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Cisco Bug: CSCun72659 - Incorrect classification stats under show policy-map for slow path pkts

Last Modified

Feb 01, 2017

Products (89)

  • Cisco IOS
  • Cisco 1905 Serial Integrated Services Router
  • Cisco 886VA-CUBE Integrated Services Router
  • Cisco VG204XM Analog Voice Gateway
  • Cisco C897VA Integrated Services Router
  • Cisco 861W Integrated Services Router
  • Cisco 2951 Integrated Services Router
  • Cisco C892FSP Integrated Services Router
  • Cisco 886VAG 3G Integrated Services Router
  • Cisco 812 CiFi Integrated Services Router
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Known Affected Releases

15.2(4)M 15.4(1)T1

Description (partial)

Symptom:
Mis-match between interface output rate and show policy-map interface <> output

Conditions:
Inaccurate statistics will be observed only for the

Fragmented Slow Path Traffic, i.e., only for the

a. Traffic Sourced From Router.
b. Traffic traversing through the router in the absence "ip cef"
c. And if the packet size is more than the interface MTU size, example:

slow path traffic with packet size 6000 bytes passing through a Serial
interface with MTU 3500 bytes.

Below is a sample output:

Serial1/0 is up, line protocol is up
  MTU 3000 bytes, BW 1544 Kbit/sec, DLY 20000 usec,
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: Class-based queueing
  Output queue: 0/1000/0 (size/max total/drops)
  30 second input rate 565000 bits/sec, 37 packets/sec
  30 second output rate 566000 bits/sec, 37 packets/sec
                       ^^^^^^^^
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     3054 packets output, 6067106 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 unknown protocol drops
     0 carrier transitions     DCD=up  DSR=up  DTR=up  RTS=up  CTS=up

  Service-policy output: WAN_shape_out
      30 second offered rate 286000 bps, drop rate 0000 bps
                            ^^^^^^^^
      shape (average) cir 2048000, bc 8192, be 8192
      target shape rate 2048000
          30 second offered rate 0000 bps, drop rate 0000 bps
            30 second rate 0 bps
          30 second offered rate 0000 bps, drop rate 0000 bps
            30 second rate 0 bps
          30 second offered rate 286000 bps, drop rate 0000 bps
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