C-4
Cisco 12000/10700 v3.1.1 Router Manager User Guide
OL-4455-01
Appendix C Investigating LSP Black Holes Using Cisco 12000 Series Router Manager
Setup
This shows t hat the o ut-g oing l abel i s now a pop t ag, and he nce t he pa cket s are n o lo nger sen t ou t
untagg ed. This means that the top label fo r the BGP next hop will be popped as the packet s traverse the
router, but the packe ts will still have the second VPN label.
And more importantly, you can ping from CE1 to CE2.
If yo u re -ru n th e sho w mpls for war ding-t abl e 10 .5.5.5 command, you will see results similar to
Table C-2:
Note See http://www.cisco.com/warp/customer/105/troubleshoot_mpls_vpn.html for bac kgr ound
information.

Running Configs

CE1

!
version 12.0
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
no service single-slot-reload-enable
!
hostname cl-7505-1
!
boot system flash flash:cl-7505-1-confgNewTest
redundancy
no keepalive-enable
no logging buffered
no logging console
enable password atlantech
!
username lab password 0 amaf
username mozart password 0 amaf
ip subnet-zero
ip cef
no ip domain-lookup
no mpls traffic-eng auto-bw timers frequency 0
file prompt noisy
!
!
!
!
interface Serial2/0/0
no ip address
no ip directed-broadcast
!
Table C-2 Example Output
tag tag o r VC or Tunnel Id Switc hed Inter f ac e
12306 Pop ta g 10.2.2.2 /32 23675 Gi4/1 10.6. 6. 2
12307 Pop ta g 10.5.5.5 /32 365 Gi1/0 10.8. 8. 5