GLBP is a Cisco proprietary protocol that attempts to overcome the limitations of existing This section will first go over the configuration process steps and commands that are used to perform a basic GLBP configuration. An example. In the previous lesson we showed you a load balancing mechanism and I’ll still argue that that’s the best way to go. Gateway Load Balancing Protocol – GLBP is .

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Well for large volumes of traffic, it results in some pretty inefficient and potentially problematic traffic flow. This site is in not affiliated with Cisco Systems, Inc.

R1 config-if ip address Configures the router to preempt, or take over, as AVG for group 10 if this router has a higher priority than the current AVG. The default load balancing method for GLBP is round-robin.

R2 config-keychain-key key-string test-string. R1 config-if glbp 10 ip The group-number can be any value from 1 to R2 config-if glbp 1 track 1 decrement And there is a router that is responsible to say, hey here is your virtual MAC address, next one, here’s a different virtual MAC address. We configurration them active virtual forwarders, and there is a virtual MAC address that is tied to each of hlbp.


Configuration Example: GLBP > High Availability Commands for CCNP BCMSN

Configure GLBP to use the tracked object to influence its weighting. R2 config-if glbp 10 timers 5 It’s mission in life though is to dynamically distribute the load within a group. The key-number can be any number between Assuming the basic interface IP and routing has been pre-configured, the command to enable GLBP in each router is as follows. Specifies a load balancing method that is dependent. An AVF with bigger hlbp value will get more traffic redirected to it. R1 config-if glbp 1 track 1 decrement In this section, the configuration is extended to show basic GLBP authentication using key chains, altering the default load balancing behavior to weighting, and basic interface line protocol tracking.

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R1 config-if glbp 1 load-balancing weighted. The redirect-timer is the amount of time that passes before the AVG assumes that the forwarder is not going to return; the timeout is the amount of time until the virtual MAC address that was used by the failed AVF is no longer functional.

GLBP Configuration on Cisco

Create a tracked object. As previously explained, all routers in GLBP are actively forwarding packet. As you can see that the first two trace got redirected via R3, while each of the next two traces got redirected via R1 and R2 consecutively. As in the previous article, the higher priority tells it to be the active GLBP configudation.


Sets the priority level of the router. The following two tabs change content below. The difference here is that there will be load balancing occurring between the two routers. The load sharing available are: Above, you can see the active and standby routers as well as the virtual MAC addresses assigned to each One virtual forwarder within a GLBP group is elected as active virtual forwarder for a specified virtual MAC address, and is responsible for forwarding packets sent to that MAC address.

Have a look at the following xeample topology: Router with the highest priority number will be elected as the AVG. GLBP is supported by Cisco,,,series.

For a virtual forwarder the state can be one of the following: If we try traceroute via Client B or Client C we would probably got different gateway than Client A, but each client will keep redirected using the same gateway until there is a change on AVF number.