From: Mark Stover (mstover@xxxxxxxxx)
Date: Thu Jan 18 2001 - 01:33:48 GMT-3
No, All route-reflectors in a cluster (being used for redundancy) must have the
same cluster-id, otherwise it is possible to get routing loops.
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> tv
> Sent: Wednesday, January 17, 2001 11:21 PM
> To: Daniel M. Dawson
> Cc: ccielab@groupstudy.com
> Subject: Re: BGP Clusters with Multiple Route Reflectors
>
>
> The bgp cluster-ids MUST be different and only goes on the
> RRs..NOT the
> clients.
>
> tv
>
> ----- Original Message -----
> From: "Daniel M. Dawson" <dandawson@lucent.com>
> To: <ccielab@groupstudy.com>
> Sent: Wednesday, January 17, 2001 7:10 PM
> Subject: BGP Clusters with Multiple Route Reflectors
>
>
> > Hi all,
> >
> > A question about multiple route reflectors within a
> cluster. (I've set
> this
> > up based on Lab 5s layout). In this particular case I have
> R4 and R5 as
> the
> > route reflectors and R3 and R6 as the route reflector
> clients. These
> route
> > reflecotr clients are configured with neighbor statements
> to each route
> > reflector for redundancy. When I set up the
> route-reflectors only (no the
> > clients) with the cluster ID the clients get double listings for all
> > networks in their BGP table. The reflectors have only the
> single entry
> for
> > each entry. As shown below:
> >
> >
> > R5# "SHOW IP BGP" output (Route-reflector)
> > BGP table version is 5, local router ID is 172.168.200.1
> > Status codes: s suppressed, d damped, h history, * valid, >
> best, i -
> > internal
> > Origin codes: i - IGP, e - EGP, ? - incomplete
> >
> > Network Next Hop Metric LocPrf Weight Path
> > *>i20.0.0.0 172.168.100.3 0 100 0 ?
> > *> 71.0.0.0 137.20.20.1 0 2 3 i
> > *>i172.168.40.0/24 172.168.200.2 0 100 0 i
> > *>i172.168.60.0/24 172.168.100.6 0 100 0 i
> >
> > R6# "SHOW IP BGP" output (Route-reflector-client)
> > BGP table version is 17, local router ID is 172.168.100.6
> > Status codes: s suppressed, d damped, h history, * valid, >
> best, i -
> > internal
> > Origin codes: i - IGP, e - EGP, ? - incomplete
> >
> > Network Next Hop Metric LocPrf Weight Path
> > *>i20.0.0.0 172.168.100.3 0 100 0 ?
> > * i 172.168.100.3 0
> 100 0 ?
> > * i71.0.0.0 137.20.20.1 100
> 0 2 3 i
> > *>i 137.20.20.1
> 100 0 2 3 i
> > *>i172.168.40.0/24 172.168.200.2 0 100 0 i
> > * i 172.168.200.2 0
> 100 0 i
> > *> 172.168.60.0/24 0.0.0.0 0 32768 i
> >
> >
> > If instead I put the Cluster Id on the on the clients as
> well, the clients
> > have only the one entry for each network int the table.
> However a strange
> > thing occurs. Any routes coming from another client within
> the cluster
> does
> > not get put into the table of the other clients. The route
> reflectors
> > themselves do have the route in their BGP table and are
> advertizing it to
> > the clients. Show BGP table after putting clusterIDs on
> the clients shown
> > below:
> >
> >
> > R5# "SHOW IP BGP" output (Route-reflector)
> > BGP table version is 11, local router ID is 172.168.200.1
> > Status codes: s suppressed, d damped, h history, * valid, >
> best, i -
> > internal
> > Origin codes: i - IGP, e - EGP, ? - incomplete
> >
> > Network Next Hop Metric LocPrf Weight Path
> > *>i20.0.0.0 172.168.100.3 0 100 0 ?
> > *> 71.0.0.0 137.20.20.1 0 2 3 i
> > *>i172.168.40.0/24 172.168.200.2 0 100 0 i
> > *>i172.168.60.0/24 172.168.100.6 0 100 0 i
> >
> >
> >
> > R6# "SHOW IP BGP" output (Route-reflector-client)
> > BGP table version is 4, local router ID is 172.168.100.6
> > Status codes: s suppressed, d damped, h history, * valid, >
> best, i -
> > internal
> > Origin codes: i - IGP, e - EGP, ? - incomplete
> >
> > Network Next Hop Metric LocPrf Weight Path
> > *>i71.0.0.0 137.20.20.1 100 0 2 3 i
> > *>i172.168.40.0/24 172.168.200.2 0 100 0 i
> > *> 172.168.60.0/24 0.0.0.0 0 32768 i
> >
> >
> >
> > So the question is should I be using Cluster-ID on the
> > route-reflector-clients and if so, how do I get the client
> to see routes
> > originated on other clients. If I shouldn't be using
> cluster-ID on the
> > clients, are the double routes supposed to be there?
