From: Ovidiu Neghina (o.neghina@gmail.com)
Date: Sun Jun 03 2007 - 05:24:58 ART
about multicast
it depends what kind of the pim are you running
pim dense mode - is the push and prune model; the ping to a multicast
address will flow to all pim dense enabled interfaces, if there is no host
that wants that multicast stream then all the routers will prune that stream
pim sparse mode - this is the join and pull model , here is a little more
complicated as we have the RP : If you have pim sparse-mode configured on
all interfaces then the first packet is sent encapsulated as unicast to the
RP by the first router near the source, if the RP has information about a
host wanting to receive that multicast stream then it decapsulate the packet
and sends to the shortest path tree (that was built by join message) ; if
the RP does not have info about a host wanting to receive that multicast
stream then it just sends back to the first router a Register Stop message -
Stop router ! I don't need your multicast stream!
You might want to read this configuration guide about multicast
http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cg/himc_c/mcbcncpt.htm
I did not understand the RIP question
10x
Ovidiu
On 6/3/07, Raj Bansal <ccie_study06@yahoo.com> wrote:
>
> Mcast: If you got IP multicast turned up on a switch/router. Now you issue
> ping simulating it as a source, what interface do these pings leave on? I
> would assume it would be all the multicast interfaces but want to confirm.
>
> RIP: Does RIP v2 or RIP in general allow to summarize without contributing
> routes?
>
> Thanks.
>
> Raj
>
>
>
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