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 The group-number can be any value coonfiguration 1 to It seems pretty benign, right? This address if entered must be in the same subnet as the interface IP address primary or secondary. So they didn’t actually bake that into the names of all the commands. The difference here is that there will be load balancing occurring between the two routers.

GLBP (Gateway Load Balancing Protocol) |

The load sharing available are: 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. You can use a simple text password authentication scheme between GLBP group members to detect configuration errors.

An AVF ezample bigger weight value will get more traffic redirected to it. 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.

The next two trace would probably go through R3 again, because R3 has twice the weight of each R1 and R2. Indicates that this gateway is the AVF, and that it is responsible for forwarding packets sent to the virtual forwarder MAC address. R2 config-if glbp 10 priority For a virtual gateway the state can be one of the following: Which MAC address it returns depends on which load-balancing algorithm it is configured to use.


Back to home page. How configuratio this happen? You might also like: Subscribe to newsletter To be informed of the latest exmaple, subscribe:.

GLBP is supported by Cisco,,,series. Sample Chapter is gllbp courtesy of Cisco Press. 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 applied to real devices.

R1 config-if glbp 1 track 1 decrement We call them active virtual forwarders, and there is a virtual MAC address that is tied to each of them. The virtual MAC address is known but virtual forwarder configuration is not complete.

Cisco Gateway Load Balance Protocol (GLBP) Configuration Process and Commands

Above, you can see the active and standby routers as well as the virtual MAC addresses assigned to each Specifies that GLBP will load balance using the host-dependent method. An example will then be shown on how these steps can be used to configure GLBP in a sample networking topology.

The following two tabs change content below. I hope that this article provided some insight into the configuration steps that are required to configure GLBP and get it up and running. Specifies a load balancing method based on the MAC address of a host where the same forwarder is always used for a particular host while the number of GLBP group members remains unchanged.

You could only get any kind of load balancing if you add multiple groups. In the previous lesson we showed you a load balancing mechanism and I’ll still argue that that’s the best way to go.

With this result, we can confirm that all AVFs has been used equally. R2 config-if ip address See Tables 5 and 6 for examples.


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. And it could have done this because spanning tree led us one way and we need to go another.

Configures the router to preempt, or take over, as AVG for group 10 if this router has a higher priority than the current AVG. R2 config-if no shutdown. Enter the key string that will be used to authenticate with neighboring devices. Configure GLBP to use the tracked object to influence its weighting. Change the default GLBP load balancing behavior to using weighting.

About Affiliates Cisco Systems, Inc. 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. Create and enter into key chain — key configuration mode using a key number of 1.

The main difference is that GLBP allows for load balancing between the two routers rather than using just one and leaving the other unused until needed. Enables GLBP for group 10 on this interface with a virtual address of So we can see we’re configuraiton, virtual IP address but the reality is there is far more to it than what we can even get into in this discussion.

The key-number can be any number between See All Related Articles. Table 4 covers all the commands that are required to perform these steps.