Posted on 2013-12-21
Medium Priority
Last Modified: 2013-12-23

Is that correct that a L2 Port-Channel (Cisco 6509-E)  with dot1q ports is the same thing as trunked single port but simply has "more" ports?  So my main advantage would be the extra bandwidth or load balancing?  


Question by:rotarypwr
LVL 31

Accepted Solution

Gareth Gudger earned 668 total points
ID: 39734345
Trunk ports allow VLANs communication. Port Channel combine multiple physical ports to create one big port for load balancing, resiliency and increased bandwidth. For example, you could create a 4GB port channel group that combined 4 x 1GB ports to a mission critical server. A trunk port on the other hand would allow 1 or more VLANs to communicate over a switch port, depending on the permissions of the trunk.

LVL 11

Assisted Solution

Miftaul earned 668 total points
ID: 39734360
A trunk port allows multiple VLANs traffic to pass via a single link. dot1q carries VLAN tags.
Port Channel on the other hand bundles physical links to be virtually tied to create a high speed link.

In production, multiple links between switches are actually trucked and then portchanneled to create a high speed link. Port channel is goos because, if you have multiple redundant links between switches, the Spanning tree on the switch will keep one link up and rest of them stopped. That gives redundancy but not all links are utilized, Port Channel keeps the redundancy and also all the links are utilized.
LVL 47

Assisted Solution

by:Craig Beck
Craig Beck earned 664 total points
ID: 39734890
A PortChannel doesn't specifically have to be trunked.  It can be an access link too.

In Cisco speak we say trunk when we're passing more than one VLAN across a link.
In other vendor speak we call a trunk a link consisting of two or more ports.

So, Cisco PortChannel = 'Other Vendor' Trunk
Cisco Trunk = 'Other Vendor' 802.1q Tagged Port

Author Closing Comment

ID: 39736862
All very helpful feedback with various bits of information.  Thanks All!

Featured Post

Get your problem seen by more experts

Be seen. Boost your question’s priority for more expert views and faster solutions

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

This article is a how to to configure a UCS Ethernet-uplink portchannel via the console. It is easy to do and can be done quite quickly. In certain versions of the UCS manager the portchannel has issues coming up and this is a workaround. I am…
The article explains the protocols and technology which is involved when two computers on different TCP/IP networks communicate with each other. In the diagram, a router is used to segregate two networks. The networks are and 192…
Viewers will learn how to properly install and use Secure Shell (SSH) to work on projects or homework remotely. Download Secure Shell: Follow basic installation instructions: Open Secure Shell and use "Quick Connect" to enter credentials includi…
In this brief tutorial Pawel from AdRem Software explains how you can quickly find out which services are running on your network, or what are the IP addresses of servers responsible for each service. Software used is freeware NetCrunch Tools (https…

624 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question