From: ccie candidate (ccie1@xxxxxxxxx)
Date: Thu Aug 22 2002 - 14:21:55 GMT-3
good question
in fact you only need the cluster id command when you have more than one RR wor
king on the same cluster ....the command is to let them know about each other .
if you have multiple clusters , but you have only one RR per cluster ..you dont
have to use this command .
see this
http://www.cisco.com/univercd/cc/td/doc/cisintwk/ics/icsbgp4.htm#xtocid2043943
cheers
--On Thu, 22 Aug 2002 15:48:48 Mhlanga Libone wrote: >You are right if you intend them to be in the same cluster then the id must >be the same which also means of course that if they have different id's then >they are in different clusters !! > >-----Original Message----- >From: Michael Snyder [mailto:msnyder@revolutioncomputer.com] >Sent: 22 August 2002 15:02 >To: ccielab@groupstudy.com >Subject: simple bgp cluster-id question > > >When you are using RR's back to back, do you set the cluster ID to the >same value so the RR's know they are working within the same cluster? >Or different values so each RR can keep it's routes separate from the >other RR? > >I am leaning to former, and not the later. That cluster id's should be >the same on back to back RR's. Note, when I first read about the >command, I thought it was the other way around. > >Is there any time that two RR's should have different cluster ID's? > >---------------------------------------------------------- > >Usage Guidelines >Together, a route reflector and its clients form a cluster. >Usually a cluster of clients will have a single route reflector. In that >case, the cluster is identified by the router ID of the route reflector. >In order to increase redundancy and avoid a single point of failure, a >cluster might have more than one route reflector. In this case, all >route reflectors in the cluster must be configured with the 4-byte >cluster ID so that a route reflector can recognize updates from route >reflectors in the same cluster. >If the cluster has more than one route reflector, use this command to >configure the cluster ID. >Examples >In the following example, the local router is one of the route >reflectors serving the cluster. It is configured with the cluster ID to >identify the cluster. >router bgp 5 > neighbor 198.92.70.24 route-reflector-client > bgp cluster-id 50000
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