Xmit-Err Error on Catalyst 4006 please advice ASAP

avilt · ‎10-02-2010

I have a new 2901 router whose which is connected to Catalyst 4006. Speed/duplex are set to auto on both the ends and it's negotiated to 100mbps/full on both the ends. However I see some packet drops and on the switch side I can see Xmit-Err Error as shown below. Kindly advice.

PCALJP00SW01> (enable) show port 3/31
Port Name Status Vlan Level Duplex Speed Type
----- ------------------ ---------- ---------- ------ ------ ----- ------------
3/31 connected 20 normal a-full a-100 10/100BaseTX

Port AuxiliaryVlan AuxVlan-Status     InlinePowered     PowerAllocated
                                   Admin Oper   Detected mWatt mA @51V
----- ------------- -------------- ----- ------ -------- ----- --------
3/31 none          none           -     -      -        -     -

Port Security Violation Shutdown-Time Age-Time Max-Addr Trap IfIndex
----- -------- --------- ------------- -------- -------- -------- -------
3/31 disabled shutdown 0 0 1 enabled 105

Port Num-Addr Secure-Src-Addr Age-Left Last-Src-Addr Shutdown/Time-Left
----- -------- ----------------- -------- ----------------- ------------------
3/31 0 - - - - -

Port Status     Channel              Admin Ch
                 Mode                 Group Id
----- ---------- -------------------- ----- -----
3/31 connected auto silent            119     0

Port Align-Err FCS-Err Xmit-Err Rcv-Err UnderSize
----- ---------- ---------- ---------- ---------- ---------
3/31 - 0 23700 0 0

Port Single-Col Multi-Coll Late-Coll Excess-Col Carri-Sen Runts Giants
----- ---------- ---------- ---------- ---------- --------- --------- ---------
3/31 0 0 0 0 1 0 0

Frederic Vanderbecq · ‎10-18-2010

Hello,

an Xmit-err indicates a specific frame could not be forwarded because of an internal MAC sublayer transmit error. For instance, this could be an indication the internal transmit buffer is full.

Could you capture the output of "show counters" for that particular port two or three times in a row at the time the xmit-err is incrementing ?

If you see that "txQueueNotAvailable" counter is increasing at the same rateas that of Xmit-Error, it most probably means the port queues are overrun by traffic leading to packet drops and xmit-err.

Frederic

avilt · ‎10-18-2010

Thank You. I will be connecting this router again with new LAN cables to the switch this week end and let you know the status.