From: Victor Cappuccio (cvictor@protokolgroup.com)
Date: Sun Mar 26 2006 - 10:53:24 GMT-3
Petr, thanks for the explanation, could you please go a little bit int
detail in points 1 and 2, when running pim sparse over H&S,
What if I'm not allowed to move the MA to another place? the ip mroute
will be sufficient??
and in point 2 I thought that the problem would be if Multicast Client
Router to the MAgent fails the RPF Check
Many Thanks
Victor.
Petr Lapukhov escribis:
-- Sorry, repating e-mail to group address
Hello David,
If you run PIM Dense mode over FR H&S topology, you basically
face an OLIST problem when you try to reach group joined on spoke
from another spoke.
Hub won't forward mpacket on the same interface it was received from.
This problem could be solved with single tunnel (either R1-R2, R2-R3, R1-R3)
and proper static mroute on _receiving_ side of the tunnel (to prefer tunnel
over
physical interface for sure).
Now if you run PIM Sparse over H&S, you may face the same problem,
and more.
1) You may miss BSR/AutoRP announces due to OLIST problem.
2) You may be unable to join shared tree if RP is places improperly (spoke)
3) You may face OLIST problem with mpacket delivery (the same as above).
Leaving 1,2 aside, lets look at 3.
For that mpacket OLIST problem, you may basically:
1) use tunnel/mroute, as in PIM-DM
2) use "pim nbma-mode" on hub multipoint interface,
3) enable PIM bidir mode to use bidirectional shared tree and place RP on
hub
HTH
Petr
2006/3/26, david robin <robindavi@gmail.com> :
dear all,
I want to very something with ip multicast, if we have a frame-relay
connection, R1 is the hub connected wih a multipoint interface to r2 and
r3
the spokes, the qusetion is if we had a multicast group on r2 fast
ethernet
( using ip igmp join), the fact that I cant ping this multicast group from
r3, does i have to configure tunnels ( 1 tunnel between r1 and r2 and 1
tunnel between r1 and r3) in order to make the multicast packets flow ??
Also there is another question in case i run pim sparse-dense as r1 is the
RR the same problem will occur and does i have to configure tunnel too ???
_______________________________________________________________________
Subscription information may be found at: http://www.groupstudy.com/list/CCIELab.html
_______________________________________________________________________
Subscription information may be found at: http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Sat Apr 01 2006 - 10:07:40 GMT-3