01-31-2006 05:46 AM - edited 03-03-2019 01:38 AM
I have problem with mac address learning on C3750. I need to connect two vlans on the same C3750 by external L2 box (IPS device). This box provides mapping between vlans on trunk ports. Connection is depicted below:
int vlan 370 (L3 svi interface)
|
g1/0/20 (trunk with vlan 370)
|
external box, maps vlan 370 to vlan 361
|
g1/0/19 (trunk with vlan 361)
|
another switch
|
PC (in vlan 361)
But this does not work. C3750 refuses to learn mac address from L3 interface vlan 370 on interface g1/0/19 in vlan 361. When I use command 'mac-address-table static xxxx.xxxx.xxxx vl 361 int g1/0/19' all is working correctly. But I can not use this, because mac address of SVI interface changes after each C3750 reload.
Any suggestions are greatly appreciated.
01-31-2006 10:08 AM
I'm not sure how the external L2 box works, but maybe you have to use the 'native vlan' command on Gi1/0/19 and -20 with 370 and 361 as native vlans?
(The native vlan is transmited untagged in a trunk)
I'm not really confident about this but maybe you want to give it a try...
02-01-2006 02:58 AM
That box supports 802.1Q and provides mapping from tag 370 to tag 361.
In fact I need to connect more than one vlan thru, so native vlan is not usable.
I guess that C3750 refuses to learn mac address pertaining to int vlan 370 from external wire.
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