From: Daniel M. Dawson (dandawson@xxxxxxxxxx)
Date: Wed Jan 17 2001 - 22:10:39 GMT-3
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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