"switch" frame depending on mac destination and source port

[Toug31]

Hi,

I'am trying to make a CISCO 2960 configuration. This switch will be connected to equipment and an other network. I need it to switch the frames depending on 2 parameters.

First the mac destination of the frame. I know how to do it with the command

mac address-table static 0300.0000.1595 vlan 1 interface FastEthernet 0/23

for example.

But I need also to specify the source port of the cisco in the command because a frame with same dest mac may be received from 2 port and the receiver port will not be the same.

Something like

mac address-table static 0300.0000.1595 vlan 1 interface FastEthernet 0/23 source_port FastEthernet 0/21

mac address-table static 0300.0000.1595 vlan 1 interface FastEthernet 0/19 source_port FastEthernet 0/18

or if I could specify different vlan for each port, and not allowing frame to be switched between specific vlan?

hence I should see 2 different entries in the "show mac address-table".

Thanks.

[Simon Darlington]

Hi

If I understand what you're asking, you wish to switch a frame for the same destination mac address out of different switchports, conditional on the switchport the frame has come in on. The issue is that the mac address-table can only have one entry for a unique mac address reachable out a switchport per vlan. 

In your example static entries i notice you have two pairs of src/dst switchports.

1. if traffic towards dst mac 0300.0000.1595 is received on fa0/21 send out fa0/23

2. if traffic towards dst mac 0300.0000.1595 is received on fa0/18 send out fa0/19

If this is the case then you can put each pair of ports in a different vlan, which will allow you to have a static entry for the same mac-address per vlan. So switchports fa0/21 and fa0/23 are configured in vlan 1; switchports fa0/18 and fa0/19 in vlan 2. We don't need to worry about the source switchport now, as we have separated the switching between ports at L2. 

Example:

mac address-table static 0300.0000.1595 vlan 1 interface FastEthernet 0/23

mac address-table static 0300.0000.1595 vlan 2 interface FastEthernet 0/19

Hope this helps. Please rate if it does.

[Toug31]

I'm not sure but I don't think that's possible. Groups of ports (ie vlan in your proposal) will not be always the same depending on the mac dest.