Question

What is GVRP?

Asked by: Dragon0x40

What is GVRP and is it used often?

Ran across it in some documentation and had never heard of it before.

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Asked On
2009-10-03 at 20:28:19ID24783184
Tags

Cisco

,

Switch

Topic

Network Switches & Hubs

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3
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500
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Answers

 

by: lfredaPosted on 2009-10-03 at 20:37:40ID: 25488050

 

by: Dragon0x40Posted on 2009-10-03 at 22:00:03ID: 25488191

thanks ifreda
This paragraph from your link seems to sum it up pretty quickly.

To complete the picture, an endnode with GVRP-aware NIC connects to a switch. This GVRP-aware NIC, configured for a specific VLAN or VLANs, begins advertising its configured VLAN(s) to the directly-connected switch. The receiving port on the switch becomes a member of the VLAN(s) it learned -and then advertises the VLAN(s) out all other ports.

Do you know if GVRP is still being supported by Cisco and if most NICs support it?

Anyone recommending using it?

 

by: stefanxPosted on 2009-10-03 at 22:31:39ID: 25488248

Apparently GVRP is required to be implemented for the VLAN to be considered 801.2Q compliant. If that's true, then I guess yes, it is likely to be supported by any device that claims to be 802.1Q compliant. Since CISCO certainly claims 802.1Q compliance, it should work with CISCO. I say this, but I've never experienced this first hand - I just see this on a post at http://www.tomshardware.co.uk/forum/page-19887_17_0.html

In terms of whether the NIC supports this, that depends. For Windows, at least 2003 Server, you configure the VLAN ID on the advanced settings of your NIC. It is only available if the NIC driver supports it. On Linux, any NIC can be part of a VLAN by using vconfig instead of ifconfig to assign an IP to the NIC. One can also vconfig multiple tagged VLAN ID's onto a NIC (I don't know how this is done under Windows, maybe the NIC driver has an add button for multiple VLAN ID's)

Personally, I would shy away from GVRP other than maybe between switches.  You generally set up different VLANs to enforce a security policy and I would feel really uncomfortable if end-devices had the ability to make themselves part of a VLAN or not. One cannot trust end users to decide what VLAN they want to be part of ?

 

by: Dragon0x40Posted on 2009-10-03 at 22:57:48ID: 25488285

thanks stefanx

I thought you had mistyped 802.1q but then I searched for 801.2q and you hadn't!

801.2q? Have to investigate that one.

 

by: stefanxPosted on 2009-10-03 at 23:02:33ID: 25488291

Yeah sorry, right at the beginning I mistyped 802.1Q as 801.2Q. Sorry ;)

 

by: donjohnstonPosted on 2009-10-04 at 04:38:39ID: 25488882

GVRP is not supported on Cisco IOS switches. It is (was) supported on CatOS switches though.


 

by: Dragon0x40Posted on 2009-10-04 at 05:30:45ID: 25489008

thanks donjohnson

I read about in the Cat 4000 family software document.  Any idea why Cisco gave up on it?

 

by: donjohnstonPosted on 2009-10-04 at 06:14:41ID: 25489097

It's just not used that much. The primary purpose of GVRP is to remove VLANs from trunks. Most don't like leaving that to a protocol and would rather do it manually.

20120131-EE-VQP-002

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