From: Don (seadon@attbi.com)
Date: Fri Oct 11 2002 - 11:35:06 GMT-3
You can not do ISL on a 10mbit interface. You can do dot1q
encapsulation. A major problem with doing dot1q encapsulation with a 2500
is that the Ethernet interface will then no longer support an MTU of 1500
because of a hardware limitation. The maximum MTU needs to be decreased to
something like 1497 (I'm not sure about the exact size but I seem to
remember dot1q adds 3 bytes to the frame).
Another major problem is that you need at least a 3620 before you have
the necessary mls commands on the router.
Don
----- Original Message -----
From: "Jung, Jin" <jin.jung@lmco.com>
To: <ccielab@groupstudy.com>
Sent: Thursday, October 10, 2002 9:48 PM
Subject: router on a stick
> Need to setup router on a stick with 2520
>
> Will not take "encapsulation" command on "e 0.21" sub interface.
>
> switch port is ISL trunk
>
> What am I missing?
>
> r1>en
> r1#conf t
> Enter configuration commands, one per line. End with CNTL/Z.
> r1(config)#int e 0.21
> r1(config-subif)#encap
> r1(config-subif)#encap
> r1(config-subif)#encap?
> % Unrecognized command
> r1(config-subif)#encap
> ^
> % Invalid input detected at '^' marker.
>
> r1(config-subif)#
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