Information Technology Reference
In-Depth Information
Step 7: Verify BGP Reachability for All Prefixes
Verify that all sessions are up and that all routes are received correctly. The following
examples show sample outputs.
Example 8-20 shows the BGP summary table on R1. There are five BGP sessions: one ex-
ternal with R8, three iBGP sessions to all other RRs, and one iBGP session with its client R3.
Example 8-20
BGP Summary Table on R1
R1#show ip bgp summary
BGP router identifier 192.168.100.1, local AS number 100
BGP table version is 9, main routing table version 9
4 network entries and 7 paths using 668 bytes of memory
2 BGP path attribute entries using 120 bytes of memory
5 BGP rrinfo entries using 120 bytes of memory
1 BGP AS-PATH entries using 24 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
BGP activity 5/41 prefixes, 10/3 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
192.168.18.8 4 200 1151 1153 9 0 0 19:06:30 1
192.168.100.2 4 100 1152 1154 9 0 0 19:07:32 1
192.168.100.3 4 100 29 32 9 0 0 00:24:07 1
192.168.100.4 4 100 1153 1153 9 0 0 19:07:33 2
192.168.100.5 4 100 1153 1153 9 0 0 19:07:07 2
Example 8-21 shows the BGP RIB on R1. The redundant path for each internal prefix is
received from the redundant RR.
Example 8-21
BGP RIB on R1
R1#show ip bgp
BGP table version is 9, local router ID is 192.168.100.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 172.16.0.0 192.168.18.8 0 0 200 i
* i192.168.200.0 192.168.100.3 0 100 0 i
*>i 192.168.100.3 0 100 0 i
* i192.168.201.0 192.168.100.6 0 100 0 i
*>i 192.168.100.6 0 100 0 i
* i192.168.202.0 192.168.100.7 0 100 0 i
*>i 192.168.100.7 0 100 0 i
