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Verifying Your Work

To verify proper operation of Layer 2 circuits, use the following commands:

ping mpls l2circuit interface interface-name
ping mpls l2circuit virtual-circuit virtual-circuit-id neighbor ip-address
show l2circuit connections

Options: [brief] | [down] | [extensive] | [history] | [instance] | [local-site] | [remote-site] |[status] | [summary] | [up] | [up-down]
show interfaces
show route table l2circuit.0
show ldp database l2circuit detail

This is what the operational command output looks like for cell-relay mode on Router PE1:

user@PE1> show l2circuit connections

Layer-2 Circuit Connections:

Legend for connection status (St)
EI -- encapsulation invalid      NP -- interface not present
MM -- mtu mismatch               Dn -- down
EM -- encapsulation mismatch     VC-Dn -- Virtual circuit Down
CM -- control-word mismatch      Up -- operational
OL -- no outgoing label          XX -- unknown
NC -- intf encaps not CCC/TCC

Legend for interface status
Up -- operational
Dn -- down

Neighbor: 10.255.17.4
    Interface                 Type  St     Time last up          # Up trans
    at-0/1/0.0 (vc 32)        rmt   Up     Jan 22 15:15:52 2003           1
      Local interface: at-0/1/0.0, Status: Up, Encapsulation: ATM CELL (VC Mode)
      Remote PE: 10.255.17.4, Negotiated control-word: Yes (Non-null)
      Incoming label: 100000, Outgoing label: 100000

user@PE1>  show route table l2circuit.0 detail

l2circuit.0: 2 destinations, 2 routes (2 active, 0 holddown, 0 hidden)
10.255.17.4:CtrlWord:9:32:Local/96 (1 entry, 1 announced)
         *L2CKT   Preference: 7
                Next hop: via so-0/2/0.0 weight 1, selected
                Label-switched-path PE1-PE2
                Protocol next hop: 10.255.17.4 Indirect next hop: 85135e8 367
                State: <Active Int>
                Local AS:    69 
                Age: 2:34 
                 Task: l2 circuit
                Announcement bits (1): 0-LDP 
                AS path: I
                VC Label 100000, MTU 0,  cell-bundle size 80

10.255.17.4:CtrlWord:9:32:Remote/96 (1 entry, 1 announced)
         *LDP     Preference: 9
                Next hop type: Discard
                State: <Active Int>
                Local AS:    69 
                Age: 28:11 
                 Task: LDP
                Announcement bits (1): 1-l2 circuit 
                AS path: I
                VC Label 100000, MTU 0,  cell-bundle size 80

user@PE1>  show interfaces at-0/1/0.0 extensive
  Logical interface at-0/1/0.0 (Index 66) (SNMP ifIndex 40) (Generation 4)
    Flags: Point-To-Point SNMP-Traps  Encapsulation: ATM-CCC-Cell-Relay
     L2 circuit cell bundle size: 10 , bundle timeout: 125 usec, timeout count: 0
    L2 circuit out-of-sequence count: 0
    Traffic statistics:
[...]

user@PE1>  show interfaces media at-0/1/0
Physical interface: at-0/1/0, Enabled, Physical link is Up
 Interface index: 154, SNMP ifIndex: 50
 Link-level type: ATM-CCC-Cell-Relay,  MTU: 4482, Clocking: Internal, SONET mode,
 L2 circuit mode: Cell, Speed: OC12, Loopback: None
[...]

user@PE1>  show ldp database l2circuit detail
Input label database, 10.255.17.2:0--10.255.17.4:0
    Label     Prefix
   100000     L2CKT CtrlWord ATM CELL (VC Mode) VC 32
              Cell bundle size: 80
              State: Active
              Age: 9:48

Output label database, 10.255.17.2:0--10.255.17.4:0
    Label     Prefix
   100000     L2CKT CtrlWord ATM CELL (VC Mode) VC 32
              Cell bundle size: 80
              State: Active
              Age: 9:48

This is what the operational command output looks like on Router PE1 if AAL5 mode is used:

user@PE1> show l2circuit connections

Layer-2 Circuit Connections:

Legend for connection status (St)   
EI -- encapsulation invalid      NP -- interface not present
MM -- mtu mismatch               Dn -- down
EM -- encapsulation mismatch     VC-Dn -- Virtual circuit Down
CM -- control-word mismatch      Up -- operational
OL -- no outgoing label          XX -- unknown
NC -- intf encaps not CCC/TCC

Legend for interface status
Up -- operational
Dn -- down

Neighbor: 10.255.17.4
    Interface                 Type  St     Time last up          # Up trans
    at-1/2/0.0 (vc 32)        rmt   Up     Feb 18 18:00:00 2003           1
      Local interface: at-1/2/0.0, Status: Up, Encapsulation: ATM AAL5
      Remote PE: 10.255.17.4, Negotiated control-word: Yes (Non-null)
      Incoming label: 100016, Outgoing label: 100032

user@PE1> show interfaces media at-0/1/0
Physical interface: at-0/1/0, Enabled, Physical link is Up
 Interface index: 154, SNMP ifIndex: 50
 Link-level type: ATM-PVC, MTU: 4482, Clocking: Internal, SONET mode,
 L2 circuit mode: AAL5, Speed: OC12, Loopback: None, Payload scrambler: Enabled
[...]

user@PE1>  show interfaces at-1/2/0.0 extensive
  Logical interface at-1/2/0.0 (Index 68) (SNMP ifIndex 40) (Generation 38)
    Flags: Point-To-Point SNMP-Traps  Encapsulation: ATM-CCC-VCMUX
    L2 circuit out-of-sequence count: 0
    Traffic statistics:[...]

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