Cisco How-To Tutorials The Gateway Load Balancing Protocol (GLBP) feature was integrated into Cisco IOS Software Release (15)T. There are two methods a LAN host can determine its default gateway or first-hop router. The first method uses a dynamic process such as a. GLBP is a Cisco proprietary protocol which was made available in . I’ve been following your two previous tutorials on HSRP and VRRP.

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CCNA Training » Gateway Load Balancing Protocol GLBP Tutorial

The default priority decrement value is This section will first go over the configuration process steps and commands that are used to perform a basic GLBP configuration. R2 configure terminal Enter configuration commands, one per line.

R2 config-if ip address Related Resources Store Articles Blogs. I need latest dumps please. You may disable preemption by using the no vrrp preempt command interface configuration mode.

Change the default GLBP load balancing behavior to using weighting. For example in the topology above suppose all of the gateways have the same priority and GLBP is turned on at the same time on all gateways or they are configured with the preempt featureR4 will be elected AVG because of its highest IP address R1 configure terminal Enter configuration commands, one per line.

The default VRRP priority is also though tutprial we configured it manually just for the sake of demonstration. This transition is transparent for the hosts. R1 config-if glbp 1 load-balancing weighted. If the router R1 becomes unavailable, the backup with higher priority, that is R2should assume the role of master.

The output of show vrrp on R2 below shows that it is a virtual router backup having priority R2 config-if glbp 1 authentication key-chain testchain. Enter the key string that will be tutoril to authenticate with neighboring devices.


R1 config-if glbp 1 authentication key-chain testchain. This section covers a simple example of how GLBP can be configured in a basic common topology. But only one member of the group is elected as the active router that forwards packets sent to the virtual IP address for the group. 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.

With this method, the same keys are configured on both ends. You may verify GLBP configuration and find out which role each router is playing using the show glbp command.

The expectation of full-time connectivity has certainly gotten considerably higher over the last decade. The main drawback of dynamic discovery protocols is that they require some configuration and processing on the host, which must participate in the dynamic process. The advantage of GLBP is that it provides load balancing in addition to redundancy without requiring configuration of different default gateways on different clients. But the trick here is it does not always give the same answer to that question: Syslog Tutorial Access list Sim 1 Simulator.

Maybe you glnp a question to ask here. 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 of time until the virtual MAC address that was used by the failed AVF is no longer functional.

The result of this would be R2 becoming the glbo while R3 staying as backup, as indicated by the output of show vrrp command on R2 and Tutodial. If one group fails, we must reconfigure the default gateways on the hosts, which results in tutorixl administrative burden.


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

One end will send the encrypted key called hash, using MD5 to the other. If preemption is disabled, the virtual router backup that is elected to become virtual router master remains the master until the original virtual router master comes back online and becomes master again. If there are multiple routers acting as virtual router backup, the one with the highest priority becomes the virtual router master tutoial the original virtual router master fails.

You can see from the output for R1 below that it is the active router.

14-1 High Availability – VRRP, HSRP, GLBP

The object-number can be any number between 1 and Find out more or Sign In. A given host always uses the same router. Load balancing algorithm GLBP load sharing is done in one of three ways: VRRP router preemption allows a virtual router backup with a higher priority that comes up to take over the virtual router backup that was elected to become the virtual router master.

If a key-chain is configured with the command above, follow these next few steps to create the key-chain.

Ramonarimi at gmail dot com. R2 config-if glbp 1 load-balancing weighted. The key for the MD5 hash can either be given directly in the configuration using a key string or supplied indirectly through a key chain. See Tables 5 and 6 for examples. And load balancing is achieved!