NX-OS ingress traffic disappeared, trying to find out where it went
Recently we experienced a large ingress spike, on the order of 7Gb/s at our borders. Tracing it back through our network, we see it passing our NX-OS 7k's, into a 5548 pair, and finally stopping at one of the fiber uplinks of a 2248. Basically, we are able to see the traffic flowing toward the access layer, but once it gets there, no access layer ports show any ingress spikes.
I've looked over all of our traffic graphs during this time period, and I'm stumped. My only thought left would be a possible buffer overflow occurred, and packets ended up getting dropped. I'm still new to the NX-OS game, so I was hoping someone may know how to check the queuing output for possible buffer issues, queuing drops, and so on.
I found 'show queuing interface', but I'm having trouble deciphering the output. I'm concerned about the xoff counters, and was wondering if the output below my indicate that some flow-control was being used during this ingress spike period. Here is one such output on the last port we are able to see the traffic taking:
RX Queuing qos-group 0 q-size: 470080, HW MTU: 1500 (1500 configured) drop-type: drop, xon: 0, xoff: 470080 Statistics: Pkts received over the port : 3946459590 Ucast pkts sent to the cross-bar : 2961741530 Mcast pkts sent to the cross-bar : 984718150 Ucast pkts received from the cross-bar : 1626945682 Pkts sent to the port : 1798052191 Pkts discarded on ingress : 0 Per-priority-pause status : Rx (Inactive), Tx (Inactive)
Total Multicast crossbar statistics: Mcast pkts received from the cross-bar : 171106425
FEX interface info: FEX Drop Class Buffer Size: 316160
Total FEX interface statistics: FEX Uplink Interface Rx Drops: 0
As far as I can tell, we have not modified any class-maps or policy-maps on this switch, and I would assume the same about our 2248 FEX switches.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.