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bgp not advertising routes

hacizeynal
Level 1
Level 1

hi all ,I have router that I configured BGP ,it works fine ,here is the output from it 

 

Building configuration...


Current configuration : 2106 bytes
!
! Last configuration change at 17:27:17 UTC Tue Jan 6 2015
version 15.2
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname SPIBR001
!
boot-start-marker
boot-end-marker
!
!
! card type command needed for slot/vwic-slot 0/0
enable secret 5 $1$SqNF$Gju2ru8a2vuU/UkwbI7ph0
!
no aaa new-model
!
ip cef
!
!
!
!
!
!
no ipv6 cef
multilink bundle-name authenticated
!
!
!
!
!
!
!
voice-card 0
!
!
!
!
!
!
!
!
license udi pid CISCO2951/K9 sn FCZ1829604J
hw-module pvdm 0/0
!
hw-module pvdm 0/1
!
!
!
username cisco privilege 15 secret 5 $1$44gd$pvcB6PwkI9a4sgXhV7075.
username admin privilege 15 secret 5 $1$gB0E$rPx95YRpsXC4.GRfTnHGE1
!
redundancy
!
!
!
!
!
!
interface Embedded-Service-Engine0/0
 no ip address
 shutdown
!
interface GigabitEthernet0/0
 no ip address
 duplex auto
 speed auto
!
interface GigabitEthernet0/1
 ip address 172.31.255.246 255.255.255.252
 duplex auto
 speed auto
!
interface GigabitEthernet0/2
 ip address 10.39.255.1 255.255.255.252
 duplex auto
 speed auto
!
router bgp 65040
 bgp log-neighbor-changes
 aggregate-address 10.39.0.0 255.255.0.0
 neighbor 10.39.255.2 remote-as 65040
 neighbor 10.39.255.2 password 7 08036969263A
 neighbor 10.39.255.2 fall-over bfd
 neighbor 10.39.255.2 soft-reconfiguration inbound
 neighbor 172.31.255.245 remote-as 65000
 neighbor 172.31.255.245 password 7 112B3C223831
 neighbor 172.31.255.245 fall-over bfd
 neighbor 172.31.255.245 soft-reconfiguration inbound
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
!
ip access-list standard BGP_DAMP
 permit 172.31.255.246
!
!
nls resp-timeout 1
cpd cr-id 1
route-map BGP_DAMP permit 10
 match ip address BGP_DAMP
 set dampening 5 1900 2000 10
!
!
!
control-plane
!
 !
 !
 !
!
!
!
mgcp profile default
!
!
!
!
!
gatekeeper
 shutdown
!
!
!
line con 0
line aux 0
line 2
 no activation-character
 no exec
 transport preferred none
 transport output pad telnet rlogin lapb-ta mop udptn v120 ssh
 stopbits 1
line vty 0 4
 password 7 106C2C3E2A34
 login local
 transport input all
!
scheduler allocate 20000 1000
!
end

 

 

 

But also connected core switch and established iBGP between them ,but unfortunately core switch doesnt have route to others ,

i 0.0.0.0          172.31.255.245           0    100      0 65000 65456 29049 i
 * i 10.0.0.0/16      172.31.255.245           0    100      0 65000 65001 i
 * i 10.1.0.0/16      172.31.255.245           0    100      0 65000 65001 i
 * i 10.1.1.32/28     172.31.255.245           0    100      0 65000 65002 i

 * i 10.2.0.0/16      172.31.255.245           0    100      0 65000 65002 i
 * i 10.24.2.0/23     172.31.255.245           0    100      0 65000 65001 i
 * i 10.24.4.0/24     172.31.255.245           0    100      0 65000 65001 i
 * i 10.24.6.0/23     172.31.255.245           0    100      0 65000 65001 i
 * i 10.24.8.0/23     172.31.255.245           0    100      0 65000 65002 i
 *>  10.39.0.0/24     0.0.0.0                  0         32768 ?
 * i 10.39.0.0/16     10.39.255.1              0    100      0 i
 *>                   0.0.0.0                            32768 i
 *>  10.39.30.0/24    0.0.0.0                  0         32768 ?
     Network          Next Hop            Metric LocPrf Weight Path
 *>  10.39.255.0/30   0.0.0.0                  0         32768 ?
 * i 10.100.0.0/22    172.31.255.245           0    100      0 65000 i
 * i 10.102.0.0/16    172.31.255.245           0    100      0 65000 i
 * i 10.202.0.0/16    172.31.255.245           0    100      0 65000 i
 * i 31.171.126.128/26
                       172.31.255.245           0    100      0 65000 65001 i
 *
                       172.31.255.245           0    100      0 65000 65002 65002 65002 65002 i
 * i 172.16.8.0/22    172.31.255.245           0    100      0 65000 65001 i
 * i 172.17.0.0/17    172.31.255.245           0    100      0 65000 65001 i
 * i 172.17.128.0/17  172.31.255.245           0    100      0 65000 65001 i
 * i 172.18.0.0/17    172.31.255.245           0    100      0 65000 65002 i
 * i 172.18.128.0/17  172.31.255.245           0    100      0 65000 65002 i
 * i 172.30.0.0       172.31.255.245           0    100      0 65000 i
 * i 172.30.252.0/24  172.31.255.245           0    100      0 65000 65456 i
 * i 172.31.0.0       172.31.255.245           0    100      0 65000 i
 * i 172.31.252.0/24  172.31.255.245           0    100      0 65000 65456 i

 

Anybody will help me ?

1 Reply 1

eduardopozo56
Level 1
Level 1

Check that on the core switch you have a route to the BGP next hop "172.31.255.245 ". If not, you need one of these:
a- A route to this ip

b- Route-reflector capability on the ASBR

c- next-hop-self on the ASBR

 

Remember that on iBGP relationships, the next-hop is not changed when propagating updates/routes

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