Multiple ASes

Answered Question
May 20th, 2007

Hi everybody,

As i read that EIGRP supports Multiple ASes on a single router but i don't understand this sentence .. so can any one help me to understand it .

And i want to understand how EIGRP redistribute with IGRP the routes...

Regards,

Ibrahim ALwahidi

I have this problem too.
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Correct Answer by mohammedmahmoud about 9 years 6 months ago

Hi,

EIGRP multiple ASs are used in designs when it is required to partition your AS, into smaller parts for design consideration, a single EIGRP process is analogous to an area of a link-state protocol. Multiple routing processes can be configured to achieve a hierarchy.

You can configure more than one EIGRP autonomous system on the same router, but Cisco does not recommend it. Multiple EIGRP autonomous systems on the same router that use mutual redistribution can cause discrepancies in the EIGRP topology table. Cisco recommends you configure only one EIGRP autonomous system in any single autonomous system.

HTH, please do rate all helpful replies,

Mohammed Mahmoud.

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mohammedmahmoud Sun, 05/20/2007 - 10:24

Hi Ibrahim,

EIGRP supports multiple AS --> You can run multiple EIGRP process using different AS number for each process (up to 30 per a single router) - The process ID or the AS may be any number between 1 and 65535.

Automatic redistribution occurs between EIGRP and IGRP within the same autonomous system - if both have the same AS.

HTH, please do rate all helpful replies,

Mohammed Mahmoud.

alwahidi22 Mon, 05/21/2007 - 05:16

Thank you Mohammad,

But what is the benefit of using Multiple ASes on the router ..... ?

Regards,

Ibrahim Alwahidi

Correct Answer
mohammedmahmoud Mon, 05/21/2007 - 05:25

Hi,

EIGRP multiple ASs are used in designs when it is required to partition your AS, into smaller parts for design consideration, a single EIGRP process is analogous to an area of a link-state protocol. Multiple routing processes can be configured to achieve a hierarchy.

You can configure more than one EIGRP autonomous system on the same router, but Cisco does not recommend it. Multiple EIGRP autonomous systems on the same router that use mutual redistribution can cause discrepancies in the EIGRP topology table. Cisco recommends you configure only one EIGRP autonomous system in any single autonomous system.

HTH, please do rate all helpful replies,

Mohammed Mahmoud.

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