03-12-2015 09:16 AM - edited 03-07-2019 11:04 PM
We have a netapp storage on our Nexus and we are seeing alot of pks discarded on ingreess. I know that the Nexus does ingress queing so this seems to point to congestion on an egress port. How can I figure out what port is causing the problem or has the congestion?
I looked on Ciscos website but I can't find a good troubleshooting docutment.
qos-group 4
q-size: 29760, HW MTU: 9216 (9216 configured)
drop-type: drop, xon: 0, xoff: 29760
Statistics:
Pkts received over the port : 5589330309
Ucast pkts sent to the cross-bar : 5504968963
Mcast pkts sent to the cross-bar : 86720
Ucast pkts received from the cross-bar : 0
Pkts sent to the port : 162325
Pkts discarded on ingress : 72274627
Per-priority-pause status : Rx (Inactive), Tx (Inactive)
Kindly help how to find which egress port is congested due to which ingress discards are increasing (I think this is a backpressure suitation)).
NXOS Version is 5.2(1)
03-13-2015 01:25 PM
U have jumbo frames configured? it is not bad but I just want that u know and want that.
Did you check the interface counters and see any problem..maybe do a clear counter interface before
- sh inter count erro
Is there somewhere a bottleneck, because u are right. ingress drops means there is a congestion on one of the egress..
is it a N7K?
U can check with an elam trigger where your packets are going, if u have redundacy for example..
just google for "N7K elam" u will find that e.g. which help me already to find the exact flow..use it for the module u have in place.
http://www.cisco.com/c/en/us/support/docs/switches/nexus-7000-series-switches/116647-technote-product-00.html
03-17-2015 06:03 AM
Thanks for your reply..
We don't have any N7K but we have Nexus 5548 UP model. So i checked ELAM doesn't support on N5K.
Kindly tell any other procedure to get to know which egress port is congested due to which ingress discards are increasing..?
Kindly help here...
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