I previously posted on how to "Create a VLAN Trunk between Cisco CatOS and a Foundry BigIron". During the same project I also had to create a trunk between Cisco IOS and a Foundry BigIron. Anyone who has used both CatOS and IOS know that there is a significant difference in configuring them to do the same thing. I felt it made sense to keep these posts separate, to keep people from getting confused.

In this specific situation I had to find a way to trunk multiple vlans between a Cisco 3500 IOS and a Foundry BigIron switch.

Unfortunately Cisco and Foundry disagree on the definition of a "trunk". Awhile ago I had to find a way to trunk multiple vlans between a Cisco 5000 CatOS and a Foundry BigIron switch. I made a quick call to a Foundry Systems Engineer to find out what was needed to make this happen.

Due to the difference between the interfaces of Cisco's CatOS and IOS, one needs to perform different commands to create a trunk.