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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Back in the day when Configuratio was created, they only had one. An AVF with bigger weight value will get more traffic exqmple to it. Each host is configured with the same virtual IP address, and all routers in the virtual router group participate in forwarding packets. Figure 1 GLBP example topology. You can send me a message on LinkedIn or email to arranda. For a virtual forwarder the state can be one of the following: Subscribe to newsletter To be informed of the latest articles, subscribe:.

You can use a simple text password authentication scheme between GLBP group members to detect configuration errors. It seems pretty benign, right?

Configuring redundancy with GLBP | CiscoZine

The reason for this site is to help you with your Cisco certification by covering the essentials you need in order to pass the CCNA exams. The virtual MAC address is known but virtual forwarder configuration is not complete. This section covers a simple example of how GLBP can be configured in a basic common topology. Indicates that this gateway is the AVF, and that it is responsible for forwarding packets sent to the virtual forwarder MAC address.


First Hop Redundancy Protocol, that’s a gateway protocol.

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 exwmple time until the virtual MAC address that was used by the failed AVF is no longer functional. You could only get any kind of load balancing if you add multiple groups. I am IT practitioner in real life with specialization in network and server infrastructure.

Router-B show glbp brief. In this article, networking consultant Sean Wilkins takes the concepts covered in his earlier ” Introduction to GLBP ” article and discusses how those concepts can be configuratoin to real devices.

conifguration GLBP is far more complicated. 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. The line-protocol parameter will track the protocol state of the configured interface.

Configure GLBP in Cisco IOS Router

So we can see we’re active, virtual IP address but the reality is there is far more to it than what we can even get into in this discussion. R2 config-if glbp 1 track 1 decrement Page 1 of 1. Change the default GLBP load balancing behavior to using weighting. It’s the most advanced, but it can generate some traffic flow that is downright undesirable. Tables 2 and 3 show the basic commands that are required to configure GLBP between the two devices shown in Figure 1.


R2 config-if glbp 10 preempt. Virtual gateway is attempting to become the active or standby virtual gateway.

R2 config-if ip address See All Related Store Items. This is a transitory state because a virtual forwarder changing to a disabled state is deleted. 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. From the author of.

GLBP Configuration on Cisco ⋆

The default load balancing method for GLBP is round-robin. The expectation of full-time connectivity has certainly gotten considerably higher over the last decade.

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.

So the configuration commands are standby, the show commands are standby and that’s really annoying.

In GLBP, all routers are efficiently utilized to forward packets, so in addition to redundancy we also get load balancing. Related Resources Store Articles Blogs. A router within a GLBP group with a different authentication string than other routers will be ignored by other group members.

Specifies a load balancing method based on the MAC address of a host where the same forwarder is always used for a particular hlbp while the number of GLBP group members remains unchanged.