3825 VLAN support for onboard GE interfaces?

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Mar 14th, 2007
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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

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Amit Singh Wed, 03/14/2007 - 22:14
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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

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