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Cisco Bug: CSCuo62498 - MF: C4948 %C4K_HWPORTMAN-4-BLOCKEDTXQUEUE: Blocked transmit queue

Last Modified

Nov 20, 2020

Products (1)

  • Cisco Catalyst 4000 Series Switches

Known Affected Releases


Description (partial)

C4948TxQ will block transmit after BusyBit counters keep increasing for a while.

Apr 11 00:26:21 8865: 008861: Apr 11 00:26:19.749 BST: %C4K_HWPORTMAN-3-TXQUEDRAINFAILURE: Failed to drain transmit queues on Switch Phyport Te1/5 using slot pool 65535
0016 ar20.englw  Apr 11 00:29:51 8866: 008862: Apr 11 00:29:49.996 BST: %C4K_HWPORTMAN-4-BLOCKEDTXQUEUE: Blocked transmit queue HwTxQId7 on Switch Phyport Te1/5, count=1

This message can appear when the port in question is receiving pause
frames from the peer (see "show int gi x/y flow" on this port and the peer port).
show platform software int gi x/y all | inc Busy
shows an increasing BusyBitActivityCount as in
  BusyBitActivityCount      : 431

Related Community Discussions

<key>CSCuo62498</key> - MF C4948 percentC4K_HWPORTMAN-4-BLOCKEDTXQUEUE: Blocked transmit queue
Hello, we have been getting this &quot;000326: Nov 12 10:07:48.461: %C4K_HWPORTMAN-4-BLOCKEDTXQUEUE: Blocked transmit queue HwTxQId3 on Switch Phyport Gi1/1, count=10936&quot; for couple of days now, switch reload did not resolve the issue. We are still getting the same log on the same port. Anyone that has an opinion?
Latest activity: Nov 14, 2019
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