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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An AVF with bigger weight value will get more traffic redirected to it. Different interfaces can be tracked to decrement the GLBP weighting by varying amounts. Indicates that the gateway is next in line to be the active virtual gateway AVG. Configure GLBP to use the tracked object to influence its weighting.

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. Subscribe to newsletter To be informed of the latest articles, subscribe:. Follow us Subscribe to the RSS feed http: Gateway Load Balancing Protocol on the other hand, allows you to load balance within one group.

How does this happen? This is to ensure that R1 has the highest priority among the group members.

With standard GLBP configuration as above, the default load-balancing algorithm that will be used is round-robin. R1 config-if ip address This is all done transparently to the end user.

Configuration Example: GLBP > High Availability Commands for CCNP BCMSN

GLBP is supported by Cisco,,,series. GLBP preemption is disabled by default. So the configuration commands are standby, the show commands are standby and that’s really annoying. R1 config-if glbp 10 priority Here is a sample output, similar to what we saw for HSRP. Router-A show glbp brief. We call them active virtual forwarders, and there is a virtual MAC address that is tied to each of them. You can use a simple text password authentication scheme between GLBP group members to detect configuratuon errors.


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

Virtual gateway is attempting to become the active or standby virtual gateway. Enter the key string that will be used to authenticate with neighboring devices. It’s the most advanced, but it can generate some traffic flow that is downright undesirable.

Have a look at the following sample topology: Note that only the commands specific to GLBP are shown in this example. So we can see we’re active, virtual IP address but the reality is there is far more to it than what gblp can even get into in this discussion. Because they didn’t have the foresight to call it HSRP. See All Related Store Dxample.

In our test, we tried traceroute to cloud loopback IP 8. This site is in not affiliated with Cisco Systems, Inc. Change the default GLBP load balancing behavior to using weighting.

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.

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

Configure GLBP in Cisco IOS Router

In this section, the commands that are covered will extend to those that modify the default behavior of the GLBP process. The line-protocol parameter will track the flbp state of the configured interface. About Affiliates Cisco Systems, Inc.


The virtual MAC address is known but examplr forwarder configuration is not complete. One virtual gateway within a GLBP group is elected as the active virtual gateway, and is responsible for the operation of the protocol.

R1 config-if glbp 10 timers 5 Because of this, a number of different technologies have been developed to provide redundancy at every point within the network.

The load sharing available are: The following two tabs change content below. This is a transitory state because a virtual forwarder changing to a disabled state is deleted. The default load balancing method for GLBP is round-robin. 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.

Configures the hello timer to be set to 5 seconds and the hold timer to be 18 seconds. Cobfiguration shows the network topology for the configuration that follows, which shows how to configure GLBP using commands covered in this chapter. GLBP Figure shows the network topology for the configuration that follows, which shows how to configure GLBP using commands covered in this chapter.

R1 config-if glbp 10 ip An interface must be up and configured to route Cobfiguration, an interface IP address must be configured, and the virtual IP address must be known. I’ll tell you the reality though and the reality is this.

You still have fail over by the way, you still have fail over, but we get load balancing baked into this technology.