> Thanks for any help.
> >
> >
> > Configs:
> >
> > WITH CLUSTER ID ON THE ROUTE-REFLECTOR-CLIENT
> >
> > R4 (RR)
> > router bgp 1
> > no synchronization
> > bgp cluster-id 10
> > network 172.168.40.0 mask 255.255.255.0
> > neighbor 172.168.100.3 remote-as 1
> > neighbor 172.168.100.3 route-reflector-client
> > neighbor 172.168.100.5 remote-as 1
> > neighbor 172.168.100.6 remote-as 1
> > neighbor 172.168.100.6 route-reflector-client
> >
> > R3 (RRC)
> > router bgp 1
> > no synchronization
> > redistribute static
> > bgp cluster-id 10
> > neighbor 172.168.100.5 remote-as 1
> > neighbor 172.168.100.5 soft-reconfiguration inbound
> > neighbor 172.168.200.2 remote-as 1
> > neighbor 172.168.200.2 soft-reconfiguration inbound
> >
> >
> > R5 (RR)
> > router bgp 1
> > no synchronization
> > bgp cluster-id 10
> > neighbor 137.20.20.1 remote-as 2
> > neighbor 172.168.100.3 remote-as 1
> > neighbor 172.168.100.3 route-reflector-client
> > neighbor 172.168.100.6 remote-as 1
> > neighbor 172.168.100.6 route-reflector-client
> > neighbor 172.168.200.2 remote-as 1
> >
> >
> > R6 (RRC)
> > router bgp 1
> > no synchronization
> > bgp cluster-id 10
> > network 172.168.60.0 mask 255.255.255.0
> > neighbor 172.168.100.5 remote-as 1
> > neighbor 172.168.100.5 soft-reconfiguration inbound
> > neighbor 172.168.200.2 remote-as 1
> > neighbor 172.168.200.2 soft-reconfiguration inbound
> >
> >
> > WITHOUT CLUSTER ID ON THE ROUTE-REFLECTOR-CLIENT
> >
> > R4 (RR)
> > router bgp 1
> > no synchronization
> > bgp cluster-id 10
> > network 172.168.40.0 mask 255.255.255.0
> > neighbor 172.168.100.3 remote-as 1
> > neighbor 172.168.100.3 route-reflector-client
> > neighbor 172.168.100.5 remote-as 1
> > neighbor 172.168.100.6 remote-as 1
> > neighbor 172.168.100.6 route-reflector-client
> >
> > R3 (RRC)
> > router bgp 1
> > no synchronization
> > redistribute static
> > neighbor 172.168.100.5 remote-as 1
> > neighbor 172.168.100.5 soft-reconfiguration inbound
> > neighbor 172.168.200.2 remote-as 1
> > neighbor 172.168.200.2 soft-reconfiguration inbound
> >
> >
> > R5 (RR)
> > router bgp 1
> > no synchronization
> > bgp cluster-id 10
> > neighbor 137.20.20.1 remote-as 2
> > neighbor 172.168.100.3 remote-as 1
> > neighbor 172.168.100.3 route-reflector-client
> > neighbor 172.168.100.6 remote-as 1
> > neighbor 172.168.100.6 route-reflector-client
> > neighbor 172.168.200.2 remote-as 1
> >
> >
> > R6 (RRC)
> > router bgp 1
> > no synchronization
> > network 172.168.60.0 mask 255.255.255.0
> > neighbor 172.168.100.5 remote-as 1
> > neighbor 172.168.100.5 soft-reconfiguration inbound
> > neighbor 172.168.200.2 remote-as 1
> > neighbor 172.168.200.2 soft-reconfiguration inbound
> >
> >
> >
> >
> > Daniel M. Dawson
> > Network Systems Consultant
> > Network Care Professional Services (NPS)
> > Lucent Technologies
> > Mobile: (405) 850-1493
> > Pager: (800) 622-9202
> > E-mail: dandawson@lucent.com
> >
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