creating sub interface with 3750G switch

Unanswered Question
Feb 4th, 2008

Hi I would like to create subinterfaces with 3750g series switch. pls let me know the IOS version supporting the same feature.

I have this problem too.
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a.rooprao Mon, 02/04/2008 - 16:58

Pls help.....

is there any alternate command to create sub interfaces with gig ports as it does not supports the command " int gig1/0/1.1 "

ilnaiduccna Mon, 02/04/2008 - 20:29

Hi roop,

enter the fallowing commands hope it will be clear you,

Switch-01#conf t

Switch-01#int GE0/1/2

Switch-01#description ******aaaaaaa******

Switch-01#switchport trunk encapsulation dot1q

Switch-01#switchport mode trunk

Regards,

Naidu :-)

jorgenolla Mon, 02/04/2008 - 17:33

I don't think the 3750 support subinterfaces as per command:

int gi1/0/1.1

You would usually communicate with subinterfaces on a router with a trunk port and specific vlans for each broadcast domain. Otherwise known as Router-On-A-Stick.

Best Regards

jorgenolla Mon, 02/04/2008 - 17:41

Got some more information from the configuration guide, that confirms my suspicion.

From the configuration guide:

"A routed port behaves like a regular router interface, except that it does not support VLAN subinterfaces."

Here is the link for the configuration guide:

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3750/12244se/scg/swint.htm#wp1810955

Again your solution is Router-On-A-Stick, for inter-vlan communication, or SVIs.

Best Regards

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