Dear all,
I am doing some bgp lab practise, once i finished the bgp configuaration on one router, observe there is one additional bgp route appear in the routing table. Could you give some idea why that happened? Thank you.
Vail#sh ip ro
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
B 192.168.200.0/24 [20/2195456] via 192.168.1.225, 00:08:46
192.168.255.0/32 is subnetted, 1 subnets
C 192.168.255.254 is directly connected, Loopback0
192.168.1.0/24 is variably subnetted, 4 subnets, 2 masks
B 192.168.1.0/24 [20/2169856] via 192.168.1.225, 00:08:46
C 192.168.1.224/30 is directly connected, Serial1/1.2 <<<<<(Why have this route)
B 192.168.1.216/30 [20/0] via 192.168.1.225, 00:08:46
C 192.168.1.220/30 is directly connected, Serial1/1.1
B 192.168.100.0/24 [20/0] via 192.168.1.225, 00:08:46
Vail#
Vail#sh ip int brief
Interface IP-Address OK? Method Status Protocol
Serial1/0 unassigned YES TFTP up down
Serial1/0.1 unassigned YES NVRAM up down
Serial1/0.2 unassigned YES NVRAM deleted down
Serial1/1 unassigned YES TFTP up up
Serial1/1.1 192.168.1.221 YES manual up up
Serial1/1.2 192.168.1.226 YES manual up up <<<<<<<<<<<<<<<<
Serial1/2 unassigned YES NVRAM administratively down down
Serial1/3 unassigned YES NVRAM administratively down down
Loopback0 192.168.255.254 YES manual up up
Vail#
Vail#sh ip b
BGP table version is 7, local router ID is 192.168.255.254
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 192.168.1.0 192.168.1.225 2169856 0 200 ?
*> 192.168.1.216/30 192.168.1.225 0 0 200 ?
r> 192.168.1.224/30 192.168.1.225 0 0 200 ? <<<<<<<<<<<<<
*> 192.168.100.0 192.168.1.225 0 0 200 ?
*> 192.168.200.0 192.168.1.225 2195456 0 200 ?
Vail#
Vail#sh run int s1/1.2
Building configuration...
Current configuration : 121 bytes
!
interface Serial1/1.2 point-to-point
ip address 192.168.1.226 255.255.255.252
frame-relay interface-dlci 311
end
Vail#
Vail#sh ip b s
BGP router identifier 192.168.255.254, local AS number 100
BGP table version is 7, main routing table version 7
5 network entries using 585 bytes of memory
5 path entries using 260 bytes of memory
4/3 BGP path/bestpath attribute entries using 496 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 using 1365 total bytes of memory
BGP activity 11/6 prefixes, 11/6 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
192.168.1.222 4 100 42 50 7 0 0 00:10:05 0
192.168.1.225 4 200 90 82 7 0 0 00:10:05 5 <<<<<<<<<<<<<<<<<<
Vail#
