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New Member

Cat4500 - 802.1Q tunneling Support

The link below only mentions 802.1Q but I believe it is a typo.

"Be aware that 802.1Q requires the Cisco Catalyst 4948, the Cisco Catalyst 4948-10GE, or the Catalyst 4500 series switch supervisor engines II-Plus-10GE V, or V-10GE; Layer 2 protocol tunneling is supported on all supervisor engines."

I'm pretty sure its not supported on the SupIV and only on certain Sup engines. Can someone confirm? Thanks a lot!


Re: Cat4500 - 802.1Q tunneling Support

Looks like a type to me. Here's from one of my 4500's

XXX4506-1#sh ver

Cisco IOS Software, Catalyst 4500 L3 Switch Software (cat4500-ENTSERVICESK9-M), Version 12.2(46)SG, RELEASE SOFTWARE (fc1)

Technical Support:

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

Compiled Fri 27-Jun-08 16:24 by prod_rel_team

Image text-base: 0x10000000, data-base: 0x11E3C0D8

ROM: 12.1(20r)EW1

Dagobah Revision 95, Swamp Revision 29

XXX4506-1 uptime is 5 weeks, 2 days, 3 hours, 52 minutes

System returned to ROM by reload

System restarted at 04:44:38 CDT Sun Sep 21 2008

System image file is "bootflash:cat4500-entservicesk9-mz.122-46.SG.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

to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:

If you require further assistance please contact us by sending email to

cisco WS-C4506 (MPC8245) processor (revision 7) with 524288K bytes of memory.

Processor board ID FOX090102JA

MPC8245 CPU at 333Mhz, Supervisor IV

Last reset from Reload

17 Virtual Ethernet interfaces

20 Gigabit Ethernet interfaces

403K bytes of non-volatile configuration memory.

Configuration register is 0x2102

XXX4506-1#sh int trunk

Port Mode Encapsulation Status Native vlan

Gi1/1 on 802.1q trunking X

Gi1/2 on 802.1q trunking X

Gi2/1 on 802.1q trunking X

Gi2/2 on 802.1q trunking X

Gi2/3 on 802.1q trunking X

Gi2/4 on 802.1q trunking X

Gi2/5 on 802.1q trunking X

New Member

Re: Cat4500 - 802.1Q tunneling Support

I have a same IOS on Cisco4500 (cat4500-ENTSERVICESK9-M), Version 12.2(46)SG, RELEASE SOFTWARE (fc1)

MPC8245 CPU at 333Mhz, Supervisor 6 E

I am trying to configure:

switchport trunk encap

but looks lits its not supported on the device or the IOS.

Is thier a correct IOS which support the trunk encaplusation.

New Member

Re: Cat4500 - 802.1Q tunneling Support

most likely the port only supports 802.1Q. This is common for Cat4000 platform. The command only works on ports that support both 802.1Q and ISL. You can check with, example, show interface G1/1 capab

So, in your case, if you want to set it to trunk mode without negotiation, use command switch mode trunk

RobertSwitch#sh int g1/1 cap


Model: WS-X4515-Gbic

Type: No Gbic

Speed: 1000

Duplex: full

Trunk encap. type: 802.1Q,ISL

Trunk mode: on,off,desirable,nonegotiate

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