From: Scott, Tyson C (tyson.scott@hp.com)
Date: Fri Mar 05 2004 - 00:48:40 GMT-3
Here is an example of how to do it. You have a broadcast you want
forwarded to another subnet from R1 ethernet0 to R2 Ethernet0 and the
port of the broadcast is going to be 5959. I think it makes better
sense seeing a good example than the wrong example that is shown on the
doc CD.
e0-R1-s0->s0-R2-e0
R1#
ip multicast-routing
ip forward protocol udp 5959
!
Interface Ethernet0
Ip address 10.1.1.1 255.255.255.0
Ip pim dense-mode
- enable multicast routing on the interface
Ip multicast helper-map broadcast 239.39.39.39 115
- map the broadcast to a multicast
Ip directed-broadcast
- accept the broadcast defined
!
interface Serial0
ip address 10.2.2.1 255.255.255.0
ip pim dense-mode
!
access-list 115 permit any any eq 5959
- define which port you are going to accept as a directed broadcast
!
end
R2#
ip multicast-routing
ip forward protocol udp 5959
!
Interface Ethernet0
Ip address 10.3.3.3 255.255.255.0
Ip pim dense-mode
- enable multicast routing on the interface
Ip directed-broadcast
- accept the broadcast defined
!
interface Serial0
ip address 10.2.2.2 255.255.255.0
Ip multicast helper-map 239.39.39.39 10.2.2.255 115
- map the multicast to a broadcast
ip pim dense-mode
!
access-list 115 permit any any eq 5959
!
end
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
braet_kamiel@nl.ibm.com
Sent: Thursday, March 04, 2004 4:30 AM
To: ccielab@groupstudy.com
Subject: ip multicast helper-map - ip directed broadcast
Looking at the "ip multicast helper" example on the Doc CD reachable
via:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/
fipr_c/ipcpt3/1cfmulti.htm#1003511
I don't understand how the directed broadcast, created from the
multicast stream at the incoming interface of the last hop router, is
sent out on the outgoing interface as physical broadcast using default
interface configuration.
Because this interface will just drop the directed broadcast arriving at
the interface. In order to prevent this from happening the command "ip
directed broadcast should" be configured on the outgoing interface of
the last hop router.
Since this example doesn't say anything about that, I'm still wondering
if this is correct, could somebody confirm this?
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