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Cisco Bug: CSCur75415 - MPLS leaf with no control flags set count --- ospf flapping

Last Modified

Jan 08, 2017

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases

5.4.0.BASE

Description (partial)

Symptom:
With mpls static configured, just two mpls static routes. TOPOLOGY: IXIA ---sunstone----asr9k--IXIA

With the traffic running, I saw the following counters incrementing rapidly. The ospf is flapping for some time.
----------------
UVF: show dpa stat glo
Index  Name                                                            Count
  34   From Fabric inject packets                                         51
  44   NP Port inject packets                                             13
  46   Preroute PIT packets                                               38
1560   MPLS leaf with no control flags set                            223803
1923   Punt for ICMP                                                       4
1944   Punt unknown IFIB                                                  65
UVF:                         

P/0/RP0/CPU0:ott02-sim-09-uut#
RP/0/RP0/CPU0:ott02-sim-09-uut#RP/0/RP0/CPU0:Nov 17 19:59:57.133 : config[66280]: %MGBL-CONFIG-6-DB_COMMIT : Configuration committed by user 'root'. Use 'show configuration commit changes 1000000024' to view the changes.
RP/0/RP0/CPU0:Nov 17 19:59:57.315 : ospf[1014]: %ROUTING-OSPF-5-ADJCHG : Process 100, Nbr 101.0.0.2 on TenGigE0/RP0/CPU0/2 in area 0 from LOADING to FULL, Loading Done, vrf default vrfid 0x60000000
RP/0/RP0/CPU0:Nov 17 20:00:00.095 : ospf[1014]: %ROUTING-OSPF-5-ADJCHG : Process 100, Nbr 102.0.0.1 on TenGigE0/RP0/CPU0/3 in area 0 from LOADING to FULL, Loading Done, vrf default vrfid 0x60000000
RP/0/RP0/CPU0:Nov 17 20:00:01.059 : config[66280]: %MGBL-SYS-5-CONFIG_I : Configured from console by root

UVF: show dpa stat global
Index  Name                                                            Count
  34   From Fabric inject packets                                        368
  44   NP Port inject packets                                             13
  46   Preroute PIT packets                                              327
1560   MPLS leaf with no control flags set                          12535093
1806   Punt ARP                                                           13
1944   Punt unknown IFIB                                                 679
UVF:
UVF: show dpa global stat
show dpa: unknown input `global stat'
UVF: show dpa stat glo
Index  Name                                                            Count
  34   From Fabric inject packets                                        506
  44   NP Port inject packets                                             19
  46   Preroute PIT packets                                              449
1560   MPLS leaf with no control flags set                          17153882
1806   Punt ARP                                                           19
1944   Punt unknown IFIB                                                 929
UVF: show errors
      Count                       Node                         Reason
      1532015088                ant-input               packets received
      1532107677               ant-ingress              packets received
       149565194               ant-ingress              ant-ingress drop
      1457155008               ant-egress               packets received
      1457325080               ant-output               packets received
      1457325080                 ant-tx                 packets received
         3815405                 ant-tx                 no punt buffer drop for priority 1
         1312023                 ant-tx                 punt processing
      1457325080                tb-output               packets received
      1457155008              tb-output-fab             packets received
      1355523969               ant-plu-ing              packets received
UVF:

Conditions:
Image:
Nov' 14's image with fixes from Todd.

RP/0/RP0/CPU0:ott02-sim-09-uut#sh version
Mon Nov 17 21:14:19.138 UTC

Cisco IOS XR Software, Version 5.3.0.03C
Copyright (c) 2013-2014 by Cisco Systems, Inc.

Build Information:
 Built By     : yuyou
 Built On     : Fri Nov 14 13:22:23 EST 2014
 Build Host   : ott-lb-012
 Workspace    : /workspace2/yuyou/dpc-rm-bugfix
 Version      : 5.3.0.03C
 Location     : /opt/cisco/XR/packages/

System uptime is 19 hours, 17 minutes

RP/0/RP0/CPU0:ott02-sim-09-uut#

RP/0/RP0/CPU0:ott02-sim-09-uut#run cat /etc/build*txt
Mon Nov 17 21:14:44.118 UTC
### XR Information

User = yuyou
Host = ott-lb-012
Workspace = /workspace2/yuyou/dpc-rm-bugfix
Lineup = sunstone-dev.lu
XR version = 5.3.0.03C

### Thirdparty Information

Refpoint = thirdparty/opensource/release@tp-graphene2/10
Hostname     : sjc-ads-2908
 Workspace    : /nobackup/aselvana/pts/tp_test
 Source Base  : ios_ena
 Devline      : tp-graphene2.lu
 Devline Ver  : unknown
 Devline Type : ACME Project (Devline uses a project: tp-graphene2%14)

### Calvados Information for architecture

Refpoint = calvados/release@flex-531/5
Built By     : yuyou
 Built On     : Fri Nov 14 07:13:29 EST 2014
 Build Host   : ott-lb-012
 Workspace    : /workspace2/yuyou/dpc-rm-bugfix
 Source Base  : ios_ena
 Devline      : sunstone-dev.lu
 Devline Type : ACME Project (Devline uses a project: sunstone-dev%134)
 sunstone-dev   EFR-00000290564   Project
 flex-531       EFR-00000286524   Project
 flex-xr        EFR-00000283233   Project
 ci-531         EFR-00000282550   Lineup
 ci-530         EFR-00000282350   Lineup
 ci-522         EFR-00000280208   Lineup
 ci-521         EFR-00000277817   Lineup
 default        EFR-00000276591   Lineup
RP/0/RP0/CPU0:ott02-sim-09-uut#
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