Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

Identifying Multicast Groups

When I perform a "show ip igmp groups" on my Catalyst 4507, I see the following:

Cat4507R_Lab_Admn#sh ip igmp groups

IGMP Connected Group Membership

Group Address Interface Uptime Expires Last Reporter

224.0.1.40 Vlan101 2w3d 00:02:22 10.1.101.254

239.255.219.45 Vlan101 6d11h 00:02:27 10.1.101.120

224.0.1.60 Vlan101 2w3d 00:02:25 10.1.101.199

225.78.86.83 Vlan101 1w0d 00:02:31 10.1.101.148

239.255.255.250 Vlan101 2w3d 00:02:22 10.1.101.183

239.255.255.253 Vlan101 2w3d 00:02:30 10.1.101.125

While I understand that most of these are reserved or local scoped multicast group addresses, I have not been able to identify what most of them actually are except for:

224.0.1.40 cisco-rp-discovery

224.0.1.60 says hp-device-disc, but that's not really what it is.

Would be grateful for feedback/ideas!

Thank you!

  • WAN Routing and Switching
1 REPLY
Silver

Re: Identifying Multicast Groups

RFC 2365 reserves 239.0.0.0 space as administratively scoped. Just like RFC 1918. You can use it for any purpose.

IANA list for reserved multicast addresses can be found at:

http://www.iana.org/assignments/multicast-addresses

Thanks.

341
Views
0
Helpful
1
Replies
This widget could not be displayed.