connecting a non-Cisco unmanaged switch to the Phone PC port

Unanswered Question

We have clients who have asked about connecting both Cisco Catalyst and/or non-cisco unmanaged switches to the Phone PC (ethernet) port, and then connecting other devices to the switches. Will this configuration work, what would be the limitations, and most important will Cisco TAC this type of topology and connection.

I have this problem too.
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gogasca Tue, 07/14/2009 - 00:08

Yes it may work but Cisco IP Phone was not designed to cascade switches.

we work with 3rd party vendors, we support it but thats real poor design, is there any reason why u want to use PC port to cascade switches?

Jonathan Schulenberg Tue, 07/14/2009 - 07:00

This is definitively not supported. The main limitation will be the phone's CAM table is not intended to track this many associations. I believe it has an internal limit of 32 addresses but I can't find this document at the moment.


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