3Com/Cisco 802.1Q trunk 1

[jdavis1]

Hi all....

I'm a Cisco guy trying to work with a 3Com switch 4400. First off, let me define what I mean by the term "trunk". Cisco refers to trunks as lines that carry multiple VLANs. 3Com seems to refer to trunks as port aggregation groups. I am using the Cisco definition of a single ethernet port carrying multiple 802.1Q Vlans.

With that out of the way, here is what I am trying to do. Connect a Cisco router port configured with 2 802.1Q VLANs to a 3Com switch 4400 (Sw version 3.02). If I were to connect a Cisco switch to the router port I would need to configure the switch ethernet interface in trunk mode. What is the 3Com equivalent? Does it trunk multiple Vlans on an ethernet port by default?

To make this even more fun I am doing this in a production environment from about 1000 miles away. I can't do any experimentation and I need to get it right the first time.

Thanks for any help.

 

[IRudebwoy]

3com calls that VLAN tagging. You can define ports as tagged or untagged members of a VLAN. Untagged makes the port a member of only one VLAN. Tagged allows multiple VLANs on a single port. You would have to define all VLANs that would cross the link and make that port a tagged member of each VLAN.

I don't mean to rain on your parade but I think you might have to update the firmware of the switch before you get the VLAN options. See this thread.

Have Fun!

 

[jdavis1]

Thanks Rudy. I had the impression that the firmware was a bit out of date.

Call me a coward, but ultimately, I think I am going to have my colleague at the site do some rearranging of the 3Com, Bay, and Cisco switches at the site and connect his single Cisco switch to the router.