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H3C Technologies H3C S10500 Series Switches User Manual

Page 152

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5.

Verify the configuration

Perform the display mpls te tunnel command on Switch A. You can see that two tunnels are present with

the outgoing interface being VLAN-interface 1 and VLAN-interface 4 respectively. This indicates that a

backup CR-LSP was created upon creation of the primary CR-LSP.

[SwitchA] display mpls te tunnel

LSP-Id Destination In/Out-If Name

1.1.1.9:6 3.3.3.9 -/Vlan1 Tunnel1

1.1.1.9:2054 3.3.3.9 -/Vlan4 Tunnel1

Perform the display mpls te tunnel path command on Switch A to identify the paths that the two tunnels
traverse:

[SwitchA] display mpls te tunnel path

Tunnel Interface Name : Tunnel1

Lsp ID : 1.1.1.9 :6

Hop Information

Hop 0 10.1.1.1

Hop 1 10.1.1.2

Hop 2 2.2.2.9

Hop 3 20.1.1.1

Hop 4 20.1.1.2

Hop 5 3.3.3.9

Tunnel Interface Name : Tunnel1

Lsp ID : 1.1.1.9 :2054

Hop Information

Hop 0 30.1.1.1

Hop 1 30.1.1.2

Hop 2 4.4.4.9

Hop 3 40.1.1.1

Hop 4 40.1.1.2

Hop 5 3.3.3.9

Perform the tracert command to draw the picture of the path that a packet must travel to reach the tunnel
destination.

[SwitchA] tracert –a 1.1.1.9 3.3.3.9

traceroute to 3.3.3.9(3.3.3.9) 30 hops max,40 bytes packet

1 10.1.1.2 25 ms 30.1.1.2 25 ms 10.1.1.2 25 ms

2 40.1.1.2 45 ms 20.1.1.2 29 ms 40.1.1.2 54 ms

The sample output shows that the current LSP traverses Switch B but not Switch D.
Shut down VLAN-interface 2 on Switch B. Perform the tracert command on Switch A to draw the path to

the tunnel destination. The output shows that the LSP is re-routed to traverse Switch D:

[SwitchA] tracert –a 1.1.1.9 3.3.3.9

traceroute to 3.3.3.9(3.3.3.9) 30 hops max,40 bytes packet

1 30.1.1.2 28 ms 27 ms 23 ms

2 40.1.1.2 50 ms 50 ms 49 ms

Perform the display mpls te tunnel command on Switch A. You can see that only the tunnel traversing
Switch D is present:

[SwitchA] display mpls te tunnel