03-13-2009 04:31 AM - edited 03-06-2019 04:34 AM
Hi
I'm new to multicasting so I'm confused about the following. When I run "Show ip mroute" I get the following:
(10.45.8.34, 239.255.3.20), 11:28:59/00:02:53, flags: TA
Incoming interface: Vlan8, RPF nbr 0.0.0.0, RPF-MFD
Outgoing interface list:
Vlan11, Forward/Sparse, 00:57:11/00:02:23, H
(10.45.8.35, 239.255.3.20), 11:28:57/00:02:53, flags: TA
Incoming interface: Vlan8, RPF nbr 0.0.0.0, RPF-MFD
Outgoing interface list:
Vlan11, Forward/Sparse, 00:57:11/00:02:23, H, A
(10.45.8.36, 239.255.3.20), 11:29:01/00:02:53, flags: TA
Incoming interface: Vlan8, RPF nbr 0.0.0.0, RPF-MFD
Outgoing interface list:
Vlan11, Forward/Sparse, 00:57:11/00:02:23, H, A
As far as I can see vlan 8 is sourcing the traffic and for some strange reason sending it through to vlan 11. Can some one explain why that would happen and what kind of filter I can place to stop multicast jumping between vlan 8 and vlan 11 both ways?
Thanks in advance.
Dan
03-13-2009 06:55 AM
Hi Dan,
Are you running PIM on your Vlan 11 interface? What's the output of
sh ip pim neighbor
sh ip pim rp
sh ip pim interface
sh run int vlan 11
There must be a multicast reciever downstream that is requesting these groups as you're using sparse mode.
03-13-2009 07:08 AM
Hello Dan,
>> what kind of filter I can place to stop multicast jumping between vlan 8 and vlan 11 both ways?
for stopping all multicast traffic you need to go to interface vlan 11 and you need to disable pim
int vlan 11
no ip pim sparse-mode
be aware that at least another multicast capable router/switch exists in vlan 11 because the A flag means assert winner
so you need to do so also on SVI vlan11 of the other router
if you want to stop only traffic from 239.x.y.z from entering vlan 11
ip igmp access-group xx
xx standard acl that can deny 239 range
again in both routers
if out vlan11 there are downstream routers you need
ip multicast boundary access-list [filter-autorp]
see
http://www.cisco.com/en/US/docs/ios/ipmulti/command/reference/imc_03.html#wp1029655
use sh ip pim interface
sh ip pim neighbors
to find out pim neighbors in vlan11
Hope to help
Giuseppe
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