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Switchport mapper not discovering MACs

I have four 3Com 7757 switches connected to a Cisco 6509 ( I know, don't say it). When I use the switchport mapper, the device MACs on two of the switches are discovered, while the other two are not. As a result, all I get on the latter two is port status, but no MAC address, IP address or DNS. I have checked the configs, and they are the same, also ran a ping sweep to ensure the ARP table of my router was populated, but to no avail. I have upgraded to 9.1 already. Any thoughts on this?

Thanks in advance.

Joe

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Mithrilhall

I would double check your SNMP strings to make sure they are correct.

jainsworth

The strings for all of the devices are the same, and I can talk to the devices via SNMP, it just doesn't do the MAC discovery, hence I don't get information other that port status and speed.

Mithrilhall

Do you know the exact OID for the mac-address-table on the switches? If you do a manual snmpwalk of the OID do you see the table on all the switches?