IOS to support sub-interface

Unanswered Question
Aug 27th, 2008

Hi guys,

I have a cisco 12416 and 12406 which uses ios 12.0. It doesnt support sub-interface to be used for VLAN tags. What recommended IOS to support this?


I have this problem too.
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Jon Marshall Wed, 08/27/2008 - 23:37


I don't have a lot of experience of the 12000 routers but from the 12000 Q&A

Q. Is Inter-Switch Link (ISL) or 802.1q encapsulation supported on the Gigabit Ethernet (GE) or Fast Ethernet (FE) Line Cards (LCs)?

A. Cisco IOS Software Release 12.0(6) introduced support for 802.1q on GE interfaces only. 802.1q encapsulation is supported on all the GE LCs. The 12000 Series Internet Router does not support ISL encapsulation, and no support is planned.


Giuseppe Larosa Thu, 08/28/2008 - 00:41

Hello Jefferson,

I can define 802.1Q subifs on 4GE ISE linecard with


download c12kprp-k4p-mz.120-32.S7.bin or later.

on a C12410

Hope to help



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