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Author Topic: MLT over wireless connection  (Read 3746 times)

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Offline Johan Witters

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MLT over wireless connection
« on: May 21, 2013, 08:36:25 AM »
Hello guys,

I have a customer with 2 buildings, connected by 2 wireless links. Now that all switches have been replaced with Nortel/Avaya switches, the customer asked me to implement an MLT between the 2 buildings.

Does anyone have any experience with MLT over 2 (Cisco) wireless connections?
Kind regards,

Johan Witters

Network Engineer
BKM NV


Offline Telair

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Re: MLT over wireless connection
« Reply #1 on: May 21, 2013, 12:36:44 PM »
Now that's a bit different...  Humm.  As long the radios were operating in 100% pure bridging mode and the links were nice and solid I don't see why it couldn't work.  I would definitely put VLACP on those links to be able to sense when the link fails and shut it down.  But I think it's going to come down to how the radios bridge traffic as to if this will work.

Sounds interesting.  Let us know how it goes!

Offline Johan Witters

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Re: MLT over wireless connection
« Reply #2 on: May 22, 2013, 03:49:07 AM »
I already tried it but I did not manage to get it working. On 1 of the links VLACP would not come up, if I enable MLT on both switches no traffic would pass. If I disabled MLT on both ends I would end up with a loop.

I'm trying to free up time in my planning to set up a test lab and sort this out further.

Stay tuned....
Kind regards,

Johan Witters

Network Engineer
BKM NV

Offline Telair

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Re: MLT over wireless connection
« Reply #3 on: May 22, 2013, 03:56:29 PM »
Maybe try with LACP instead of MLT?  No need for VLACP then either.

Offline TankII

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Re: MLT over wireless connection
« Reply #4 on: May 22, 2013, 05:28:22 PM »
If they are Cisco 1410's they are designed to bridge together and aggregate throughput.
I haven't done it myself though.

Edit - If you have a VLAN passing through the unit and IP management is on another port, then it might work.  Having extra IP's in the middle seems to muck things up. Noted from an HSDSL link we tried to add another pair of modems to.

TankII

Offline Johan Witters

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Re: MLT over wireless connection
« Reply #5 on: November 11, 2013, 05:40:32 AM »
Hi gues,

I had the opportunity today to get this up and running, finally... I thought to post it as a reference in case someone needs it in the future.

The setup actually is quite easy: configure your switches and wireless bridges/ap's as you should, but disable spanning tree on the wireless bridges/AP's.

I had a stack of 2 ERS2500 switches on one side and a ERS4548GT-PWR on the other side. The wireless links were build with 2x Cisco BR1310 and 2x cisco AP1242's.

I also had to use the VLACP mac address 01:80:c2:00:11:00 to get VLACP running on both links, when using the 00:0F address VLACP wasn't working on the "old" BR1310's.
Kind regards,

Johan Witters

Network Engineer
BKM NV

Offline TankII

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Re: MLT over wireless connection
« Reply #6 on: November 11, 2013, 07:38:50 AM »
Thanks for the success story!

TankII