From: john matijevic (matijevi@bellsouth.net)
Date: Sun Oct 31 2004 - 21:00:09 GMT-3
Hello Anand,
The command is required on R6 fastethernet because its receiving
broadcasts, and by default the router will drop the directed broadcast,
so we have to enabled it on that interface, because that is where it
will receive the directed broadcasts from R1, with R5, it will actually
receive the multicast traffic, so the command would not be necessary on
R5, this issue has actually been discussed before with using the
multicast helper command, if you search the archives you should be able
to find more information. Make sure you turn on the debugs on R6 and
R5, so you can see the udp broadcast to 520, and see the rip route on
R5.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/
fipras_r/1rfipadr.htm#wp1018109
Sincerely,
John Matijevic, CCIE #13254, MCSE, CNE, CCEA
CEO
IgorTek Inc.
151 Crandon Blvd. #402
Key Biscayne, FL 33149
Hablo Espanol
305-321-6232
http://home.bellsouth.net/p/PWP-CCIE
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
AK Singh
Sent: Sunday, October 31, 2004 5:45 PM
To: Group Study
Subject: Multicast : CCIE practice LAB3
Hi,
This lab talks about carrying the rip v1 broadcast in a multicast. I
am drawing a little topology here for others who may not have access
to the book.
R1
|
|
|Fa0/0
R6----------------(Vi1)---R5
R5 is supposed to get a RIP v1 update from R1 which is running RipV1.
R6 and and R5 are running dense-mode multicast. In the solution it
converts broadcast at R6 into multicast 224.9.9.9 udp and then at R5
this multicast is converted to broadcast again to subnet of R5's
virtual-template. I understand this.
The piece which i don't understand is enabling "ip directed-broadcast"
at R6 fa0/0 interface and R5's virtual-template 1.
What i undestand is that its required only when a router is supposed
to brroadcast a packet on some segment when it receives a subnetted
broadcast. Comments please?
Thanks
-Anand
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