Before reading I know the answer to this question after a bit of research - but I would like to open this up as a teaser to who else gets the right answer :-)
I am using the INE volume I topology - IGP is running on all internal routers - R1 is a route reflector to R3-R6 and SW1-SW4 with the following config -
router bgp 100
no synchronization
bgp router-id 150.25.1.1
bgp cluster-id 150.25.1.1
bgp log-neighbor-changes
network 150.25.1.0 mask 255.255.255.0
neighbor 155.25.0.5 remote-as 100
neighbor 155.25.0.5 route-reflector-client
neighbor 155.25.13.3 remote-as 100
neighbor 155.25.13.3 route-reflector-client
neighbor 155.25.58.8 remote-as 100
neighbor 155.25.58.8 route-reflector-client
neighbor 155.25.67.7 remote-as 100
neighbor 155.25.67.7 route-reflector-client
neighbor 155.25.79.9 remote-as 100
neighbor 155.25.79.9 route-reflector-client
neighbor 155.25.108.10 remote-as 100
neighbor 155.25.108.10 route-reflector-client
neighbor 155.25.146.4 remote-as 100
neighbor 155.25.146.4 route-reflector-client
neighbor 155.25.146.6 remote-as 100
neighbor 155.25.146.6 route-reflector-client
no auto-summary
All the relevant iBGP peers are up
Rack25R1#show bgp ipv4 unicast summary
BGP router identifier 150.25.1.1, local AS number 100
BGP table version is 24, main routing table version 24
23 network entries using 3036 bytes of memory
37 path entries using 1924 bytes of memory
7/6 BGP path/bestpath attribute entries using 1176 bytes of memory
4 BGP AS-PATH entries using 96 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
Bitfield cache entries: current 1 (at peak 1) using 32 bytes of memory
BGP using 6264 total bytes of memory
BGP activity 69/46 prefixes, 111/74 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
155.25.0.5 4 100 85 118 24 0 0 00:21:25 5
155.25.13.3 4 100 84 117 24 0 0 00:21:39 5
155.25.58.8 4 100 57 92 24 0 0 00:21:39 1
155.25.67.7 4 100 57 96 24 0 0 00:21:20 1
155.25.79.9 4 100 57 92 24 0 0 00:21:32 1
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
155.25.108.10 4 100 56 92 24 0 0 00:21:39 1
155.25.146.4 4 100 85 112 24 0 0 00:21:30 11
155.25.146.6 4 100 93 120 24 0 0 00:21:41 11
My question is can you tell me why I have two update groups - shown below -
Rack25R1#show bgp ipv4 unicast replication
Current Next
Index Members Leader MsgFmt MsgRepl Csize Version Version
1 4 155.25.108.10 76 84 0/1000 24/0
2 4 155.25.0.5 13 39 0/1000 24/0
Rack25R1#
To demonstrate you have the correct answer - please show relevant verification commands?
The topology used in this question is the same as task 7.10 in volume I
Enjoy :-)