From: Sam (SamB@xxxxxxxxx)
Date: Tue Feb 12 2002 - 14:31:30 GMT-3
EIGRP Stub Areas
A new feature available in 12.0(7)T IOS allows the use of creating the
remote branch routers as stubs. This means that the branches will send a
special 'peer information' packet to all of its neighbor s (i.e. the
Distribution router) reporting its status as a stub router. Included in this
packet will be an indication of route types it will advertise (i.e.
connected routes). Similarly, for the backup EIGRP AS each branch router
would also be configured as a stub preventing updates from flowing to all
X.25 connected backup routers.
Subsequently, if the Distribution Router receives 'stub' information from a
branch router, it will not query those routers for any routes. This resolves
the Query boundary issue within the same region, and in combination with BGP
in the backbone will eradicate Queries from the entire topology, though
still keeping the advantages of a dynamic routing protocol for rapid backup
initiation.
Advantages
7 Minimizes routing table sizes at all layers
7 Eradicates Query Boundary Issue completely
7 No Queries on backup interfaces (if EIGRP utilized on backup
links)
Caveats
7 If EIGRP is the routing protocol on the backup links, if default
routing is instigated then it is possible that all incorrectly configured
applications will follow the default path to the core, which could
potentially waste bandwidth on low speed links.
----- Original Message -----
From: "Zhang, George" <George.Zhang@compuware.com>
To: <ccielab@groupstudy.com>
Sent: Friday, February 08, 2002 7:35 AM
Subject: Question EIGRP stub routing
I am reading the chapter 11 of CCIE practical studies (Karl Solie) about
EIGRP Stub routing (page 710). However, I can not find anything about EIGRP
Stub routing on the Doc CD. Anybody knows where I can find it on the CD?
Thanks.
George
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