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Cisco Bug: CSCul03432 - 3900e goes Unresponsive and output queue gets full - interfaces wedged

Last Modified

Jul 28, 2020

Products (89)

  • Cisco IOS
  • Cisco 888W Integrated Services Router
  • Cisco 886VAG 3G Integrated Services Router
  • Cisco 1905 Serial Integrated Services Router
  • Cisco C892FSP Integrated Services Router
  • Cisco 886VA-CUBE Integrated Services Router
  • Cisco 812 CiFi Integrated Services Router
  • Cisco C897VA Integrated Services Router
  • Cisco 861W Integrated Services Router
  • Cisco VG204XM Analog Voice Gateway
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Known Affected Releases

15.2(4)M 15.2(4)M4.5 15.2(4)M5.6 15.4(1)T1 15.4(1.1)T 15.4(1.24)T

Description (partial)

The output queue gets jammed.

GigabitEthernet0/0 is up, line protocol is up 
  Hardware is iGbE, address is c067.afb3.af00 (bia c067.afb3.af00)
  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec, 
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation 802.1Q Virtual LAN, Vlan ID  1., loopback not set
  Keepalive set (10 sec)
  Full Duplex, 1Gbps, media type is RJ45
  output flow-control is unsupported, input flow-control is XON
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:23:17, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/4096/0/0 (size/max/drops/flushes); Total output drops: 122074
  Queueing strategy: fifo
  Output queue: 40/40 (size/max)
  5 minute input rate 28000 bits/sec, 14 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec

     30424828 packets input, 2555388447 bytes, 0 no buffer
     Received 1194362 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles 
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 56066 multicast, 8 pause input
     26994271 packets output,  1401431052  bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     8537 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     1 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out

1. This symptom is specific to Cisco 3900e Series ISR platforms.  It's not  applicable to other platforms.
2. The problem is observed only with IOS versions containing CSCui05437 fix

The issue occurs with voice IVR packets which internally use kadis timer. The symptom can also occur when BFD is enabled under the interface configuration on a Cisco 3900e Series ISR router.
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