EIGRP metric manipulation

September 4th, 2008 Wael Osama Posted in EIGRP No Comments »

EIGRP is the most complex metric between all routing protocols metrics, in this post we are trying to clear the calculation of this metric as much as possible. Lets begin.. EGIRP metric is a composite metric made up of 5 parameters listed as follows: Bandwidth. Delay. Load. Reliability. MTU. All these parameters are used to [...]

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EIGRP timers (hello, hold-down and active)

August 30th, 2008 Wael Osama Posted in EIGRP 7 Comments »

Today at work I have run into troubleshooting an EIGRP problem with one of our customers; while troubleshooting this problem I started making every optimization I know about EIGRP. In this post I am sharing with you EIGRP timers I adjusted in order to clear up the problem. Hello interval timer: Hello interval is the [...]

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Passive-interface command behavior in RIP, EIGRP & OSPF

July 12th, 2008 Wael Osama Posted in EIGRP, IGP, OSPF, RIP 21 Comments »

Passive-interface command is used in all routing protocols to disable sending updates out from a specific interface. However the command behavior varies from o­ne protocol to another. In RIP this command will disable sending multicast updates via a specific interface but will allow listening to incoming updates from other RIP speaking neighbors. This simply means [...]

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Automatic summarization in RIP and EIGRP

July 10th, 2008 Wael Osama Posted in EIGRP, IGP, RIP, Routing 2 Comments »

Summarization in RIP and EIGRP can be configured manually using the ip summary-address command or automatically using auto-summary command. when auto summarization is in effect routers behave as shown in the steps below: Subnets are summarized to their classful boundary before being sent to neighbors if they are not part of the major subnet of [...]

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