Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

BGP Troublshooting

I have configured network contaion  3 routers R1----R2-----R3, router 2 & 3 connected together via EBGP direct connect & router 1 & 2 connect together via IBGP , I have Advertise the follwoing networks 10.10.10.0, 20.20.20.0, 30.30.30.0, from router 3 to router 2 , the problem is i have the previous subnets in my router 1 but i cannot ping to it also when i have turn on debug ip BGP events i have the follwoing massage :

Mar  5 15:34:30.063: BGP: Regular scanner event timer

*Mar  5 15:34:30.063: BGP: Import timer expired. Walking from 1 to 1

*Mar  5 15:34:45.063: BGP: Regular scanner event timer

*Mar  5 15:34:45.063: BGP: Performing BGP general scanning

*Mar  5 15:34:45.063: BGP(0): scanning IPv4 Unicast routing tables

*Mar  5 15:34:45.063: BGP(IPv4 Unicast): Performing BGP Nexthop scanning for general scan

*Mar  5 15:34:45.067: BGP(0): Future scanner version: 70, current scanner version: 69

*Mar  5 15:34:45.067: BGP(1): scanning IPv6 Unicast routing tables

*Mar  5 15:34:45.071: BGP(IPv6 Unicast): Performing BGP Nexthop scanning for general scan

*Mar  5 15:34:45.071: BGP(1): Future scanner version: 71, current scanner version: 70

*Mar  5 15:34:45.071: BGP(2): scanning VPNv4 Unicast routing tables

*Mar  5 15:34:45.071: BGP(VPNv4 Unicast): Performing BGP Nexthop scanning for general scan

*Mar  5 15:34:45.071: BGP(2): Future scanner version: 71, current scanner version: 70

*Mar  5 15:34:45.071: BGP(4): scanning IPv4 Multicast routing tables

*Mar  5 15:34:45.075: BGP(IPv4 Multicast): Performing BGP Nexthop scanning for general scan

*Mar  5 15:34:45.075: BGP(4): Future scanner version: 71, current scanner version: 70

*Mar  5 15:34:45.075: BGP(5): scanning IPv6 Multicast routing tables

*Mar  5 15:34:45.075: BGP(IPv6 Multicast): Performing BGP Nexthop scanning for general scan

*Mar  5 15:34:45.075: BGP(5): Future scanner version: 71, current scanner version: 70

Best Regards

  • Small Business Routers
2 REPLIES
Bronze

BGP Troublshooting

Can you show your bgp configuration, a show cdp neighbors, and a show ip bgp neighbors?

Thanks!

Ven

Ven Taylor
New Member

BGP Troublshooting

Hi Ven :

( Router 3)

MAIN-SOURSE#show ip bgp

BGP table version is 4, local router ID is 40.40.40.1

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

*> 20.20.20.0/32    0.0.0.0                  0         32768 i

*> 30.30.30.0/32    0.0.0.0                  0         32768 i

*> 40.40.40.0/32    0.0.0.0                  0         32768 i

MAIN-SOURSE#

router bgp 400

no synchronization

bgp log-neighbor-changes

network 20.20.20.0 mask 255.255.255.255

network 30.30.30.0 mask 255.255.255.255

network 40.40.40.0 mask 255.255.255.255

neighbor 217.173.48.206 remote-as 500

no auto-summary

!

ip forward-protocol nd

ip route 20.20.20.0 255.255.255.255 Null0

ip route 30.30.30.0 255.255.255.255 Null0

ip route 30.30.30.1 255.255.255.255 Null0

ip route 40.40.40.0 255.255.255.255 Null0

ip route 40.40.40.1 255.255.255.255 Null0

!

MAIN-SOURSE#show cdp neighbors

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge

                  S - Switch, H - Host, I - IGMP, r - Repeater

Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID

ISP-Main         Gig 0/0            159          R        7206VXR   Gig 0/0

MAIN-SOURSE#

------------------------------------------------------------------------------------------------------

( Router 2)

ISP-Main#show ip bgp

BGP table version is 4, local router ID is 217.173.48.206

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

*> 20.20.20.0/32    217.173.48.205           0             0 400 i

*> 30.30.30.0/32    217.173.48.205           0             0 400 i

*> 40.40.40.0/32    217.173.48.205           0             0 400 i

router bgp 500

no synchronization

bgp log-neighbor-changes

neighbor 172.21.1.2 remote-as 500

neighbor 172.21.1.2 next-hop-self

neighbor 217.173.48.205 remote-as 400

no auto-summary

ISP-Main#show cdp neighbors

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge

                  S - Switch, H - Host, I - IGMP, r - Repeater

Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID

Router           Gig 1/0            126          R        7206VXR   Gig 0/0

MAIN-SOURSE      Gig 0/0            126          R        7206VXR   Gig 0/0

--------------------------------------------------------------------------------------------------------------

( Router 1)

Router#show ip bgp

BGP table version is 4, local router ID is 172.21.1.2

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

*>i20.20.20.0/32    172.21.1.1               0    100      0 400 i

*>i30.30.30.0/32    172.21.1.1               0    100      0 400 i

*>i40.40.40.0/32    172.21.1.1               0    100      0 400 i

Router#

router bgp 500

no synchronization

bgp log-neighbor-changes

neighbor 172.21.1.1 remote-as 500

no auto-summary

!

ip forward-protocol nd

!

no ip http server

no ip http secure-server

Router#show cdp neighbors

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge

                  S - Switch, H - Host, I - IGMP, r - Repeater

Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID

ISP-Main         Gig 0/0            171          R        7206VXR   Gig 1/0

Router#

911
Views
0
Helpful
2
Replies
This widget could not be displayed.