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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The default priority decrement value is See All Related Articles. An AVF with bigger weight value will get more traffic redirected to it. R1 config-if ip address You could only get any kind of load balancing if you add multiple groups. The default setting is This method is the default. 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.

Router-B show glbp brief. This address if entered must be in the same subnet as the interface IP address primary or secondary. Under some situations this approach could be the best option, for example in case of stateful NAT.

GLBP is supported by Cisco,,,series. For a virtual forwarder the state can be one of the following: About Affiliates Cisco Systems, Inc.

Cisco GLBP Configuration with Example | ICND2

The following two tabs change content below. R2 copy running-config startup-config. Each host is configured with the same virtual IP address, and all routers in the virtual router group participate in forwarding packets. For a virtual gateway the state can be one of the following: 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.

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This section will first go over the configuration process steps and commands that are used to perform a basic GLBP configuration. R2 config-if glbp 10 priority 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.

Specifies that GLBP will load balance using the host-dependent method. Gateway Load Balancing Protocol on the other hand, allows you to load balance within one group. R2 config-keychain-key key-string test-string.

Here is a sample output, similar to what we saw for HSRP. As you can see, each Client got different routes to reach 8. This is to ensure that R1 has the highest priority confiiguration the group members.

GLBP & GLBP Basic Configuration – Cisco & Cisco Network Hardware News and Technology

With this result, we can confirm that all AVFs has been used equally. There are all kinds of news and information related to Cisco and Cisco network equipment, such as release of Cisco equipment, news of Cisco’s new networking solution, and Cisco hardware and software upgrading Back to home page. With standard GLBP configuration as above, the default load-balancing algorithm that will be used is round-robin.

Router-A show glbp brief. Latest posts by Arranda Saputra see all. The object-number can be any number between 1 and R1 config-if ip address Host-dependent algorithm guarantees that the same gateway will always be used for a specific clientas long as there glpb no changes on the AVF number.


The redundancy scheme of GLBP enables you to preempt an active virtual gateway with a higher priority backup virtual gateway that has become available. Gateway Load Balancing Protocol.

Because of this, a number of different technologies have been developed to provide redundancy at every point within the network. Weighted algorithm distribute traffic to each AVF based on the weight value assigned to them.

This is a transitory state because a virtual forwarder changing to a disabled state is deleted.

Configure GLBP in Cisco IOS Router

If failure happens on the AVG, the role will be granted to another router with next highest priority. R1 config-if glbp 1 load-balancing weighted. The virtual MAC address is known but virtual forwarder configuration is not complete. Change the default GLBP load balancing behavior to using weighting. Have a look at the following sample topology: Forwarder preemption works in a similar way, except that configruation preemption uses weighting instead of priority and is enabled by default.

Because they didn’t have the foresight to call it HSRP. But there is far more intelligence baked into this technology, where when a client ARPs, short for Address Resolution Protocol, for it’s default gateway, one client could get one response, a different client would get a different response, because all of the routers are forwarding.