rcv-err on a cat6500

[grodoni]

on a 6500 we have input error due to rvc-err (internal Rx buffer full ?).

- what rcv-err means exaclty ?

- rcv-err are problably due to

broadcast storm. How to avoid this ?

(for ex. by limiting broadcast

storm, ...)

Here the sh int and sh int counters err

TenGigabitEthernet3/1 is up, line protocol is up (connected)

Hardware is C6k 10000Mb 802.3, address is 0011.933b.45fc (bia 0011.933b.45fc)

MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Full-duplex, 10Gb/s

input flow-control is desired, output flow-control is on

ARP type: ARPA, ARP Timeout 04:00:00

Last input 00:00:34, output 00:00:10, output hang never

Last clearing of "show interface" counters 6d02h

Input queue: 0/2000/17585/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 8580000 bits/sec, 1900 packets/sec

5 minute output rate 2691000 bits/sec, 1471 packets/sec

717910461 packets input, 357404536454 bytes, 0 no buffer

Received 7933047 broadcasts (716416 multicast)

0 runts, 0 giants, 0 throttles

17585 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog, 0 multicast, 0 pause input

0 input packets with dribble condition detected

1474892779 packets output, 1745705861196 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier, 0 PAUSE output

0 output buffer failures, 0 output buffers swapped out

switch>sh int ten 3/1 counters errors

Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize OutDiscards

Te3/1 0 0 0 17595 0 0

Port Single-Col Multi-Col Late-Col Excess-Col Carri-Sen Runts Giant

s

Te3/1 0 0 0 0 0 0

0

Port SQETest-Err Deferred-Tx IntMacTx-Err IntMacRx-Err Symbol-Err

Te3/1 0 0 0 0 0

switch>sh int gig 4/10 counters errors

Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize OutDiscards

Gi4/10 0 0 0 17597 0 0

Port Single-Col Multi-Col Late-Col Excess-Col Carri-Sen Runts Giant

s

Gi4/10 0 0 0 0 0 0

0

Port SQETest-Err Deferred-Tx IntMacTx-Err IntMacRx-Err Symbol-Err

Gi4/10 0 0 0 0 0

[thomas.chen]

Rcv Error - This is an indication of excessive output rates of traffic. This is also an indication of the receive buffer being full. This counter should be zero unless there is excessive traffic through the switch. In some switches, the Out-Lost counter has a direct correlation to the Rcv-Err. This could be a sign that the segment is running at an inferior speed and/or duplex, or there is too much traffic going through the port. The first step in troubleshooting Out-Lost increments is to verify the link partner is running 100 Mbps, full-duplex without any errors. You can check the following link for more information on troubleshooting :

http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note09186a00800a7af0.shtml

[sayala]

You may also want to check if you are not running into a bug where the rcvr error are not showing up under counter. "show interfaces counters [errors | etherchannel | {module number} | {trunk [module number]}] " lists details about the port in greater detail.

http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note09186a008015bfd6.shtml#

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat6000/12_1e/comref/show1.htm#wp2017656

You may also want to look at the number of drops on your input queue.

Input queue - The number of packets in the input queue. Size/max/drops = the current number of frames in the queue / the max number of frames the queue can hold before it must start dropping frames / the actual number of frames dropped because the max queue size was exceeded. Flushes is used to count Selective Packet Discard (SPD) drops on the the Catalyst 6000 Series running Cisco IOS. (The flushes counter may be used but never increments on the Catalyst 4000 Series running Cisco IOS.) SPD is a mechanism that quickly drops low priority packets when the CPU is overloaded in order to save some processing capacity for high priority packets.