This blog was originally started to better help me understand the technologies in the CCIE R&S blueprint; after completing the R&S track I have decided to transition the blog into a technology blog.

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Wednesday, May 19, 2010

Question 118

What does "ip multicast-routing distributed" provide?

1 comments:

Packets Analyzed said...

Before MDS (multicast distributed switching) IP multicast traffic was always switched at the Route Processor (RP)

The disadvantages of switching multicast traffic at the RP are:
-Load on the RP
-Performance was limited to what a single RP could switch.

MDS solves these problems by performing distributed switching of multicast packets received at the line cards.

MDS is accomplished using a forwarding data structure called a Multicast Forwarding Information Base (MFIB), which is a subset of the routing table. A copy of MFIB runs on each line card and is always kept up to date with the RP's MFIB table.

To enable MDS do the following:
config#ip multicast-routing distributed

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