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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Here instead of standby, we see GLBP. One virtual gateway within a GLBP group is elected as the active virtual gateway, and is responsible for the operation of the protocol.

Because what can happen is traffic can go up to the distribution layer and then get forwarded exampe the distribution layer link to the other router. R2 copy running-config startup-config. Related Resources Store Articles Blogs. The key-number can be any number between R1 config-if glbp 10 load-balancing host-dependent.

On the other hand, we give R1 priorityR2 priorityand R3 with default priority See Tables configurztion and 6 for examples.

Configure GLBP in Cisco IOS Router

Table 4 covers all the commands that are required to perform these steps. Enter the key string that will be used to authenticate with neighboring devices. I have years of experience in design, analysis, operation, and optimization of infrastructure solutions for enterprise-scaled network. For a virtual gateway the state can configuratuon one of the following: Configures the hello timer to be set to 5 seconds and the hold timer to be 18 seconds. The next two trace would probably go through R3 again, because R3 has twice the weight of each R1 and R2.

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

With GLBP, we can effectively utilize all our routers as the gateway with several different algorithm that we can choose based on our needs. This router has the highest priority value, or the highest IP address in the group, if there is eaxmple highest priority.

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

This site is in not affiliated with Cisco Systems, Inc. Different interfaces can be tracked to decrement the GLBP weighting by varying amounts. R1 config-keychain-key key-string test-string. R2 config-if glbp 10 preempt. GLBP Figure shows the network topology for the configuration that follows, which shows how to configure GLBP using commands covered in this chapter.

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. Virtual gateway is attempting to become the active or standby virtual gateway.

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.

This is to ensure that R1 has the highest priority among the group members. I hope that this article provided some insight into the configuration steps that are required to configure GLBP and get it up and running. In the previous lesson we showed you a load balancing mechanism and I’ll still argue that that’s the best way to go.


As one of these, FHRPs are used to provide redundancy; which one you use depends on the specific deployment and the vendors that will be used within the target network.

If a key-chain is configured with the command above, follow these next few steps to create the key-chain. R1 config-if glbp 10 priority Router config hostname R2. Create a key chain using the name testchain configguration enter into key chain configuration mode.

It’s the most advanced, but it can generate some traffic flow that is downright undesirable. R1 config-if glbp 1 load-balancing weighted.

Assuming the basic interface IP and routing has been pre-configured, the command to enable GLBP in each router is as follows.

You still have fail over configuratjon the way, you still have fail over, but we get load balancing baked into this technology. See All Related Store Items. R2 config-if no shutdown. Because of this, a number of different technologies have been developed to provide redundancy at every point within the network.

GLBP (Gateway Load Balancing Protocol) |

Note that only the commands specific to GLBP are shown in this example. These include GLBP configuraiton helloholdredirect and timeoutaltering the default load balancing behavior the default is round robinconfiguring GLBP authentication, and basic interface tracking.

R2 config-if glbp 1 authentication key-chain testchain.

It seems pretty benign, right? The default setting is Indicates that the virtual MAC address has not been assigned or learned.