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IBGP PEERING

I have a problem in BGP after configuring BGP i am not getting any routes in bgp routing table what is the issue can anyone help me regarding this isssue it is urgent.Here is the configuration.

R1#sh run | s r b
router bgp 500
 synchronization
 bgp log-neighbor-changes
 network 1.1.1.0
 network 4.4.4.0
 network 10.1.1.0
 neighbor 1.1.1.2 remote-as 500
 neighbor 4.4.4.1 remote-as 500

R1#sh ip bgp summary
BGP router identifier 4.4.4.2, local AS number 500
BGP table version is 1, main routing table version 1

Neighbor        V           AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
1.1.1.2         4          500     220     220        1    0    0 03:17:38        0
4.4.4.1         4          500     214     214        1    0    0 03:12:49        0

R2#sh run | s r b
router bgp 500
 synchronization
 bgp log-neighbor-changes
 network 1.1.1.0
 network 2.2.2.0
 network 20.1.1.0
 neighbor 1.1.1.1 remote-as 500
 neighbor 2.2.2.2 remote-as 500

R2#sh ip bgp su
R2#sh ip bgp summary
BGP router identifier 2.2.2.1, local AS number 500
BGP table version is 1, main routing table version 1

Neighbor        V           AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
1.1.1.1         4          500     160     160        1    0    0 02:23:37        0
2.2.2.2         4          500     157     156        1    0    0 02:20:05        0

R3#sh run | s r b
router bgp 500
 synchronization
 bgp log-neighbor-changes
 network 2.2.2.0
 network 3.3.3.0
 network 30.1.1.0
 neighbor 2.2.2.1 remote-as 500
 neighbor 3.3.3.2 remote-as 500

R3#sh ip bg summary
BGP router identifier 3.3.3.1, local AS number 500
BGP table version is 1, main routing table version 1

Neighbor        V           AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
2.2.2.1         4          500     218     220        1    0    0 03:16:43        0
3.3.3.2         4          500     218     217        1    0    0 03:15:25        0

R4#sh run | s r b
router bgp 500
 synchronization
 bgp log-neighbor-changes
 network 3.3.3.0
 network 4.4.4.0
 network 40.1.1.0
 neighbor 3.3.3.1 remote-as 500
 neighbor 4.4.4.2 remote-as 500

R4#sh ip bgp summary
BGP router identifier 4.4.4.1, local AS number 500
BGP table version is 1, main routing table version 1

Neighbor        V           AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
3.3.3.1         4          500     219     220        1    0    0 03:17:05        0
4.4.4.2         4          500     219     218        1    0    0 03:17:07        0

1 Reply 1

Hi Prashant,

Networks are not entered in the BGP table because the exact networks specified in the network statement under BGP are not present in the routing table. This statement without the "mask" option assumes the classfull boundary which in your case is /8.

In order to solve the issue in your topology add "mask 255.255.255.0" after each network statement under BGP. For example:

network 40.1.1.0 mask 255.255.255.0

Let me know how it goes,

​Jacobo

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