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DAvelarNIC
Beginner

MRT Add/Update

Hello everyone,

I am seeing these entries on our core switch. Can someone explain what this means and if this is a problem. It is logging this just about every 3-5 seconds.

Thanks

                  

Jun 12 15:15:25: IGMP(0): Send v2 Report for 224.0.1.39 on Vlan108

Jun 12 15:15:25: IGMP(0): Received v2 Report on Vlan108 from 10.52.8.1 for 224.0.1.39

Jun 12 15:15:25: IGMP(0): Received Group record for group 224.0.1.39, mode 2 from 10.52.8.1 for 0 sources

Jun 12 15:15:25: IGMP(0): Updating EXCLUDE group timer for 224.0.1.39

Jun 12 15:15:25: IGMP(0): MRT Add/Update Vlan108 for (*,224.0.1.39) by 0 Jun 12 15:15:25: IGMP(0): Send v2 Report for 224.0.1.39 on Vlan108
Jun 12 15:15:25: IGMP(0): Received v2 Report on Vlan108 from 10.52.8.1 for 224.0.1.39
Jun 12 15:15:25: IGMP(0): Received Group record for group 224.0.1.39, mode 2 from 10.52.8.1 for 0 sources
Jun 12 15:15:25: IGMP(0): Updating EXCLUDE group timer for 224.0.1.39
Jun 12 15:15:25: IGMP(0): MRT Add/Update Vlan108 for (*,224.0.1.39) by 0

2 ACCEPTED SOLUTIONS

Accepted Solutions
smitesh kharecha
Contributor

Hi,

That are Multicast debugs output...

Issue command "show debugs" to check if somebody left debugs on before logout..

Once done, do "un all" to disable all debugs..

HTH,

Smitesh

PS: Please rate helpful posts...

View solution in original post

David Salazar
Beginner

Hi,

The first question is, do you have multicast applications on your network?

The specific debug that your device has is "debug ip igmp".

IGMP is automatically enable on your network device when you enable '''ip multicast-routing"

Additionally you have enable Auto-RP for PIM-Sparse-Mode becauses this protocol use the reserved multicast address 224.0.1.39.

Can you look for commands on your device like this

ip pim send-rp-announce Loopback0 scope 3

ip pim send-rp-discovery Loopback0 scope 3

HTH.

PSL Please rate helpful posts

View solution in original post

3 REPLIES 3
smitesh kharecha
Contributor

Hi,

That are Multicast debugs output...

Issue command "show debugs" to check if somebody left debugs on before logout..

Once done, do "un all" to disable all debugs..

HTH,

Smitesh

PS: Please rate helpful posts...

David Salazar
Beginner

Hi,

The first question is, do you have multicast applications on your network?

The specific debug that your device has is "debug ip igmp".

IGMP is automatically enable on your network device when you enable '''ip multicast-routing"

Additionally you have enable Auto-RP for PIM-Sparse-Mode becauses this protocol use the reserved multicast address 224.0.1.39.

Can you look for commands on your device like this

ip pim send-rp-announce Loopback0 scope 3

ip pim send-rp-discovery Loopback0 scope 3

HTH.

PSL Please rate helpful posts

We have multi-cast enabled on the network since we have IP speakers located through out for bells and announcments. This is a school disctrict.

Thanks for your assistance! It turns out that someone did turn on the debug for IGMP.