Guest

Preview Tool

Cisco Bug: CSCvs67738 - A9K-SIP-700 / SPA-2XCHOC12/DS0 output errors increments on oversubscribed interface with qos policy

Last Modified

Mar 27, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

6.5.3.BASE

Description (partial)

Symptom:
A9K-SIP-700 / SPA-2XCHOC12/DS0 and cXR 6.5.3:

1. Having output policer applied on serial interface:
RP/0/RSP0/CPU0:ASR9006-E#sh run int serial 0/2/0/0/1/1
Mon Dec 16 16:25:41.573 UTC
interface Serial0/2/0/0/1/1
description 0300004-1-1#u#coco-v6##44L//SK//SK49/9124/1/8TEL//49/9124/140/7Y47//34#Test_Null GmbH
bandwidth 34010
cdp
service-policy input fp_Subrate_34010
service-policy output tp_Subrate_NMS5_34010
ipv4 address 7.7.7.1 255.255.255.0
ipv4 verify unicast source reachable-via rx
ipv6 verify unicast source reachable-via rx
ipv6 address 2003:4:f022:a170::1/64
ipv6 enable
encapsulation ppp
serial
  crc 32
!
load-interval 30
!

RP/0/RSP0/CPU0:ASR9006-E#sh run policy-map tp_Subrate_NMS5_34010
Mon Dec 16 16:25:52.557 UTC
policy-map tp_Subrate_NMS5_34010
class class-default
  service-policy to_line_BE_E3
  shape average 33984000 bps
!
end-policy-map
!

RP/0/RSP0/CPU0:ASR9006-E#sh run policy-map to_line_BE_E3
Mon Dec 16 16:26:03.725 UTC
policy-map to_line_BE_E3
class NMS_IP
  bandwidth percent 5
  random-detect 169984 bytes 339968 bytes
!
class class-default
  random-detect 382464 bytes 1638400 bytes
!
end-policy-map


when sending more traffic than interface bandwidth output errors are incrementing besides expected drops:
RP/0/RSP0/CPU0:ASR9006-E#sh int serial 0/2/0/0/1/1
Fri Dec 13 23:22:44.932 UTC
Serial0/2/0/0/1/1 is up, line protocol is up
...
  30 second input rate 24758000 bits/sec, 2083 packets/sec
  30 second output rate 33462000 bits/sec, 2815 packets/sec
     8956338 packets input, 1503603926 bytes, 524855 total input drops
     0 drops for unrecognized upper-level protocol
     Received 0 runts, 0 giants, 0 throttles, 0 parity
     219042 input errors, 468 CRC, 0 frame, 0 overrun, 0 ignored, 796 abort
     10082417 packets output, 1735435128 bytes, 31019 total output drops
     15616 output errors, 0 underruns, 0 applique, 0 resets
     0 output buffer failures, 0 output buffers swapped out

Conditions:
More traffic than interface bandwidth.
Bug details contain sensitive information and therefore require a Cisco.com account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.