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New Member

MP BGP vpnv4 issue

Hello,

i have some problems with routing updates in my mpls could. i have three routers, one is configured as route reflector the other two are clients. I have three vrf's configured. The topology and config is attched.

on the router p1 i do net get any routing information from the other sites.

here the output from p2

show ip bgp vpnv4 rd 65000:100

BGP table version is 13, local router ID is 172.16.131.252

     Network          Next Hop            Metric LocPrf Weight Path

Route Distinguisher: 65000:100 (default for vrf NCS)

*>  172.22.3.0/29    0.0.0.0                  0         32768 ?

*>  172.22.3.241/32  0.0.0.0                  0         32768 ?

here the output from p1

show ip bgp vpnv4 rd 65000:100

     Network          Next Hop            Metric LocPrf Weight Path

Route Distinguisher: 65000:100 (default for vrf NCS)

*>  0.0.0.0          172.22.25.6              1         32768 ?

*   10.0.9.0/24      172.22.25.238            1         32768 i

*>                   172.22.9.6               2         32768 ?

*>  91.198.79.0/25   172.22.25.6             20         32768 ?

*>  172.22.0.0/29    172.22.25.238            1         32768 i

* i                  172.16.128.252           0    100      0 ?

*>  172.22.0.241/32  172.22.25.238            1         32768 i

* i                  172.16.128.252           0    100      0 ?

*>  172.22.0.242/32  172.22.25.238            1         32768 i

* i                  172.16.128.252          11    100      0 ?

*>i 172.22.3.0/29    172.16.131.252           0    100      0 ?

*>i 172.22.3.241/32  172.16.131.252           0    100      0 ?

and here from p3

BGP table version is 2367, local router ID is 172.16.128.252

   Network          Next Hop            Metric LocPrf Weight Path

Route Distinguisher: 65000:100 (default for vrf NCS)

*>i0.0.0.0          172.16.130.252           1    100      0 ?

*>i10.0.9.0/24      172.16.130.252           1    100      0 i

* i                 172.16.130.252           2    100      0 ?

* i                 172.16.138.252           3    100      0 ?

*>i91.198.79.0/25   172.16.130.252          20    100      0 ?

* i172.22.0.0/29    172.16.130.252           1    100      0 i

*>                  0.0.0.0                  0         32768 ?

* i172.22.0.241/32  172.16.130.252           1    100      0 i

*>                  0.0.0.0                  0         32768 ?

* i172.22.0.242/32  172.16.130.252           1    100      0 i

*>                  172.22.0.6              11         32768 ?

*>i172.22.3.0/29    172.16.138.252           1    100      0 i

* i                 172.16.131.252           0    100      0 ?

*>i172.22.3.241/32  172.16.138.252           1    100      0 i

* i                 172.16.131.252           0    100      0 ?

somehow the bgp session is established but vpnv4 doesn't get established.

P1

show ip proto | begin bgp

Routing Protocol is "bgp 65000"

  Outgoing update filter list for all interfaces is not set

  Incoming update filter list for all interfaces is not set

  Route Reflector for address family VPNv4 Unicast, 3 clients

  IGP synchronization is disabled

  Automatic route summarization is disabled

  Neighbor(s):

    Address          FiltIn FiltOut DistIn DistOut Weight RouteMap

    172.16.131.252

    172.16.135.252

  Maximum path: 1

  Routing Information Sources:

    Gateway         Distance      Last Update

    172.16.131.252       200      00:01:00

  Distance: external 20 internal 200 local 200

P2 #show ip proto | begin bgp

*** IP Routing is NSF aware ***

Routing Protocol is "bgp 65000"

  Outgoing update filter list for all interfaces is not set

  Incoming update filter list for all interfaces is not set

  IGP synchronization is disabled

  Automatic route summarization is disabled

  Neighbor(s):

    Address          FiltIn FiltOut DistIn DistOut Weight RouteMap

    172.16.130.252

  Maximum path: 1

  Routing Information Sources:

    Gateway         Distance      Last Update

  Distance: external 20 internal 200 local 200

P3

show ip proto | begin bgp

Routing Protocol is "bgp 65000"

  Outgoing update filter list for all interfaces is not set

  Incoming update filter list for all interfaces is not set

  IGP synchronization is disabled

  Automatic route summarization is disabled

  Neighbor(s):

    Address          FiltIn FiltOut DistIn DistOut Weight RouteMap

    172.16.130.252

  Maximum path: 1

  Routing Information Sources:

    Gateway         Distance      Last Update

    172.16.130.252       200      00:01:44

  Distance: external 20 internal 200 local 200

on the p1 i get every couple minutes this

Aug 14 18:27:04.115: %BGP-5-NBR_RESET: Neighbor 172.16.131.252 reset (Peer closed the session)

Aug 14 18:27:04.115: %BGP-3-NOTIFICATION: received from neighbor 172.16.131.252 4/0 (hold time expired) 0 bytes

Aug 14 18:27:04.119: %BGP-5-ADJCHANGE: neighbor 172.16.131.252 Down Peer closed the session

Aug 14 18:27:04.119: %BGP_SESSION-5-ADJCHANGE: neighbor 172.16.131.252 VPNv4 Unicast topology base removed from session  Peer closed the session

Aug 14 18:27:04.119: %BGP_SESSION-5-ADJCHANGE: neighbor 172.16.131.252 IPv4 Unicast topology base removed from session  Peer closed the session

Aug 14 18:27:14.363: %BGP-5-ADJCHANGE: neighbor 172.16.131.252 Up

on p2 i get this

*Aug 14 18:26:52.935: %BGP-3-NOTIFICATION: sent to neighbor 172.16.130.252 4/0 (hold time expired) 0 bytes

*Aug 14 18:26:52.935: %BGP-5-NBR_RESET: Neighbor 172.16.130.252 reset (BGP Notification sent)

*Aug 14 18:26:52.935: %BGP-5-ADJCHANGE: neighbor 172.16.130.252 Down BGP Notification sent

*Aug 14 18:26:52.935: %BGP_SESSION-5-ADJCHANGE: neighbor 172.16.130.252 VPNv4 Unicast topology base removed from session  BGP                                  Notification sent

*Aug 14 18:26:52.935: %BGP_SESSION-5-ADJCHANGE: neighbor 172.16.130.252 IPv4 Unicast topology base removed from session  BGP N                                 otification sent

*Aug 14 18:27:03.179: %BGP-5-ADJCHANGE: neighbor 172.16.130.252 Up

any idea why this happens?

The p2 and p1 are 2900 running 153-3.M.

thanks in advanced

Alex


  • MPLS
1 REPLY
New Member

MP BGP vpnv4 issue

I found the issue, it was a mtu mismatch,

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