How to troubleshoot slow powerconnect 62xx management interface

Posted by Hannes on Server Fault See other posts from Server Fault or by Hannes
Published on 2012-12-17T15:45:22Z Indexed on 2012/12/18 23:04 UTC
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Filed under:

networking

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switch

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dell-powerconnect

Our Dell Powerconnect 62xx switches have a very high packetloss on the management interface. I presume this is caused by a new appliance which uses multicast for communication but I am not sure.

Our network setup is following:

servers a -> Dell PC6248 |
servers b -> Dell PC6248 |-> juniper core router
servers c -> Dell PC6248 |

What we see is that the multicast traffic arrives at all servers (but only the servers b use the multicast) and I fear that this multicast traffic floods the switch management interface.

The switches' management interfaces are reachable via vlan101, all other traffic is sent over other vlans. When I tcpdump on one of the 2 servers with a vlan 101 ip address, I only get a few arp requests but almost nothing. When I try to ping between these 2 servers, it works like a charm.

I would like to know what a good way is to troubleshoot this problem and maybe help me understand what is going wrong on that subnet.

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