3Com MSR 50 Series Configuration Manual page 1408

1408 C 77: MPLS TE C
HAPTER
n
ONFIGURATION
[RouterA] display mpls te tunnel path
Tunnel Interface Name : Tunnel3
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 : Tunnel3
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.
[RouterA] 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 Route B but not Router D.
Shut down interface Ethernet 1/1 on Router B. Perform the tracert command on
Router A to draw the path to the tunnel destination. You can see that the LSP is
re-routed to traverse Router D:
[RouterA] 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
2 40.1.1.2 50 ms
Perform the display mpls te tunnel command on Router A. You can find that
only the tunnel traversing Router D is present:
[RouterA] display mpls te tunnel
LSP-Id
1.1.1.9:2054
Configuring ordinary CR-LSP backup is almost the same as configuring hot CR-LSP
backup except that you need to replace the mpls te backup hot-standby
command with the mpls te backup ordinary command. Unlike in hot CR-LSP
backup where a secondary tunnel is created immediately upon creation of a
primary tunnel, in ordinary CR-LSP backup, a secondary CR-LSP is created only
after the primary LSP goes down.
6 Create a static route for routing MPLS TE tunnel traffic
[RouterA] ip route-static 3.3.3.9 32 tunnel 3 preference 1
27 ms 23 ms
50 ms 49 ms
Destination In/Out-If
3.3.3.9 -/POS5/1
Name
Tunnel3