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cisco 3com LACP trunk

 
scaniafreak
Occasional Contributor

cisco 3com LACP trunk

Dear 3com users,



At my company we have all cisco switches. Recently a new productionsystem is installed which involved a 3com 2916-SFP Plus switch. The 3com and Our cisco 3750 has to be connected via a LACP channel which also is a 802.1q trunk.



the config is as following:



I have 3 vlans: vlan1 (native), vlan4 (management), vlan10(other). those vlans are also created on our cisco.


port 15/16 on the 3com is bundled as a LACP channel and 802.1q trunk which only allows vlan1 and vlan10.


3com port 8 is connected to cisco port 17. Both ports are in vlan4 for managment purposes only.



port 8 is untagged in vlan1 and tagged in vlan4


port 15/16 is untagged in vlan 1 and tagged in vlan 10


all other ports are untagged in vlan 10



the LACP channel is created succesfully. Only, on the cisco i get messages of a native vlan mismatch for vlan 4 and vlan 1. Also Spanning tree shuts down port 17 on the cisco (vlan 4).



as i'm a cisco guy, i know that the cisco switch is configured correctly. How must i configure my vlans on the 3com?



Thanks in advance.



 



4 REPLIES
scaniafreak
Occasional Contributor

Re: cisco 3com LACP trunk

Dear 3com users,



At my company we have all cisco switches. Recently a new productionsystem is installed which involved a 3com 2916-SFP Plus switch. The 3com and Our cisco 3750 has to be connected via a LACP channel which also is a 802.1q trunk.



the config is as following:



I have 3 vlans: vlan1 (native), vlan4 (management), vlan10(other). those vlans are also created on our cisco.


port 15/16 on the 3com is bundled as a LACP channel and 802.1q trunk which only allows vlan1 and vlan10.


3com port 8 is connected to cisco port 17. Both ports are in vlan4 for managment purposes only.



port 8 is untagged in vlan1 and tagged in vlan4


port 15/16 is untagged in vlan 1 and tagged in vlan 10


all other ports are untagged in vlan 10



the LACP channel is created succesfully. Only, on the cisco i get messages of a native vlan mismatch for vlan 4 and vlan 1. Also Spanning tree shuts down port 17 on the cisco (vlan 4).



as i'm a cisco guy, i know that the cisco switch is configured correctly. How must i configure my vlans on the 3com?



Thanks in advance.



 



Fred_Mancen_1
Super Advisor

Re: cisco 3com LACP trunk

Hi. As your skills are stronger in Cisco, follows the commands that are equivalent to Cisco in 3Com OS:



switchport mode trunk => 3com OS: port link-type trunk



switchport trunk allowed vlan => 3com OS: port trunk permit vlan



switchport trunk native vlan => 3com OS: port trunk pvid vlan



Regarding the LACP group (LAG = Link Aggregation Group), in 3com you need to create it as the following way:



link-aggregation group <lag_id> mode static



link-aggregation group <lag_id> description <description>



In the interfaces you want to group:



port link-aggregation group <lag_id>



To check the status of the LAG:



display link-aggregation verbose <lag_id>



HTH.



scaniafreak
Occasional Contributor

Re: cisco 3com LACP trunk

hi,



i've tried via the CLI, but it's really compact.


the only options i have in the CLI are initialize, ipsetup, logout, password, ping, reboot, summary and upgrade.


I don't know if it's the type of switch why i have a simple CLI.



Mostly i have configured the switch via de web interface, but it's a bit confusing regarding the vlans etc.



This message was edited by roel.beelen on 3-15-10 @ 10:15 AM
scaniafreak
Occasional Contributor

Re: cisco 3com LACP trunk

hi everyone,



the problem is solved. As only traffic from vlan 10 has to traverse the link, it wasn't neccesary to establish a 802.1q trunk.



I've put all ports, exept port 8, in vlan 10. On the Cisco switch i've put the LACP channel also in vlan 10.



thanks for your replies.