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7750 trunk to Catalyst 2960

 
rambo888888
Occasional Advisor

7750 trunk to Catalyst 2960

anyone have any idea to configure trunk between 7750 to cat 2960?



is it i only need to configure port trunk on 7750  and trunk on cat 2960?



what about hybrid port?



4 REPLIES
Fred_Mancen_1
Super Advisor

Re: 7750 trunk to Catalyst 2960

Yes, both vendors use the 802.1Q as the standard protocol in trunk mode. Some years ago Cisco also used the ISL (a proprietary protocol), but nowadays it uses the 802.1Q. All you need to do is ensure that these parameters are correctly configured on both sides (note that I am mentioning the 3Com parameters with equivalent Cisco command beside):



port link-type trunk => switchport mode trunk



port trunk permit vlan <permitted_vlan_id_list> => switchport trunk allowed vlan <permitted_vlan_id_list>



port trunk pvid vlan <vlan_id> => switchport trunk native vlan <vlan_id>



3com uses 802.1Q as the standard => switchport trunk encapsulation dot1q



The hybrid port is cool, but the trunk is more recommended in this case, because it's easier to maintain and change the settings when needed than hybrid mode. The hybrid port permit that you assign more than one VLAN ID untagged on the connection, the trunk mode permit that you use just one VLAN ID untagged (PVID). The hybrid port is applicable when connecting devices that don't supports 802.1Q.



HTH



 



rambo888888
Occasional Advisor

Re: 7750 trunk to Catalyst 2960

i already configured on cisco:



switchport mode trunk



switchport trunk allowed VLAN 205,209,50,51



 



on 3Com:



interface GigabitEthernet4/0/14


 port link-type trunk


 port trunk permit vlan all



suddenly i error log in CIsco switch:BPDU error



then the suddenly the interface VLAN 205 in 3com suddenly down.



is it i must put this command?



port trunk pvid vlan <vlan_id> => switchport trunk native vlan <vlan_id>



 



 



Fred_Mancen_1
Super Advisor

Re: 7750 trunk to Catalyst 2960

Yes, you have to specify what is the native VLAN (PVID) of the trunk. This is the VLAN in which the BPDU traffic will pass.



It must be the same VLAN on both sides.



Regards



rambo888888
Occasional Advisor

Re: 7750 trunk to Catalyst 2960

i follow your steps and both switches can work together now. but, the old vlan still cannot work with this configuration. i dont know how the previous engineer configure the old VLAN