Monitoring queue operation
Use the show interface command to display the number of packets and bytes queued for transmission. For example:
switch# show interface 1/1/5 queues
Interface 1/1/5 is up
Admin state is up
Tx Bytes Tx Packets Tx Errors Tx Byte Depth
Q0 157113373520 1890863919 0 1362
Q1 233312143017 2808451320 18 65550
Q2 156814056423 1887257650 0 1392
Q3 157441358980 1894815504 0 1374
Q4 157700809294 1897941370 0 1362
Q5 157872849381 1900014146 0 1392
Q6 183486049854 2208268429 0 4398
Q7 231607534141 2787913734 0 65544
- Tx Bytes: Total bytes transmitted. The byte count may include packet headers and internal metadata that are removed before the packet is transmitted. Packet headers added when the packet is transmitted may not be included.
- Tx Packets: Total packets transmitted.
- Tx Errors: Shows the amount of traffic dropped on an egress interface before it was sent. When traffic cannot be forwarded out an egress interface, it backs up on ingress. The more servicing assigned to a queue by a schedule profile, the less likely traffic destined for that queue will back up and be dropped. Tx Errors shows the sum of packets that were dropped across all line modules (due to insufficient capacity) by the ingress Virtual Output Queues (VOQs) destined for the egress port. As the counts are read separately from each line module, the sum is not an instantaneous snapshot.
- Tx Byte Depth: Largest byte depth (or high watermark) found on any ingress line module Virtual Output Queue (VOQ) destined for the egress port.