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 Post subject: Intermittent connection issues
PostPosted: Wed May 28, 2014 12:48 am 
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Joined: Wed Jun 15, 2011 3:52 am
Posts: 6
I'm having connectivity issues pinging from one IOU switch to another.

Sw1 ------- Sw2
| . . . . . . |
| . . . . . . |
| . . . . . . |
Sw3 --------Sw4


Sw1# ping 10.0.0.4 (sw4)
...!..!!!!..!.....!.!..
Sw2# ping 10.0.0.1 (sw1)
....!..........!!!.....

Does anyone have a solution for this? I've tried different Spanning-tree modes rapid, pvst+, and MST

Using i86bi-linux-l2-adventerprisek9-15.1a

Thanks




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 Post subject: IOU IOL AMDP2_FE-6-EXCESSCOLL
PostPosted: Wed May 28, 2014 8:33 am 
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Joined: Sun Feb 27, 2011 1:53 am
Posts: 32
You have edit the "/etc/sysctl.conf" and add the following line to resolve the "%AMDP2_FE-6-EXCESSCOLL" issue:

Code:
net.unix.max_dgram_qlen = 30000


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 Post subject: Re: Intermittent connection issues
PostPosted: Wed May 28, 2014 1:47 pm 
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Joined: Fri Mar 07, 2014 2:54 pm
Posts: 20
There is a known issue with full mesh topologies and the spanning tree protocol with the L2 IOU images.

So I've done some additional testing on this issue, where I took GNS3 and iouyap out of the equation. I created a simple netmap file and setup a full mesh of 4 devices. I then ran 4 instances of a layer 2 IOU image and setup full mesh trunking. It all worked flawlessly. No issues encountered. I also did not receive any of the EXCESS-COL messages either... (500K pings between each switch does send your cpu util quite high 8p - and yes all 2M pings sent/received at 100% - no loss )

Conclusion, there must be some delay introduced with the iouyap wrapper which the L2 images do not handle well.

Hope this helps.
Richard

UPDATE: This issue looks to be resolved. At least in 1.0a6.dev3. I'm sure soon to be released as Alpha 6.




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