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Ethernet Switches & Routers

Frequent Contributor
Posts: 90
Registered: ‎12-26-2010

VLAN trunking

I am much familiar with multiport trunking ( to me it was trunking) and recently i learned that there is a VLAN trunking too. Could some one explian in simple what is VLAN trunking and if possible with an analogy. if this is not a Brocare terminology what is this called here?

Frequent Contributor
Posts: 117
Registered: ‎07-26-2010

Re: VLAN trunking


Yes trunk is a multiple used expression.

With VLAN trunking is meant that multiple 802.1Q VLANs are transmitted tagged from one switch to another switch.

tagged means that the ethernet packets include the 802.1Q VLAN tag field for identifying and transporting the VLAN ID between switches.

e.g. Cisco

switchport mode trunk

switchport encapsulation dot1q

Trunking is also often used for combining multiple ethernet ports together to one logical port for increasing bandwidth and having load balancing and redundancy.

Cisco names this port-channel others say LAG (Link Aggregation Group)

This could be run static (without any protocol, Cisco = mode on) or dynamic with LACP protocol (Cisco = mode active).

Brocade has static LAGs called trunk in the config and have dynamic LAGs with LACP called "link-aggregate" in the config of FastIron or LAG on Netiron.

Hope this helps


Frequent Contributor
Posts: 90
Registered: ‎12-26-2010

Re: VLAN trunking

Karl,  you pretty much covered what i was looking for.

I am stll open to hear other versions of the story

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