Solved

Switch:  Combined Ports

Posted on 2007-04-01
2
240 Views
Last Modified: 2010-04-12
Hello Experts,

I have a question in regards to linking two switches together.  Lets say I have two Catalyst switches, both are 3750's and I connected fa0/10, fa0/11and fa0/12 from SW1 to SW1 respectively.  Let say that each port is running at 100Mb.  Does this mean that the total link between the switches is 300 Mb?  If not, how can this be achieve via CAT5?  What commands do I need to read up?

As always, thank you in advance for your time on this matter.
0
Comment
Question by:coperator
2 Comments
 
LVL 5

Accepted Solution

by:
mdrichards earned 250 total points
ID: 18834212
Yep you certainly can, although with 3750's you'd wanna use the builtin backplane as it is much faster.

If you want to group standard ethernet ports together you want to set up an "EtherChannel"

You basically group fa0/10, 0/11 and 0/12 into a "channel-group" making them a virtual 300 Mb channel.

Check out the links below

http://en.wikipedia.org/wiki/EtherChannel

http://www.cisco.com/en/US/tech/tk389/tk213/technologies_configuration_example09186a0080094647.shtml
0
 
LVL 50

Assisted Solution

by:Don Johnston
Don Johnston earned 250 total points
ID: 18835556
>Does this mean that the total link between the switches is 300 Mb?

No. Spanning tree will block all but one link resulting in a single, operational 100mb link.

>If not, how can this be achieve via CAT5?

The closest you can come to doing that is etherchannel. However, Etherchannel groups must be 2, 4 or 8 links. If you try it with 3, the best outcome would be that only 2 of the links would carry traffic.

Even if you use a 4 port etherchannel group, it will still not give you a 400mb "pipe" between the switches. The traffic between two end devices (say A and B) that cross the etherchannel will use one of the 4 fastethernet links. The traffic between C and D may use a different link.

The bottom line is that etherchannel doesn't give you a faster path between two switches. It's really just a way of trying to get around spanning-tree blocking the redundant ports. At the end of the day, if you need more bandwidth, a faster link is the only way to go.
0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
The purpose of Root Bridge 7 45
Why APC patch cords are not recommended wirth 10GBase SFP+ Gbics? 6 71
Cisco Switch Port Security 2 37
ssh setup on Cisco swith 11 45
I see many questions here on Experts Exchange regarding switch port configurations and trunks. This article is meant for beginners in the subject to help to get basic knowledge about Virtual Local Area Network (VLAN (http://en.wikipedia.org/wiki/Vir…
I eventually solved a perplexing problem setting up telnet for a new switch.  I installed a new Cisco WS-03560X-24P switch connected to an existing Cisco 4506 running a WS-X4013-10GE Sup II-Plus. After configuring vlans and trunking,  I could no…
Migrating to Microsoft Office 365 is becoming increasingly popular for organizations both large and small. If you have made the leap to Microsoft’s cloud platform, you know that you will need to create a corporate email signature for your Office 365…
Video by: Mark
This lesson goes over how to construct ordered and unordered lists and how to create hyperlinks.

867 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

Need Help in Real-Time?

Connect with top rated Experts

22 Experts available now in Live!

Get 1:1 Help Now