What does the CPU look like when the traffic is flowing? I'd be curious
to also see the traffic breakdown per interface - not the Port-Channel
itself.
On 03/08/2017 06:49 PM, [email protected] wrote:
Hi Peter,
Do the overrun match with input drops on the interfaces input queue? Maybe
this traffic being punted to CPU?
I had this issue on a Cisco 7600 when using "mpls ldp explicit-null" and
many Gbps of traffic needed to be sent to CPU.
Hope this helps.
Cheers,
JF
Jean-François Dubé
Technicien, Opérations Réseau IP
Ingénierie Exploitation des Réseaux
Vidéotron
"cisco-nsp" <[email protected]> a écrit sur 2017-03-03
12:04:28 :
De : "Peter Kranz" <[email protected]>
A : <[email protected]>,
Date : 2017-03-03 12:09
Objet : [c-nsp] 4x10G Etherchannel overruns
Envoyé par : "cisco-nsp" <[email protected]>
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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