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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Comment on this post. You still have fail over by the way, you still have fail over, but we get load balancing baked into this technology. GLBP is a workable technology.

Configure GLBP in Cisco IOS Router

So the configuration commands are standby, the show commands are standby and that’s really annoying. 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 line-protocol parameter will track the protocol state of the configured interface. A router within confgiuration GLBP group with a different authentication string than other routers will be ignored by other group members.

Assuming the basic interface IP and routing has been pre-configured, the command to enable GLBP in each router is as follows. R2 config-if ip address In the previous lesson we showed you a load balancing mechanism and I’ll still argue that that’s the best way to go. Create a tracked object. Feel free to contact us if you have any further questions or concerns. See All Related Articles.

Router-A show glbp brief.

Subscribe to newsletter To be informed of the latest articles, configuratlon. An AVF with bigger weight value will get more traffic redirected to it. An example will then be shown on how these steps can be used to configure GLBP in a sample networking topology.


See Tables 5 and 6 for examples.

I’ll tell you the reality though and the reality is this. Forwarder preemption works in a similar way, except that forwarder preemption uses weighting instead of priority and is enabled by default.

R2 copy running-config startup-config. Back in the day when HSRP was created, they only had one.

R1 config-if glbp 1 authentication key-chain testchain. Enter the key string that will be used to authenticate with glb devices. 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 10 timers 5 First Hop Redundancy Protocol, that’s a gateway protocol. 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.

Cisco GLBP Configuration with Example | ICND2

R2 config-if glbp 1 authentication key-chain testchain. Create and enter into key chain — key configuration mode using a key number of 1. R1 config-if glbp 10 timers 5 Each host is configured with the same virtual IP address, and all routers in the virtual router group participate in forwarding packets. Router config hostname R1. How does this happen? R1 config-if configuratiob address With this configuration, R1 will always the first priority to become AVG. And it could have done this because spanning tree led us one way and we need to go another.

These include GLBP timers helloholdredirect and timeoutaltering the default load balancing behavior the default is round robinconfiguring GLBP authentication, and basic interface tracking. Configures the hello timer to be set to 5 seconds and the hold timer to be 18 seconds. Which MAC address it returns depends on which load-balancing algorithm coniguration is configured to use. In this section, the commands that are covered will extend to those that modify the default behavior of the GLBP process.


An interface must be up and configured to route IP, an interface IP address must be configured, and the virtual IP address must be known. Table 4 covers all the commands that are lgbp to perform these steps. From the author of. I hope that this article provided some insight into the configuration steps that are required to configure GLBP and get it up and running. Different interfaces can be tracked to decrement the GLBP weighting by varying amounts. The virtual MAC address is known but virtual forwarder configuration is not complete.

R2 config-if no shutdown.

With GLBP, we can effectively utilize all our routers as the gateway with several different algorithm that we can choose based on our needs. Figure 1 GLBP example topology.

You could only get any kind of load balancing if you add multiple groups. This is a transitory state because a virtual forwarder changing to a disabled state is deleted. 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. R2 config-keychain-key key-string test-string. GLBP members communicate between each other through hello messages sent every 3 seconds to the multicast address The load sharing available are: