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Webcast-Catalyst9k
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802.1Q Tunnel

Hi,

Say Switch A belongs to customer site.

Switch B belongs to Service Provider

providing 802.1 Tunneling service.

The tunnel config is required on both switches or only on Switch B.

I think on both ports connecting switches , else how will trunk port talk to tunnel port.

Another Question : from Layer 2 Proto Tunneling

The command < l2protocol-tunnel shutdown-threshold pps [cdp | stp vtp]>

causes the tunnel port to shut down in errdisable state if threshold is exceeded. Does that mean it gets shut for all packets or only for l2proto traffic

Plz comment..

Thx

G

2 REPLIES
Purple

Re: 802.1Q Tunnel

It is only required on Switch B. Switch B will tag incoming frames with another 801.q tag on ingress. On egress, it will remove that tag. Therefore, Switch A will perceive that it is simply talking with another Switch over a dot1q trunk.

Hope that helps - pls do rate the post if it does.

Paresh

Re: 802.1Q Tunnel

Hi Gaurav,

IEEE 802.1q tunneling is there to ease the configurations at the service provider end.

Have a look at this URL

http://www.cisco.com/en/US/products/hw/switches/ps700/products_configuration_guide_chapter09186a008007fa06.html#12679

So for your example, Switch A will do normal 802.1q trunking, this traffic will hit the port on Switch B of the service provider, which is configured for 802.1q tunneling.

Hope this helps. Rate the post if you find it usefull.

-VJ

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