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Cisco Bug: CSCus75852 - Sunstone: Injected packets are not load balanced

Last Modified

Aug 06, 2018

Products (1)

  • Cisco IOS XRv Router

Known Affected Releases

5.4.0.BASE

Description (partial)

Symptom:
RP/0/RP0/CPU0:ott02-sim-012-uut#sh isis nei

IS-IS 100 neighbors:
System Id      Interface        SNPA           State Holdtime Type IETF-NSF
ott02-sim-012-r1 Gi0/RP0/CPU0/2.1 5246.018d.3ae0 Up    8        L2   Capable
ott02-sim-012-r1 Gi0/RP0/CPU0/2.2 5246.018d.3ae0 Up    9        L2   Capable
0200.6d01.0902 Gi0/RP0/CPU0/0.1 5254.001d.b833 Up    24       L2   Unable

Total neighbor count: 3
RP/0/RP0/CPU0:ott02-sim-012-uut#
RP/0/RP0/CPU0:ott02-sim-012-uut#sh int GigabitEthernet0/RP0/CPU0/2.2 accRP/0/RP0/CPU0:Feb  2 14:33:08.421 UTC: isis[1010]: %ROUTING-ISIS-4-LSPTOOBIG : L2 LSP 0200.6d01.0902.00-02 size 1492 bigger than interface GigabitEthernet0/RP0/CPU0/2.2 MTU 1489, LSP dropped
RP/0/RP0/CPU0:Feb  2 14:33:09.421 UTC: isis[1010]: %ROUTING-ISIS-4-SNPTOOBIG : L2 SNP size 1492 too big for interface GigabitEthernet0/RP0/CPU0/2.2 MTU 1489, trimmed to interface MTU

GigabitEthernet0/RP0/CPU0/2.2
  Protocol              Pkts In         Chars In     Pkts Out        Chars Out
  IPV4_UNICAST                6              420            0                0
  IPV4_MULTICAST              0                0            5              350
  MPLS                        0                0         6782          5204827
  CLNS                       14            17048            6             4956


RP/0/RP0/CPU0:ott02-sim-012-uut#sh int GigabitEthernet0/RP0/CPU0/2.1 acc
GigabitEthernet0/RP0/CPU0/2.1
  Protocol              Pkts In         Chars In     Pkts Out        Chars Out
  IPV4_UNICAST                5              350          178          5701070
  IPV4_MULTICAST              0                0            5              350
  MPLS                        0                0         7388          5710812
  CLNS                       16            20026            6             4956


RP/0/RP0/CPU0:ott02-sim-012-uut#

RP/0/RP0/CPU0:ott02-sim-012-uut#config t
int RP/0/RP0/CPU0:ott02-sim-012-uut(config)#int GigabitEthernet0/RP0/CPU0/2.2
RP/0/RP0/CPU0:ott02-sim-012-uut(config-subif)#shut
RP/0/RP0/CPU0:ott02-sim-012-uut(config-subif)#commit
RP/0/RP0/CPU0:ott02-sim-012-uut(config-subif)#
RP/0/RP0/CPU0:ott02-sim-012-uut(config-subif)#no shut
RP/0/RP0/CPU0:ott02-sim-012-uut(config-subif)#commit

RP/0/RP0/CPU0:ott02-sim-012-uut#sh int GigabitEthernet0/RP0/CPU0/2.1 acc
GigabitEthernet0/RP0/CPU0/2.1
  Protocol              Pkts In         Chars In     Pkts Out        Chars Out
  IPV4_UNICAST                2              140           16           521200
  IPV4_MULTICAST              0                0            1               70
  MPLS                        0                0         2034          1581850
  CLNS                        2             2978            0                0


RP/0/RP0/CPU0:ott02-sim-012-uut#sh int GigabitEthernet0/RP0/CPU0/2.2 acc
GigabitEthernet0/RP0/CPU0/2.2
  Protocol              Pkts In         Chars In     Pkts Out        Chars Out
  IPV4_UNICAST                3              210            0                0
  IPV4_MULTICAST              0                0            2              140    --this is no MPLS pkts out
  CLNS                        6             7668            2             1652


RP/0/RP0/CPU0:ott02-sim-012-uut#RP/0/RP0/CPU0:Feb  2 14:35:13.875 UTC: isis[1010]: %ROUTING-ISIS-4-LSPTOOBIG : L2 LSP 0200.6d01.0902.00-02 size 1492 bigger than interface GigabitEthernet0/RP0/CPU0/2.1 MTU 1489, LSP dropped
RP/0/RP0/CPU0:Feb  2 14:35:14.875 UTC: isis[1010]: %ROUTING-ISIS-4-SNPTOOBIG : L2 SNP size 1492 too big for interface GigabitEthernet0/RP0/CPU0/2.1 MTU 1489, trimmed to interface MTU

RP/0/RP0/CPU0:ott02-sim-012-uut#
RP/0/RP0/CPU0:ott02-sim-012-uut#sh int GigabitEthernet0/RP0/CPU0/2.2 acc
GigabitEthernet0/RP0/CPU0/2.2
  Protocol              Pkts In         Chars In     Pkts Out        Chars Out
  IPV4_UNICAST               18             1260            0                0
  IPV4_MULTICAST              0                0           17             1190
  CLNS                       46            56380           18            14868

UVF: show dpa stat global
Index  Name                                                            Count
  34   From Fabric inject packets                                        325
  44   NP Port inject packets                                           5817
  48   Preroute PIT packets                                              271
  98   IPv4 disabled in the UIDB drop                                    123
 124   IPv6 disabled in the UIDB drop                                     26
1908   Punt adj                                                         5781
1909   Punt adj (policer drop)                                        165453
1944   Punt unknown IFIB                                                 379
UVF: show dpa stat global
Index  Name                                                            Count
  34   From Fabric inject packets                                        367
  44   NP Port inject packets                                           6617
  48   Preroute PIT packets                                              310
  98   IPv4 disabled in the UIDB drop                                    142
 124   IPv6 disabled in the UIDB drop                                     30
1908   Punt adj                                                         6573
1909   Punt adj (policer drop)                                        188126
1944   Punt unknown IFIB                                                 433
UVF:

Conditions:
image:
Refpoint = calvados/release@flex-xr-twig/2
Built By     : kentp
 Built On     : Sun Feb  1 18:30:17 EST 2015
 Build Host   : rtp-ads-552
 Workspace    : /nobackup/kentp/pims/nightly_flex-xr-twig/Sun/workspace
 Source Base  : ios_ena
 Devline      : flex-xr-twig/flex-xr-twig.lu%FLEX-XR-TWIG_NIGHTLY_15_02_01
 Devline Type : ACME Project (Devline uses a project: flex-xr-twig%112)
 flex-xr-twig   EFR-00000296085   Project
 flex-xr        EFR-00000294743   Project
 ci-531         EFR-00000292004   Lineup
 ci-530         EFR-00000290307   Lineup
 default        EFR-00000289219   Lineup
RP/0/RP0/CPU0:ott02-sim-09-uut#                   

This issue is seen on both virtual gig and physical ten testbeds with ISIS only. For ospf, the traffic can pass without any issue.
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