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mpls traceroute problems

  • From: "Amos Rosenboim" <r.amos@zahav.net.il>
  • Date: Thu, 11 Sep 2003 02:46:34 +0200
  • Resent-Date: Wed, 10 Sep 2003 20:26:31 -0400
  • X-OriginalArrivalTime: 11 Sep 2003 00:46:35.0301 (UTC) FILETIME=[26CF1550:01C377FE]

Hi,

I have a problem with mpls tracerote.

My topology is:


Pe (cisco 7200)--------fastethernet----→P(cisco7400)------Oc3POS-------→ASBR(cisco12008)---------Oc3POS---→upstream provider (inter-as mpls vpn).
                           213.8.43.8/30                                       213.8.45.220/30                            63.218.13.12/30

The problem is that when I trace from the PE router to the upstream provider connected ip address ( 63.218.13.13)
I get the following output:


PNV4#traceroute 63.218.13.13

Type escape sequence to abort.
Tracing the route to 63.218.13.13

  1  *  *  * 
  2  *  *  * 
  3 63.218.13.13 148 msec *  148 msec
VPNV4#
Note: this address routing is in a /32 because of a bgp created host route in the gsr.

When tracing to other addresses which I have igp routing to, there is no problem and the traceroute looks just fine:

VPNV4#traceroute 192.116.202.99

Type escape sequence to abort.
Tracing the route to 192.116.202.99

  1 213.8.43.10 [MPLS: Label 340 Exp 0] 4 msec 0 msec 0 msec
  2 213.8.45.221 [MPLS: Label 14963 Exp 0] 328 msec 4 msec 0 msec
  3 192.117.180.9 200 msec 0 msec 4 msec
  4 192.116.202.99 0 msec 0 msec 0 msec
VPNV4#


Routing and mpls label information looks ok to me.

7200 PE label info:
VPNV4#sh mpls forwarding-table 63.218.13.13
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop    
tag    tag or VC   or Tunnel Id      switched   interface              
3705   3700        63.218.13.13/32   0          Fa0/0      213.8.43.10  
VPNV4#

7400 P label info:
PXF#sh mpls forwarding-table 63.218.13.13
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop    
tag    tag or VC   or Tunnel Id      switched   interface              
3700   15331       63.218.13.13/32   600        PO1/0      point2point  
PXF#

12008 ASBR label info:
Eden#sh mpls forwarding-table 63.218.13.13 
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop    
tag    tag or VC   or Tunnel Id      switched   interface              
15331  Pop tag     63.218.13.13/32   1692       PO0/3      point2point  
Eden#


What makes it even stranger to me is that if I traceroute inside the vrf, it seems ok:
VPNV4#traceroute vrf PCCW-TEST 10.1.1.3

Type escape sequence to abort.
Tracing the route to 10.1.1.3

  1 213.8.43.10 [MPLS: Labels 3700/536 Exp 0] 156 msec 156 msec 156 msec
  2 213.8.45.221 [MPLS: Labels 15331/536 Exp 0] 156 msec 156 msec 156 msec
  3 63.218.13.13 [MPLS: Label 536 Exp 0] 156 msec 156 msec 152 msec
  4 63.218.12.89 [MPLS: Labels 185/1055 Exp 0] 156 msec 156 msec 156 msec
  5 63.218.12.38 [MPLS: Labels 12675/1055 Exp 0] 156 msec 156 msec 160 msec
  6 63.216.0.29 [MPLS: Labels 13233/1055 Exp 0] 156 msec 156 msec 156 msec
  7 10.1.1.14 [MPLS: Label 1055 Exp 0] 148 msec 148 msec 148 msec
  8 10.1.1.13 152 msec *  152 msec
VPNV4#


Any suggestions and explanations will be appreciated.

Regards
Amos Rosenboim


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