From: tv (tvarriale@xxxxxxxxxxxx)
Date: Thu Jan 18 2001 - 01:21:20 GMT-3
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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