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IGMP error in Cisco swicth

smartboy2255
Level 1
Level 1

HI all,

   I am getting below error in my cisco switch in trunk port...

%MCAST-5-RX_IGMPREPORT: IGMP: Rcvd IGMP Report 01-00-5e-00-00-fb on 5/1..

Kindly help to reslve the issue..

Thanks a lot in advance..

Regards,

Ajith

1 Accepted Solution

Accepted Solutions

Somasundaram Jayaraman
Cisco Employee
Cisco Employee

Hi,

The messages you are receiving are informational only and are generated

when the switch receives IGMP report packets with a multicast MAC address that starts with 01-00-5e-00-00-xx.

This Layer 2 range of addresses is equivalent to a Layer 3 multicast

address range between 224.0.0.0 and 224.0.0.255.

These addresses are reserved for the use of routing protocols and other low-level topology discovery or maintenance protocols, such as gateway discovery and group membership reporting. 

So, since these are addresses from a private range , sniff the interfae 5/1 out the traffic and find out what device is originating the frames.

This does not mean anything is wrong with the switch, these packets floating around from a

rogue PC or server.

You can set a span session to capture traffic on port 5/1 and look for the packet with mac address

01-00-5e-00-00-fb

Inorder to suppress these error messages from appearing in logs, we can use the below command in catos.

The command is "set logging level mcast 5 default"

Hope this helps

Cheers

Somu

Pls rate helpful posts

View solution in original post

2 Replies 2

Jon Marshall
Hall of Fame
Hall of Fame

Ajith

This is not an error message. It is simply an informational message that an IGMP report has been seen on interface 5/1.

There is in effect nothing to resolve.

Jon

Somasundaram Jayaraman
Cisco Employee
Cisco Employee

Hi,

The messages you are receiving are informational only and are generated

when the switch receives IGMP report packets with a multicast MAC address that starts with 01-00-5e-00-00-xx.

This Layer 2 range of addresses is equivalent to a Layer 3 multicast

address range between 224.0.0.0 and 224.0.0.255.

These addresses are reserved for the use of routing protocols and other low-level topology discovery or maintenance protocols, such as gateway discovery and group membership reporting. 

So, since these are addresses from a private range , sniff the interfae 5/1 out the traffic and find out what device is originating the frames.

This does not mean anything is wrong with the switch, these packets floating around from a

rogue PC or server.

You can set a span session to capture traffic on port 5/1 and look for the packet with mac address

01-00-5e-00-00-fb

Inorder to suppress these error messages from appearing in logs, we can use the below command in catos.

The command is "set logging level mcast 5 default"

Hope this helps

Cheers

Somu

Pls rate helpful posts