Re: MPLS tagging issue

Command output from each router follows. It seems to me that 3.3.3.3 does
appear to be an address bound between R2 and R3.

R3#sh mpls ldp neigh
    Peer LDP Ident: 10.10.10.2:0; Local LDP Ident 10.10.10.3:0
        TCP connection: 10.10.10.2.646 - 10.10.10.3.43726
        State: Oper; Msgs sent/rcvd: 380/381; Downstream
        Up time: 05:25:30
        LDP discovery sources:
          Serial0/0, Src IP addr: 10.10.10.2
        Addresses bound to peer LDP Ident:
          10.10.10.2 2.2.2.2
R2#sh mpls ldp neigh
    Peer LDP Ident: 10.10.10.3:0; Local LDP Ident 10.10.10.2:0
        TCP connection: 10.10.10.3.43726 - 10.10.10.2.646
        State: Oper; Msgs sent/rcvd: 381/380; Downstream
        Up time: 05:25:52
        LDP discovery sources:
          Serial0/0, Src IP addr: 10.10.10.3
* Addresses bound to peer LDP Ident:
          10.10.10.3 3.3.3.3
* Peer LDP Ident: 4.4.4.4:0; Local LDP Ident 10.10.10.2:0
        TCP connection: 4.4.4.4.646 - 10.10.10.2.56602
        State: Oper; Msgs sent/rcvd: 66/67; Downstream
        Up time: 00:50:37
        LDP discovery sources:
          Serial0/0, Src IP addr: 10.10.10.4
        Addresses bound to peer LDP Ident:
          10.10.10.4 10.10.15.4 4.4.4.4

R4#sh mpls ldp neigh
    Peer LDP Ident: 10.10.15.5:0; Local LDP Ident 4.4.4.4:0
        TCP connection: 10.10.15.5.49240 - 4.4.4.4.646
        State: Oper; Msgs sent/rcvd: 68/69; Downstream
        Up time: 00:52:39
        LDP discovery sources:
          Serial0/0.45, Src IP addr: 10.10.15.5
        Addresses bound to peer LDP Ident:
          10.10.15.5 5.5.5.5
    Peer LDP Ident: 10.10.10.2:0; Local LDP Ident 4.4.4.4:0
        TCP connection: 10.10.10.2.56602 - 4.4.4.4.646
        State: Oper; Msgs sent/rcvd: 68/67; Downstream
        Up time: 00:51:13
        LDP discovery sources:
          Serial0/0.42, Src IP addr: 10.10.10.2
        Addresses bound to peer LDP Ident:
          10.10.10.2 2.2.2.2

R5#sh mpls ldp neigh
    Peer LDP Ident: 4.4.4.4:0; Local LDP Ident 10.10.15.5:0
        TCP connection: 4.4.4.4.646 - 10.10.15.5.49240
        State: Oper; Msgs sent/rcvd: 69/69; Downstream
        Up time: 00:52:57
        LDP discovery sources:
          Serial0/0.54, Src IP addr: 10.10.15.4
        Addresses bound to peer LDP Ident:
          10.10.10.4 10.10.15.4 4.4.4.4
On Thu, Jun 24, 2010 at 3:34 PM, Tyson Scott <tscott_at_ipexpert.com> wrote:

