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New Member

Cisco cat. 6509 routing problems

We have a cat 6509 with an MSFC, we have different subnets in one VLAN, and within the MSFC associate to that VLAN we have 3 IP Address. The problem is that when we trie to route packets from une subnet to the other, the packes are distribuited over all the ports degradating the performance of the switch. All the ports are Gigabit.

How can I resolve the problem ? Can it be a problem with CEF or with mls ?

We have SW version 5.5(2) for the switch and IOS 12.1(2)E for the MSFC.

Cisco Employee

Re: Cisco cat. 6509 routing problems

I am not sure you what you mean by "the packets are distributed over all the ports degrading peformance." Do you mean that you are seeing unicast packets on ports that do not have the connected device?

If so, review the following link:

This is not likely a CEF, mls or switch problem. It may just be topology or configuration issue (not a wrong configuration, but not an optimal config).

I would not be runing 12.1(2)E on my MSFC. I would look at later release. The same goes for 5.5.(2).

New Member

Re: Cisco cat. 6509 routing problems

Yes, we have packets in ports that are not the ports connected with the affected devices......

I just resolve the problem...we have an AIX with two Gigabit interfaces, the AIX have the default gateway in one of the interfaces and when we make a request to the other interface, the first one is the one that responds, causing the switch to broadcast the packes to all the ports.

We are going to solve the problem configuring an etherchannel between the AIX and the switch with just one IP address.