Switch won't encapsulate! Help!

Unanswered Question
Sep 13th, 2007

When I try and do some basic encapsulation functions on my new switch, it won't allow it; in fact, it doesn't even give the option at the "?" option where it should exist. I can't do VLANs and set trunking to the router. Can someone assist? Someone had told me that I just needed to update flash or something. If so, I could use some advice. Below is the output of "show version":

Cisco Internetwork Operating System Software

IOS (tm) C2900XL Software (C2900XL-HS-M), Version 11.2(8.10)SA6, MAINTENANCE INT

ERIM SOFTWARE

Copyright (c) 1986-1902 by cisco Systems, Inc.

Compiled Fri 15-Feb-02 09:47 by devgoyal

Image text-base: 0x00003000, data-base: 0x0020E278

ROM: Bootstrap program is C2900XL boot loader

Switch uptime is 10 minutes

System restarted by power-on

System image file is "flash:c2900XL-hs-mz-112.8.10-SA6.bin", booted via

cisco WS-C2924C-XL (PowerPC403GA) processor (revision 0x11) with 4096K/640K byte

s of memory.

Processor board ID 0x09, with hardware revision 0x00

Last reset from power-on

Processor is running Enterprise Edition Software

Cluster member switch capable

24 Ethernet/IEEE 802.3 interface(s)

32K bytes of flash-simulated non-volatile configuration memory.

Base ethernet MAC Address: 00:90:B1:91:8B:80

Motherboard assembly number: 73-2911-06

Motherboard serial number: FAA02359GZE

System serial number: FAA0237W09A

Configuration register is 0xF

Switch#

I have this problem too.
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Kevin Dorrell Thu, 09/13/2007 - 05:20

Could you post a terminal log of what happens if you do:

conf t

int f0/1

switchport mode trunk

switchport trunk encap?

Kevin Dorrell

Luxembourg

crunchyhippo Thu, 09/13/2007 - 05:45

I can, but I'll have to wait until tonight - about eight or nine more hours from now.

paul.matthews Fri, 09/14/2007 - 02:27

As Kevin says, a log of the output would be helpful. My first comment may be less so :-(

The 2924XL is now an obsolete switch, and support will be difficult to obtain, so really you should be looking at upgrading. They are OK for a little playing in a lab, but even for that they are an early IOS based switch and do not support quite a few of the newer features.

Having said that, 2900XLs do support VLANs and trunking, but IIRC they only support one mode - I can't remember if they support ISL or dot1q. It may be that only supporting he one mode may be causing your confusion.

Kevin Dorrell Fri, 09/14/2007 - 03:18

Paul,

Surprisingly, the 2900XL supported both isl and dot1q, but the (later) 2950-12 supported dot1q only. So the 2950 has no switchport trunk encapsulation command. For me, that was the big red flag that said the days of ISL were numbered.

Kevin Dorrell

Luxembourg

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