Maximum Number of Mac-Addresses a 3750 switch can Support

[yuchenglai]

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

[Collin Clark]

From the datasheet-

Configurable up to 12,000 MAC addresses (Cisco Catalyst 3750G-24TS, 3750G-24WS, 3750G-24T, 3750G-12S, 3750-24TS, 3750-24FS, 3750-24PS, 3750-48TS, 3750-48PS, 3750G-24TS-1U, 3750G-24PS, 3750G-48TS, 3750G-48PS, and 3750G-16TD)

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps5023/product_data_sheet0900aecd80371991.html

Hope that helps.

[Jon Marshall]

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

[Collin Clark]

Good point Jon.

[yuchenglai]

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]

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.