GLBP TUTORIAL PDF

The main disadvantage of HSRP and VRRP is that only one gateway is elected to be the active gateway and used to forward traffic whilst the rest are unused until the active one fails. In this tutorial, we will learn how GLBP works. The election is based on the priority of each gateway highest priority wins. If all of them have the same priority then the gateway with the highest real IP address becomes the AVG. 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 feature , R4 will be elected AVG because of its highest IP address In this case we only have four gateways so surely they are all elected AVFs.

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However, unlike its little brothers, GLBP is capable of using multiple physical gateways at the same time. If you have R1, R2, R3 sharing the segment The physical gateway priority settings will determine which physical gateway takes the role of the active packet forwarder. The hosts on the segment will set their default gateway to GLBP brings this idea to new level, by allowing multiple physical gateways to participate in packet forwarding simultaneously.

Considering the example above, imagine you need the hosts on the segments to fully utilize all existing physical gateways, yet provide recovery from a gateway failure. At the same time, you want to ensure, that hosts using either of the gateways will automatically switch to another if their gateway fails. On top of that, all hosts in the segment should reference to the virtual gateway using the same IP address This is a complicated task, which has being addressed by GLBP protocol design.

To begin with, we should recall that every host on the segment needs to resolve the virtual gateway IP address Here are the implementation details. The AVG will also implement load-sharing algorithm, e. You may configure AVG preemption, so that a newly configured router with highest priority value becomes AVG, preemption the old one. What about AVF redundancy? The weight value could be combined with object tracking to bring powerful traffic manipulation options. Next, with respect to redundancy, all AVFs backup each other.

At the same moment, two timers would start: Redirect and Secondary Hold. This is basically how GLBP works. Different load-balancing algorithms are supported — the default one is round robin, with options for weighted load balancing and source-MAC based. Type escape sequence to abort.

To summarize, GLBP is a virtual gateway protocol, with built-in load-balancing capabilities. Load balancing is based on manipulating ARP responses to the requests sent to the virtual gateway IP address. Petr Lapukhov has more than 12 years of experience working with Cisco Systems products. Petr works with all of the technologies covered within his four CCIE tracks on a daily basis, staying current with any changes in the industry.

He has also received his Cisco Certified Design Expert CCDE certification, joining a small group of distinguished individuals who have achieved this status.

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GLBP Configuration on Cisco Switch

Each host is configured with the same virtual IP address, and all routers in the virtual router group participate in forwarding packets. GLBP members communicate between each other through hello messages sent every 3 seconds to the multicast address But what happen if the AVG goes down? Sign in.

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In this tutorial, we are going to show you all the steps required to configure GLBP on a Cisco Switch using the command-line. Don't forget to subscribe to our youtube channel named FKIT. To access the console of a Cisco Switch model or , you will need to select the Serial Connection category and use the following options:. Using either the console, telnet or ssh, connect to the command-line of your switch and log in with a user who has administrative privileges.

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However, unlike its little brothers, GLBP is capable of using multiple physical gateways at the same time. If you have R1, R2, R3 sharing the segment The physical gateway priority settings will determine which physical gateway takes the role of the active packet forwarder. The hosts on the segment will set their default gateway to GLBP brings this idea to new level, by allowing multiple physical gateways to participate in packet forwarding simultaneously.

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