Cisco Systems 12000/10700 V3.1.1 Running Configs, Tag Tag or VC Or Tunnel Id Switched Interface

Appendix C Investigating LSP Black Holes Using Cisco 12000 Series Router Manager

Setup

This shows that the out-going label is now a pop tag, and hence the packets are no longer sent out untagged. This means that the top label for the BGP next hop will be popped as the packets traverse the router, but the packets will still have the second VPN label.

And more importantly, you can ping from CE1 to CE2.

If you re-run the show mpls forwarding-table 10.5.5.5 command, you will see results similar to Table C-2:

Table C-2 Example Output

tag	tag or VC	or Tunnel Id	Switched	Interface
12306	Pop tag	10.2.2.2/32	23675	Gi4/1 10.6.6.2
12307	Pop tag	10.5.5.5/32	365	Gi1/0 10.8.8.5

Note See http://www.cisco.com/warp/customer/105/troubleshoot_mpls_vpn.html for background 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
	!
		Cisco 12000/10700 v3.1.1 Router Manager User Guide
C-4		OL-4455-01