09-02-2009 07:31 AM - edited 03-06-2019 07:32 AM
Hi,
I have a point-to-point WAN connection connecting site1 to site2. I want to allow multicasts to go from site1 to site2, but want to control what multicast travels down the WAN. My question is will an igmp access group do this for me?
Please see my example config's below:
Site1:
interface GigabitEthernet1/4
ip address 10.25.20.9 255.255.255.252
ip pim sparse-mode
ip igmp access-group wan-igmp
exit
ip access-list standard wan-igmp
permit 233.119.160.128 0.0.0.127
exit
Site2:
interface GigabitEthernet1/20
ip address 10.25.20.10 255.255.255.252
ip pim sparse-mode
ip igmp access-group wan-igmp
exit
ip access-list standard wan-igmp
permit 233.119.160.128 0.0.0.127
exit
09-02-2009 07:42 AM
IGMP ACLs restricts hosts not Multicast groups. You need the command IP Multicast Boundary
http://www.cisco.com/en/US/docs/ios/ipmulti/command/reference/imc_03.html#wp1029655
HTH,
__
Edison
09-03-2009 05:52 AM
Hi
Thanks for that. What does it mean by IGMP ACL's retrict hosts? Can you please give me an example.
Thanks
Dan
09-03-2009 06:14 AM
Hello Dan,
if having ip pim sparse-dense mode on the interfaces traffic for a group not associated to a RP is treated as dense mode and uses a "flood and prune" strategy: it is sent before an explicit join is done.
the ip igmp join-group command using an ACL filters igmp joins from end user PCs so it can limit what sparse mode groups can travel on the link.
Edit:
I see that you have ip pim sparse-mode so your setup should be effective.
Hope to help
Giuseppe
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