Hi,
I'm trying to understand the counter Rx-No-Pkt-Buff on module WS-X4548-GB-RJ45. We have a Supervisor Engine IV in this WS-C4506 chassis.
I know this card has 6 portgroups in which members share 1Gbps throughput.
I'm seeing inpunt errors on 2 interfaces which correspond 1:1 with the Rx-No-Pkt-Buff counter. The device connected to these 2 ports is a Cisco 3020 switch in an HP Blade enclosure.
Gi6/43
101 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
Port Rx-No-Pkt-Buff RxPauseFrames TxPauseFrames PauseFramesDrop
Gi6/43 101 0 0 0
Gi6/44
78 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
Port Rx-No-Pkt-Buff RxPauseFrames TxPauseFrames PauseFramesDrop
Gi6/44 78 0 0 0
My guess: the port-group is oversubscribed...
However, only 2 ports in this port-group are in use: 6/43 and 6/44. Both are configured as etherchannel members (which is probably not a good idea because they share the same asic).
According to my graphing (cacti, 1 minute polling) both ports do not generate a total of 1Gbps. CLI output confirms the graphs.
How can I troubleshoot this further? Why is the Rx-No-Pkt-Buff increasing while we don't exceed 1Gbps of bandwidth in this group?
I'm aware this linecard is "probably" not the best to use to connect a Blade enclosure ("designed for gigabit to the desktop"), but I'm just trying to understand why we see this errors...
regards,
Jeroen