ISL TRUNKING/BANDWIDTH UTILIZATION

[Kekoa]

Can someone explain how ISL trunking utilizes bandwidth? For example, if I'm only trunking 2 vlans, will ISL trunking give out equal amounts of bandwidth to each vlan? Or does it operate as a first come first serve type basis? Can I allocate, let say, 75% of the trunk for VLAN 1 and the other 25% of the trunk for VLAN 2?

Thanks for your help.....

Kekoa

(any documentation would be a great help too!)

 

[brycec]

ISL doesn't concern itself with bandwidth as it's purely the encapsulation type you're using for the trunk.
If you want to allocate bandwidths to trunk links, then I would suggest you look into using rate-limit or police commands. In this way you can specify limitations to VLANs.

It might be an idea to setup sub-interfaces on which you can apply this feature though.

You could do worse than start at the following link for information regarding rate limiting.

http://www.cisco.com/en/US/products/sw/iosswrel/ps1820/products_feature_guide09186a00800f4890.html