Maximum Number of Mac-Addresses a 3750 switch can Support

Unanswered Question
Dec 8th, 2008

Does anyone know how to find out the maximum number of mac-addresses a 3750 switch can support?

I have this problem too.
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Jon Marshall Mon, 12/08/2008 - 12:58

To add to Collin's post, also depends on the SDM template you use -

MAC Addresses

• Desktop Default SDM template: 6K

• Desktop Routing SDM template: 3K Desktop VLAN SDM template: 12K

• Aggregator Default SDM template: 6K Aggregator Routing SDM template: 6K

• Aggregator VLAN SDM template: 12K

• WS-C3750G-12S Aggregator VLAN SDM template: 20K

Full link - http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps5023/prod_qas09186a00801b0971.html

L2 performance table near the bottom.

Jon

yuchenglai Mon, 12/08/2008 - 13:11

Think I have found a way to get this figure. Please confirm that this is the correct way.

At the end of a "show mac address-table" output is:

Total Mac Addresses for this criterion: 2074

The end of a "show mac address-table" output is:

Total Mac Address Space Available: 3456

Adding the two figures above yields 5530

Would this be one way to find out the maximum number of mac addresses a 3750 switch can support?

Collin Clark Mon, 12/08/2008 - 13:37

You're probably using the default SDM template which is 6K (per Jon). show sdm prefer will show you what template you're using.

Hope that helps.

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