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New Member

MPLS and bgp

Hi!

I have som issue in my lab. network. My network has running to PE, one P and to CE node. ISIS protocol is running between PE ans P nodes. BGP  running with ipv4 and vpnv4 enabled in my backbone. And finally i am running ospf between CE and PE routers. I can see all the networks from samme vrf in routing table in CE router but i am not able to ping dem. What am I missing? Soory for my very bad english and many tanks in advansed!

Please refer to my posted topology

3 REPLIES
Cisco Employee

MPLS and bgp

Hi,

Do you have mpls enabled between PEs and P nodes?. Can you try "ping mpls ipv4 255.255.255.255 (from one side PE) and see if it works?.

-Nagendra

New Member

MPLS and bgp

Hi

Yes, MPLS is enables on participating interfaces. And i can not ping a remote PE loopback interface either

neighbour P node. Here is output of ping and MPLS ldp binding:

ping mpls ipv4 4.4.4.4 255.255.255.0

Sending 5, 100-byte MPLS Echos to 4.4.4.4/24,

  lib entry: 34.1.1.0/24, rev 12

    local binding:  label: 18

  lib entry: 80.80.80.0/24, rev 6

    local binding:  label: imp-null

PE-2#sh mpls ldp bindings                

  lib entry: 2.2.2.0/24, rev 4

    local binding:  label: imp-null

  lib entry: 3.3.3.0/24, rev 8

    local binding:  label: 16

  lib entry: 4.4.4.0/24, rev 10

    local binding:  label: 17

  lib entry: 23.1.1.0/24, rev 2

    local binding:  label: imp-null

  lib entry: 34.1.1.0/24, rev 12

    local binding:  label: 18

  lib entry: 80.80.80.0/24, rev 6

    local binding:  label: imp-null

Here is thr output og route table in CE-B2-7 node ) please refer to the attached toplogy figure!

sh ip route:

O IA 192.168.15.0/24 [110/2] via 192.168.27.1, 00:18:39, GigabitEthernet0/0

     5.0.0.0/32 is subnetted, 1 subnets

O IA    5.5.5.5 [110/3] via 192.168.27.1, 00:18:39, GigabitEthernet0/0

C    192.168.27.0/24 is directly connected, GigabitEthernet0/0

     7.0.0.0/24 is subnetted, 1 subnets

C       7.7.7.0 is directly connected, Loopback0

Cisco Employee

MPLS and bgp

Hi,

The issue is that ou use a /24 mask on the loopback interfaces. OSPF sees the loopback addresses as a /32 while LDP sees them as a /24. You should normally use a /32 mask on loopback interface. This should fix the issue.

Regards

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México 
Paseo de la Reforma 222 Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
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