4900M Port Configuration

Unanswered Question
Sep 3rd, 2008

Are you able to do a switchport trunk encapsulation dot1q command under a port. I am not seeing it.

I have this problem too.
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spremkumar Wed, 09/03/2008 - 05:39


AFAIK 4900 series switches supports the command, in which ios version you are trying this commmand ?


bryantvalencia Wed, 09/03/2008 - 07:44

I don't think it supports anything but dot1q so it's on by default.


interface GigabitEthernet2/9

switchport mode trunk


interface GigabitEthernet2/10


interface GigabitEthernet2/11

switchport access vlan 172

switchport mode access


4900M#show ver

Cisco IOS Software, Catalyst 4500 L3 Switch Software (cat4500e-IPBASEK9-M), Version 12.2(40)XO, RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2008 by Cisco Systems, Inc.

Compiled Tue 22-Jan-08 21:39 by prod_rel_team

Image text-base: 0x10000000, data-base: 0x11D8D84C

ROM: 12.2(44r)SG

Darkside Revision 0, Jawa Revision 11, Tatooine Revision 140, Forerunner Revision 1.71

4900M uptime is 7 weeks, 19 hours, 4 minutes

System returned to ROM by power-on

System image file is "bootflash:cat4500e-ipbasek9-mz.122-40.XO.bin"

This product contains cryptographic features and is subject to United

States and local country laws governing import, export, transfer and

use. Delivery of Cisco cryptographic products does not imply

third-party authority to import, export, distribute or use encryption.

Importers, exporters, distributors and users are responsible for

compliance with U.S. and local country laws. By using this product you

agree to comply with applicable laws and regulations. If you are unable

4900M#show inter trunk

Port Mode Encapsulation Status Native vlan

Gi2/9 on 802.1q trunking 1

Port Vlans allowed on trunk

Gi2/9 1-4094

Port Vlans allowed and active in management domain

Gi2/9 1,172

Port Vlans in spanning tree forwarding state and not pruned

Gi2/9 1,172


g8wcng8wcn Mon, 01/26/2009 - 02:18

Hi All

Can anyone answer the following questions

Can the 4900 Merge traffic from 4 10ge VLAN ports before throwing away one of the VLAN tags, then merge it with 4 10ge none VLAN traffic before piping it out to one or more 10ge interfaces?



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