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Cisco Bug: CSCvu22796 - ENH: CRUZ does not load balance non-IP traffic and sends it all to RX[00]

Last Modified

Oct 06, 2020

Products (1)

  • Cisco ASA 5500-X Series Firewalls

Known Affected Releases

9.12(1)

Description (partial)

Symptom:
High CPU will be observed.
Network Degradation.

No buffer drops seen on Internal-Data interface.
Most traffic going to RX[00] as in the following example:

Interface Internal-Data0/1 "", is up, line protocol is up
Hardware is , BW 40000 Mbps, DLY 10 usec
(Full-duplex), (40000 Mbps)
Input flow control is unsupported, output flow control is unsupported
MAC address , MTU not set
IP address unassigned
23202169 packets input, 1768362610 bytes, 24451559 no buffer
Received 0 broadcasts, 0 runts, 0 giants
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 pause input, 0 resume input
0 L2 decode drops, 0 demux drops
10022291 packets output, 721604920 bytes, 0 underruns
0 pause output, 0 resume output
0 output errors, 0 collisions, 0 interface resets
0 late collisions, 0 deferred
0 output decode drops
0 backplane ingress drops, 0 backplane egress drops
0 input reset drops, 0 output reset drops
Queue Stats:
RX[00]: 23202169 packets, 1577747698 bytes, 0 overrun
Blocks free curr/low: 512/101
RX[01]: 0 packets, 0 bytes, 0 overrun
Blocks free curr/low: 512/512
RX[02]: 0 packets, 0 bytes, 0 overrun
Blocks free curr/low: 512/512
RX[03]: 0 packets, 0 bytes, 0 overrun
Blocks free curr/low: 512/512
RX[04]: 0 packets, 0 bytes, 0 overrun
Blocks free curr/low: 512/512
RX[05]: 0 packets, 0 bytes, 0 overrun
Blocks free curr/low: 512/512
RX[06]: 0 packets, 0 bytes, 0 overrun
Blocks free curr/low: 512/512

Conditions:
4100/9300 appliances
High volumes of non-IP traffic reaching the box
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