From: ccie2be (ccie2be@nyc.rr.com)
Date: Wed May 04 2005 - 06:50:47 GMT-3
Dan,
On shared media, there are 3 functions where it must be decided which router
will perform that function since you don't these functions performed more
than once.
These functions are:
DR --- determines which rtr sends joins/prunes up the tree
Querier -- determines which rtr queries hosts for group membership
Forwarder -- determines which rtr forwards mcast traffic onto shared media
The best source I've seen that describes how the selection process works is
the Beau Williamson book, Developing IP Multicast Networks.
The determination of which rtr will perform which function depends on a
couple factors including which version of igmp is running and ip addressing.
HTH, Tim
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Danshtr
Sent: Wednesday, May 04, 2005 2:47 AM
To: Cisco certification
Subject: Multicast DR...
Hello
Reading through multicast documentation, they are mentioning DR and
queriers which both are intended for deciding which router will
forward multicast packets to the recievers.
But i couldn't find how the routers, on a shared media, decide which
one will forward the packets from the source.
Does anyone here knows the answer? I am sure there is... because it works!
-- Best regards, Dan
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