July 2002
Intermediate to advanced
608 pages
14h 52m
English
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TE and Multicast
Multicast packets are not sent over TE tunnels, but over the underlying physical infrastructure. This can cause problems with multicast's Reverse-Path Forwarding (RPF) lookup when autoroute is enabled.
Multicast does its forwarding by doing an RPF lookup on the source address of every multicast packet. It forwards that packet only if it came in on the interface that the routing table says is the shortest path to the source.
The problem with this and TE, though, is that if you enable autoroute, your routing table points to a bunch of routes out a TE tunnel, but packets never come in on TE tunnels! Multicast breaks! Bad!
With autoroute disabled, things look like Example 10-14.
Example 10-14. Routing and RPF Information with No ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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