Clicky

hey guys

I've got two switches. One is an HP A5120 48port switch. The second one is older and is a 3com 2948 SFP.

I'm trying to set up link aggregation. Now when I log onto both switches, I am able to select 'Link Aggregation' and also 'LACP'. I thought these are both the same thing?

All I want to do is increase throughput from 1gb/s to 2gb/s between switches.

I've attached one screenshot of the menu on the 3com, when you select 'Link Aggregation'. Then the second screenshot is in the same 3com and looking at the 'LACP' section.

Could you guys point me in the right direction as to how to set it up correctly?

Thanks a lot
Yashy

asked 12/13/2011 12:57

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Yashy ♦♦


9 Answers:
Link Aggregation is the concept of combining multiple links to create a single (virtual) link.

LACP (Link Aggregation Control Protocol) is a protocol that negotiates the creation of the virtual link with the other switch.

There are two way to create a Link Aggregation Group:

1) Manually
2) Let LACP negotiate it.

To use an analogy, you can manually set the duplex on a link between two switches, or you can let the switches negotiate it.

Personally, I prefer to use LACP when possible.
link

answered

donjohnston's gravatar image

donjohnston

Well what's strange is I selected ports 4 and 28 with 'Link Aggregation', selected 'Apply' and then before you know it I couldn't access the internet at all!! As soon as I removed the Link Aggregation, I could. Why would that be?

link

answered 2011-12-13 at 09:20:26

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Yashy

Until the group is setup correctly on both sides, there will be no traffic crossing between the two switches.
link

answered 2011-12-13 at 09:41:50

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donjohnston

Aha, thanks for that Don.

So should I create LACP on the first switch.
Then create LACP on the second switch.
Then do Link Aggregation on both switches?

I'm quite new to this, so excuse me for the lame questions:)

 
link

answered 2011-12-13 at 09:52:26

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Yashy

Not exactly. LACP will create the group.
link

answered 2011-12-13 at 10:06:19

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donjohnston

Alright, so then do LACP on switch one and select the two ports. Then do the same on the second switch?
link

answered 2011-12-13 at 10:16:54

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Yashy

Yep.
link

answered 2011-12-13 at 12:16:05

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donjohnston

Okay, I'll let you know how that goes tomorrow morning.
link

answered 2011-12-13 at 12:39:35

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Yashy

Okay, that's been done. I did this manually though. Thanks for your help.
link

answered 2011-12-13 at 13:08:36

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Yashy

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Asked: 12/13/2011 12:57

Seen: 197 times

Last updated: 12/14/2011 06:37