3COM Trunking... help 1

[mesuti]

I have a trouble with these 3COM 3300XM super stack 3

|3COM A |----trunk-----| 3COM B |----trunk----|cisco 6500|


I want to be able that a port of a VLAN 2 in cisco 6500 to be see the vlan 2 of 3COM A and the opposite, but 3COM B is not forwarding the vlan information, 3COM A and Cisco 6500 can see the 3COM B but not the each other,
can someone please help me with the curren problem

 

[TimRegester]

Two points

A trunk on a 3com switch refers to a group of connections aggregated in the same way as fast etherchannel or Link Aggregation Protocol. On a cisco switch a trunk is an uplink connection. The definition is a point of argument but is critical. You can trunk between 3Com switches according to the 3Com definition but not to a Cisco catalyst as their is no trunking mechanism in common. The 3com to cisco link must not be part of a trunk on the 3com side but should be on the cisco side, both should be 802.1q tagged.

The 3com-3com link should also be tagged.

The VLAN ids of the two VLAN 2's (i.e. one on Cisco and one on 3300s need to be the same. The connection between the two switches also needs to be 802.1q compliant. This does work, I have done it myself, but unless you make the cisco to 3300 B switch and the 3300 B - A switch connections 802.1q then this will not work. The VLAN id is the VID on the 3300.

It should all work well if all these rules are followed.

 

[mesuti]

first of all thank you for your reply, I solved the problem, all I needed to do was to assign a trunk port (example 3COM B to 3COM A) in 3COM B to UNIT 1 Trunk and assign the second trunk port (3COM B to Cisco 6500) on UNIT 2 Trunk

these commands I needed to enter
feature > trunk > addPort > Unit 1 > 1
feature > trunk > addPort > Unit 2 > 2

 

[abdulpmajeed]

Hai,

I am also facing the same problem in the trunk configuration between cisco and 3com switches. I have posted a thread in this forum(Trunk configuration between cisco and 3com switches). Kindly help me in sortingout this.

thanz

 

[mesuti]

I experienced problems between 3COM and Cisco, but I solved all problems, if you have a problem like the one that I wrote before a month, here' the solution :

my topology was :

3COM 1-----3COM 2----cisco 6500

the problem was that 3COM 2 didn't do trunking between 3COM 1 and cisco 6500, all I needed to do in 3COM 2 was to assign one port in UNIT 1 Trunk 1 (ex: the trunk between 3COM 2 and 3COM 1) and the other port to assing as UNIT 1 Trunk 2 (trunk between cisco and 3com 2)
so this did trunking between 3com 1 and cisco, if you aren't clear regarding this example , just write again.