3825 VLAN support for onboard GE interfaces?

mike_owen · ‎03-14-2007

I've got a 3825 running 12.4(12). Can I place the two onboard GE interfaces (GE0/0 and GE0/1) into a VLAN and assign an IP address to that interface? It looks like no, but I haven't been able to find a definitive answer.

I can get into the VLAN database, but the regular IOS VLAN commands don't work (e.g., int vlan 100).

Are VLANs only supported on the 3825 with the EtherSwitch modules?

Thanks,

--Mike

Amit Singh · ‎03-14-2007

Mike,

You cannot do that. Both the interfaces are layer 3 interfaces and you can make them L2 and assign to a VLAN. You use those interfaces to trunk to some layer 2 switch and does the inter-vlan routing for you.

For example:

router#config t

router(config)#int g0/0

router(config)#no ip address

router(config)#no vlan-id dot1q 300

router(config)#int g0/0.300

router(config)#description ***VLAN300 subinterface***

router(config)#ip address x.x.x.x x.x.x.x

router(config)#encapsulation dot1q 300

router(config)#no shut

router(config)#int g0/0.400

router(config)#description ***VLAN400 subinterface***

router(config)#ip address x.x.x.x x.x.x.x

router(config)#encapsulation dot1q 400

router(config)#no shut

HTH,please rate if it does.

-amit singh