Show MPLS label stack

December 10, 2006 at 6:35 pm | Posted in Blogroll, MPLS, Traffic Engineering, VPN | Leave a comment

Bellow outputs are for VPN scenario

 
PE1#sh mpls forwarding-table vrf Customer_A 
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop 
tag    tag or VC   or Tunnel Id      switched   interface 
19     Untagged    10.1.1.16/28[V]   0          Se0/1      point2point 
20     Untagged    10.1.1.49/32[V]   0          Se0/1      point2point 
21     Aggregate   150.1.1.16/28[V]  0 
PE1#sh mpls forwarding-table vrf Customer_A 150.1.2.16 detail 
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop 
tag    tag or VC   or Tunnel Id      switched   interface 
None   16          150.1.2.16/28     0          Se0/3      point2point 
        MAC/Encaps=4/12, MRU=1496, Tag Stack{16 20} 
        0F008847 0001000000014000 
        No output feature configured 
    Per-packet load-sharing 
PE1#sh mpls forwarding-table vrf Customer_B 
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop 
tag    tag or VC   or Tunnel Id      switched   interface 
22     Untagged    10.2.1.16/28[V]   0          Se0/0      point2point 
23     Untagged    10.2.1.49/32[V]   0          Se0/0      point2point 
24     Aggregate   150.1.1.32/28[V]  0       

PE1#sh mpls forwarding-table vrf Customer_B 150.1.2.32 detail 
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop 
tag    tag or VC   or Tunnel Id      switched   interface 
None   16          150.1.2.32/28     0          Se0/3      point2point 
        MAC/Encaps=4/12, MRU=1496, Tag Stack{16 16} 
        0F008847 0001000000010000 
        No output feature configured 
    Per-packet load-sharing  

PE1#sh mpls forwarding-table 192.168.1.33 detail 
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop 
tag    tag or VC   or Tunnel Id      switched   interface 
18     16          192.168.1.33/32   0          Se0/3      point2point 
        MAC/Encaps=4/8, MRU=1500, Tag Stack{16} 
        0F008847 00010000 
        No output feature configured 
    Per-packet load-sharing  

In the above scenario the first label, 16, is for the loopback address of the router PE2, second (bottom) label 20 and 16 are for identifying VPN Customer_A and Customer_B respectively.

In the below scenario, MPLS is used for Traffic Engineering purpose.

7200a#show mpls forwarding 13.13.13.13 detail 
Local  Outgoing    Prefix            Bytes tag  Outgoing   Next Hop 
tag    tag or VC   or Tunnel Id      switched   interface 
45     12326       13.13.13.13/32    0          PO3/0      point2point 
        MAC/Encaps=4/8, MTU=4470, Tag Stack{12326} 
        FF030281 03026000 
        No output feature configured 
    Per-destination load-sharing, slots: 0 2 4 6 8 10 12 14 
       43          13.13.13.13/32    0          Tu1        point2point 
        MAC/Encaps=4/12, MTU=4466, Tag Stack{12335 43}, via PO3/0 
        FF030281 0302F0000002B000 
        No output feature configured 
    Per-destination load-sharing, slots: 1 3 5 7 9 11 13 15       

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