sharing the IP packet forwarding load. One member is elected to be the active device to forward packets sent to the virtual IP address for the group. The other devices in the group are redundant until the active device fails. These standby devices have unused bandwidth that the protocol is not using. Although multiple virtual device groups can be configured for the same set of devices, the hosts must be configured for different default gateways, which results in an extra administrative burden.

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Multiple first hop routers on the LAN combine to offer a single virtual first hop IP router while sharing the IP packet forwarding load. One member is elected to be the active router to forward packets sent to the virtual IP address for the group. The other routers in the group are redundant until the active router fails. These standby routers have unused bandwidth that the protocol is not using. Although multiple virtual router groups can be configured for the same set of routers, the hosts must be configured for different default gateways, which results in an extra administrative burden. Each host is configured with the same virtual IP address, and all routers in the virtual router group participate in forwarding packets. GLBP members communicate between each other through hello messages sent every 3 seconds to the multicast address

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