28.06.2014 Views

Discussion

Discussion

Discussion

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

Solution<br />

On the ingress router, look in the inet.3 routing table to view the RSVP routes:<br />

aviva@R1> show route table inet.3<br />

inet.3: 1 destinations, 1 routes (1 active, 0 holddown, 0 hidden)<br />

+ = Active Route, - = Last Active, * = Both<br />

10.0.0.6/32 *[RSVP/7] 00:17:28, metric 2<br />

> via so-0/0/2.0, label-switched-path R1-to-R6<br />

On the transit router, look in the mpls.0 table to see the router’s label information:<br />

aviva@R3> show route table mpls.0<br />

mpls.0: 7 destinations, 7 routes (7 active, 0 holddown, 0 hidden)<br />

+ = Active Route, - = Last Active, * = Both<br />

0 *[MPLS/0] 06:28:10, metric 1<br />

Receive<br />

1 *[MPLS/0] 06:28:10, metric 1<br />

Receive<br />

2 *[MPLS/0] 06:28:10, metric 1<br />

Receive<br />

100048 *[RSVP/7] 05:55:24, metric 1<br />

> via so-0/0/2.0, label-switched-path R6-to-R1<br />

100048(S=0) *[RSVP/7] 05:55:24, metric 1<br />

> via so-0/0/2.0, label-switched-path R6-to-R1<br />

100064 *[RSVP/7] 00:18:59, metric 1<br />

> via so-0/0/3.0, label-switched-path R1-to-R6<br />

100064(S=0) *[RSVP/7] 00:18:59, metric 1<br />

> via so-0/0/3.0, label-switched-path R1-to-R6<br />

<strong>Discussion</strong><br />

MPLS and RSVP store their routing and forwarding information in two routing tables,<br />

inet.3 and mpls.0. The inet.3 table contains the routers learned from the signaling<br />

protocol, RSVP (and also LDP), which MPLS uses to make forwarding decisions.<br />

The show route table inet.3 command lists the routes to RSVP-signaled LSP. You<br />

can also use the show route protocol rsvp command to display the same information:<br />

aviva@R1> show route protocol rsvp<br />

inet.0: 14 destinations, 18 routes (14 active, 0 holddown, 0 hidden)<br />

inet.3: 1 destinations, 1 routes (1 active, 0 holddown, 0 hidden)<br />

+ = Active Route, - = Last Active, * = Both<br />

10.0.0.6/32 *[RSVP/7] 00:32:04, metric 2<br />

> via so-0/0/2.0, label-switched-path R1-to-R6<br />

The inet.0 unicast routing table doesn’t contain any routes learned from RSVP, and<br />

the inet.3 table has one route, to 10.0.0.6, the LSP’s egress router. The second line<br />

of the routing entry shows that the path to the egress router goes out the so-0/0/2<br />

interface and travels along LSP R1-to-R6. The detail version of both show route commands<br />

gives more information about the route and LSP:<br />

aviva@R1> show route table inet.3 detail<br />

inet.3: 1 destinations, 1 routes (1 active, 0 holddown, 0 hidden)<br />

10.0.0.6/32 (1 entry, 1 announced)<br />

Viewing Information About RSVP-Signaled LSPs in the Routing Tables | 513<br />

This is the Title of the Book, eMatter Edition<br />

Copyright © 2008 O’Reilly & Associates, Inc. All rights reserved.

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!