On a WS-X6908-10G DCEF2T line card with SUP2T's, I ran into overruns
yesterday on a 4x10G etherchannel that I am at a loss to resolve:
Constantly increasing overrun counter:
6418130558941 packets input, 9277559958229871 bytes, 0 no buffer
Received 668274 broadcasts (0 IP multicasts)
0 runts, 190 giants, 0 throttles
192 input errors, 1 CRC, 0 frame, 51591389 overrun, 0 ignored
Latency into the router rose by 40ms when these overrun's started to appear
This happened at a BW of ~28 Gbps
I've built the etherchannel in this manner:
Index Load Port EC state No of bits
------+------+------------+------------------+-----------
0 0A Te1/1 Active 2
3 81 Te1/2 Active 2
1 60 Te1/3 Active 2
2 14 Te1/4 Active 2
Is it necessary to instead stagger 1/1, 1/3, 1/5, 1/7 to spread the load
across the card ASICs? I didn't think the WS-X6908 was an oversubscribed
card so didn't bother initially.
Peter Kranz
www.UnwiredLtd.com <http://www.unwiredltd.com/>
Desk: 510-868-1614 x100
Mobile: 510-207-0000
[email protected] <mailto:[email protected]>
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