[c-nsp] Very basic MPLS VPN issue
Yuri Bank
yuribank at gmail.com
Mon May 3 17:17:12 EDT 2010
I agree with the previous comment. If MPLS/LDP is already enabled, check to
make sure your LDP sessions are working correctly. Do show mpls ldp neighbor
-Yuri
On Mon, May 3, 2010 at 12:04 PM, Shimol Shah <shimshah at cisco.com> wrote:
> Is MPLS/LDP enabled and up between the two boxes ? Notice the outgoing
> "untagged" in the global LFIB on both boxes. I would have expected a
> "imp-null" due to PHP
>
> "sh mpls int <> int" on two boxes may tell you more.
>
>
>
>
> On 5/3/10 2:14 PM, selamat pagi wrote:
>
>> Setup
>> CE (loopback 3 on R3 vrf BLUE ) - PE1 R3 - MPLS -- PE2 R4 -- CE
>> (loopback4 on R4 vrf BLUE
>>
>> *ping between lo 3 and lo 4 does not work. *
>> both lo are in vrf BLUE
>>
>> - vrf routing table show routes / vpnv4 BGP neigbor is up
>>
>> R3#sh ip route vrf BLUE
>> !
>> 3.0.0.0/32 is subnetted, 1 subnets
>> C 3.3.3.3 is directly connected, Loopback3
>> 4.0.0.0/32 is subnetted, 1 subnets
>> B 4.4.4.4 [200/0] via 150.1.4.4, 00:07:27
>>
>>
>> R3#sh ip bgp vpnv4 all su
>> !
>> Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down
>> State/PfxRcd
>> 150.1.4.4 4 100 15 16 5 0 0 00:09:52
>>
>>
>>
>> Such a simple setup, but I just cannot figure out what's wrong.
>> Any feedback is highly welcome :-)
>>
>> cheers, keti
>>
>> Configuration / sh outputs
>> ------------------------------------
>> R3
>> ip vrf BLUE
>> rd 1:100
>> route-target export 1:100
>> route-target import 1:100
>> !
>> interface Loopback3
>> ip vrf forwarding BLUE
>> ip address 3.3.3.3 255.255.255.255
>> router bgp 100
>> no synchronization
>> bgp log-neighbor-changes
>> neighbor 150.1.4.4 remote-as 100
>> neighbor 150.1.4.4 update-source Loopback0
>> no auto-summary
>> !
>> address-family vpnv4
>> neighbor 150.1.4.4 activate
>> neighbor 150.1.4.4 send-community both
>> exit-address-family
>> !
>> address-family ipv4 vrf BLUE
>> redistribute connected
>> no auto-summary
>> no synchronization
>> exit-address-family
>>
>>
>> R4
>>
>> ip vrf BLUE
>> rd 1:100
>> route-target export 1:100
>> route-target import 1:100
>>
>> interface Loopback4
>> ip vrf forwarding BLUE
>> ip address 4.4.4.4 255.255.255.255
>>
>> router bgp 100
>> no synchronization
>> bgp log-neighbor-changes
>> neighbor 150.1.3.3 remote-as 100
>> neighbor 150.1.3.3 update-source Loopback0
>> no auto-summary
>> !
>> address-family vpnv4
>> neighbor 150.1.3.3 activate
>> neighbor 150.1.3.3 send-community both
>> exit-address-family
>> !
>> address-family ipv4 vrf BLUE
>> redistribute connected
>> no auto-summary
>> no synchronization
>> exit-address-family
>> !
>>
>>
>> R3#sh ip cef vrf BLUE 4.4.4.4 det
>> 4.4.4.4/32, version 2, epoch 0, cached adjacency to Serial2/0
>> 0 packets, 0 bytes
>> tag information set
>> local tag: VPN-route-head
>> fast tag rewrite with
>> Recursive rewrite via 150.1.4.4/32, tags imposed {19}
>> via 150.1.4.4, 0 dependencies, recursive
>> next hop 150.1.13.1, Serial2/0 via 150.1.4.4/32
>> valid cached adjacency
>> tag rewrite with
>> Recursive rewrite via 150.1.4.4/32, tags imposed {19}
>>
>>
>> R3#sh mpls forwarding-table
>> Local Outgoing Prefix Bytes tag Outgoing Next Hop
>> tag tag or VC or Tunnel Id switched interface
>> 16 Untagged 150.1.24.0/24 0 Se2/0 point2point
>> 17 Untagged 150.1.4.4/32 0 Se2/0 point2point
>> 18 Untagged 150.1.12.0/24 0 Se2/0 point2point
>> 19 Aggregate 3.3.3.3/32[V] <http://3.3.3.3/32%5BV%5D> 0
>> R3#
>> R4#sh mpls forwarding-table
>> Local Outgoing Prefix Bytes tag Outgoing Next Hop
>> tag tag or VC or Tunnel Id switched interface
>> 16 Untagged 150.1.3.3/32 0 Se2/0.1 point2point
>> 17 Untagged 150.1.13.0/24 0 Se2/0.1 point2point
>> 18 Untagged 150.1.12.0/24 0 Se2/0.1 point2point
>> 19 Aggregate 4.4.4.4/32[V] <http://4.4.4.4/32%5BV%5D> 0
>> R4#
>>
>> R4#sh ip cef vrf BLUE 3.3.3.3
>> 3.3.3.3/32, version 2, epoch 0, cached adjacency to Serial2/0.1
>> 0 packets, 0 bytes
>> tag information set
>> local tag: VPN-route-head
>> fast tag rewrite with
>> Recursive rewrite via 150.1.3.3/32, tags imposed {19}
>> via 150.1.3.3, 0 dependencies, recursive
>> next hop 150.1.24.2, Serial2/0.1 via 150.1.3.3/32
>> valid cached adjacency
>> tag rewrite with
>> Recursive rewrite via 150.1.
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