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MLS for non-IP

MSFC support MLS. With MLS IP traffic same destination|source goes thru the MSFC(MLS-RP) once (with ip access-list applied) and all the rest via the Switching Engine (MLS-SE).

Question: If I turn on bridging with access-list applied (sap access-list 200-299). Does it goes thru the same flow as the MLS feature. Once thru the MSFC and the rest via Switching Engine. There is a performance issue if there is a lot of VLANs bridge together (70 or more) bottle-neck on the MSFC.


Re: MLS for non-IP

No, MLS is only for IP, Multicast IP, and IPX. All bridged traffic that goes through the MSFC must be software switched. As you noted, this can lead to performance problems with excessive number of bridge interfaces.

In order to minimize the impact of this issue, use a different Spanning-tree protocol on the MSFC that the rest of the network. For example, use vlan-bridge Spanning-tree. In this manner, you will still have seperate Spanning-tree instances per VLAN and should mimimize the amount of bridge traffic that must go through the MSFC.