> What is the output of show mpls ldp neighbors? Is R3 sending the Lo to R4
> as a route it is sending labels for?
>
> Regards,
>
> Tyson Scott - CCIE #13513 R&S, Security, and SP
> Managing Partner / Sr. Instructor - IPexpert, Inc.
> Mailto: tscott_at_ipexpert.com
>
>
>
> -----Original Message-----
> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
> Brian Buxton
> Sent: Thursday, June 24, 2010 3:30 PM
> To: CCIE Groupstudy
> Subject: MPLS tagging issue
>
> Hello all,
>
> I am having trouble with a loopback not being tagged by a P router. R3 Lo0
> can ping R5 Lo0, however the CE on vrf RED attached to R3 cannot ping the
> CE
> on vrf RED attached to R5 even though the networks are making it to both PE
> BGP tables. I think I have narrowed the issue to a P router (R4) that has
> no CE attached. It does not appear to be tagging the R3 Lo0. This seems
> to
> permit BGP to propogate, but break the actual traffic between the VRFs. I
> am including "sh ip bgp vpnv4 vrf RED" on both R3 and R5 as well as "sh
> mpls
> forwarding-table" on R2 and R4. Note the line in the R4 output that reads
> "18 Untagged 3.3.3.3/3 ..." This is what leads me to believe the
> problem lies on either R2 or R4. Any guidance is appreciated.
> Thank you,
> Brian
>
> R3 - R2 - R4 - R5
>
> R3 Lo0 = 3.3.3.3
> R5 Lo0 = 5.5.5.5
>
> R3#sh ip bgp vpnv4 vrf RED
> BGP table version is 237, local router ID is 10.10.10.3
> 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
> Route Distinguisher: 65080:70 (default for vrf RED)
> *>i6.6.6.6/32 5.5.5.5 0 100 0 65060 i
> *>i7.7.7.7/32 2.2.2.2 0 100 0 65070 i
> *> 8.8.8.8/32 192.168.80.2 0 0 65080 i
> *>i160.100.100.0/24 5.5.5.5 0 100 0 65060 i
> *>i160.110.110.0/24 5.5.5.5 0 100 0 65060 i
> *>i160.120.120.0/24 5.5.5.5 0 100 0 65060 i
> *>i170.100.100.0/24 2.2.2.2 0 100 0 65070 i
> *>i170.110.110.0/24 2.2.2.2 0 100 0 65070 i
> *>i170.120.120.0/24 2.2.2.2 0 100 0 65070 i
> *> 180.100.100.0/24 192.168.80.2 0 0 65080 i
> *> 180.110.110.0/24 192.168.80.2 0 0 65080 i
> *> 180.120.120.0/24 192.168.80.2 0 0 65080 i
> *>i192.168.60.0 5.5.5.5 0 100 0 65060 i
> *>i192.168.70.0 2.2.2.2 0 100 0 65070 i
> r> 192.168.80.0 192.168.80.2 0 0 65080 i
>
> R5#sh ip bgp vpnv4 vrf RED
> BGP table version is 252, local router ID is 10.10.15.5
> 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
> Route Distinguisher: 65080:70 (default for vrf RED)
> *> 6.6.6.6/32 192.168.60.2 0 0 65060 i
> *>i7.7.7.7/32 2.2.2.2 0 100 0 65070 i
> *>i8.8.8.8/32 3.3.3.3 0 100 0 65080 i
> *> 160.100.100.0/24 192.168.60.2 0 0 65060 i
> *> 160.110.110.0/24 192.168.60.2 0 0 65060 i
> *> 160.120.120.0/24 192.168.60.2 0 0 65060 i
> *>i170.100.100.0/24 2.2.2.2 0 100 0 65070 i
> *>i170.110.110.0/24 2.2.2.2 0 100 0 65070 i
> *>i170.120.120.0/24 2.2.2.2 0 100 0 65070 i
> *>i180.100.100.0/24 3.3.3.3 0 100 0 65080 i
> *>i180.110.110.0/24 3.3.3.3 0 100 0 65080 i
> *>i180.120.120.0/24 3.3.3.3 0 100 0 65080 i
> r> 192.168.60.0 192.168.60.2 0 0 65060 i
> *>i192.168.70.0 2.2.2.2 0 100 0 65070 i
> *>i192.168.80.0 3.3.3.3 0 100 0 65080 i
>
> R2#sh mpls forwarding-table
> Local Outgoing Prefix Bytes tag Outgoing Next Hop
> tag tag or VC or Tunnel Id switched interface
> 16 Pop tag 10.10.15.0/24 0 Se0/0 10.10.10.4
> 17 Untagged 170.120.120.0/24[V] \
> 0 Fa0/0 192.168.70.2
> 18 Untagged 170.110.110.0/24[V] \
> 0 Fa0/0 192.168.70.2
> 19 Untagged 170.100.100.0/24[V] \
> 684 Fa0/0 192.168.70.2
> 20 Untagged 7.7.7.7/32[V] 1254 Fa0/0 192.168.70.2
> 21 16 5.5.5.5/32 0 Se0/0 10.10.10.4
> 22 Pop tag 3.3.3.3/32 0 Se0/0 10.10.10.3
> 23 Pop tag 4.4.4.4/32 0 Se0/0 10.10.10.4
>
> R4#sh mpls forwarding-table
> Local Outgoing Prefix Bytes tag Outgoing Next Hop
> tag tag or VC or Tunnel Id switched interface
> 16 Pop tag 5.5.5.5/32 872 Se0/0.45 point2point
> 17 Pop tag 2.2.2.2/32 598 Se0/0.42 10.10.10.2
> *18 Untagged 3.3.3.3/32 0 Se0/0.42 10.10.10.3*
>
>
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Received on Thu Jun 24 2010 - 16:10:10 ART