So I've been spending a lot of time on multicasting and today was playing with
the deployment of AutoRP within a FR Cloud. I have my RP at the hub site, with
my MA deployed at a spoke. Straight away I ran into issues with my MA
announcements, on 224.0.1.40, being sent to my other spoke routers, to the hub
site no issues. Note, that this was intended to further cement my understanding
of frame-relay concepts and also mcast.
Now my thought process was that the 224.0.1.40 annoucements are not getting to
my spoke, they are being sent to the hub who is not forwarding them on. I then
remembered that these announcements are sent to your PIM neighbours only, and
my initial thought was that enabling autorp listener on the hub would resolve
the issue. Alas no, would like someone to explain this.
Second though, ok I need to get the spokes to become neighbours, I configured
frame-relay map ip statements, with the broadcast command, between my spokes
but again no result.
Final thought, setup a GRE tunnel between them and configure PIM on the tunnel,
with the required static mroute to fix my RFP failure, result worked.
So going back I'm now a little confused about points 1 and 2. Clearly I've got
a gap in my theory.
1. AutoRP listener, causes the router to flood autorp messages within the
environment, so why not from the hub down to spokes? I configured no ip split
horizon on the interface thinking is it a split horizon issue, but this is for
routing right? so a red herring?
2. With the frame-relay map statements, why didn't my spokes become neighbours?
I have broadcast statements so the packets would have been unicasted out?
I've read that the MA SHOULD be placed at the hub, so it has full
communication. Short of using a GRE tunnel is this my only option? There has to
be an alternative, what am I missing.
Thanks
Bal
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