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Cisco Bug: CSCuq98231 - CEF Punt Flag is missing on MLPPP inteface once VA interface unbundled

Last Modified

Feb 01, 2017

Products (84)

  • Cisco IOS
  • Cisco 892W Integrated Services Router
  • Cisco C897VA Integrated Services Router
  • Cisco 886VAG 3G Integrated Services Router
  • Cisco 1905 Serial Integrated Services Router
  • Cisco C892FSP Integrated Services Router
  • Cisco 2951 Integrated Services Router
  • Cisco 888W Integrated Services Router
  • Cisco 819 Hardened Integrated Services Router
  • Cisco 812 CiFi Integrated Services Router
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Known Affected Releases

15.4(2)T1

Description (partial)

Symptom:
4 PPP links bundled in MLPPP, when the issue happening we see incomplete entries in the adj table

WS.LARISA.RTR01#sh adjacency 
Protocol Interface                 Address
IP       BVI10                     10.58.9.2(7)
IP       BVI10                     10.58.9.3(7)
IP       Dialer41                  point2point(10) (incomplete)
IP       Dialer42                  point2point(10) (incomplete)
IP       Dialer43                  point2point(10) (incomplete)
IP       Dialer44                  point2point(10) (incomplete)
IP       BVI5                      10.57.9.51(7)
WS.LARISA.RTR01#sh adj
WS.LARISA.RTR01#sh adjacency det
WS.LARISA.RTR01#sh adjacency detail 
Protocol Interface                 Address
IP       BVI10                     10.58.9.2(7)
                                   1216 packets, 90592 bytes
                                   epoch 0
                                   sourced in sev-epoch 0
                                   Encap length 14
                                   544A00AF60411005CA62D6B00800
                                   ARP
IP       BVI10                     10.58.9.3(7)
                                   35 packets, 3150 bytes
                                   epoch 0
                                   sourced in sev-epoch 0
                                   Encap length 14
                                   2834A2CF93411005CA62D6B00800
                                   ARP
IP       Dialer41                  point2point(10) (incomplete)
                                   0 packets, 0 bytes
                                   epoch 0
                                   sourced in sev-epoch 0
                                   punt (rate-limited) packets
                                   P2P-ADJ
IP       Dialer42                  point2point(10) (incomplete)
                                   493 packets, 30886 bytes
                                   epoch 0
                                   sourced in sev-epoch 0
                                   punt (rate-limited) packets
                                   P2P-ADJ
IP       Dialer43                  point2point(10) (incomplete)
                                   0 packets, 0 bytes
                                   epoch 0
                                   sourced in sev-epoch 0
                                   punt (rate-limited) packets
                                   P2P-ADJ
IP       Dialer44                  point2point(10) (incomplete)
                                   3 packets, 414 bytes
                                   epoch 0
                                   sourced in sev-epoch 0
                                   punt (rate-limited) packets
                                   P2P-ADJ
IP       BVI5                      10.57.9.51(7)
                                   9 packets, 936 bytes
                                   epoch 0
                                   sourced in sev-epoch 0
                                   Encap length 14
                                   008092666D1100000CCFDAE00800
                                   ARP
WS.LARISA.RTR01#sh cef
WS.LARISA.RTR01#sh cef in
WS.LARISA.RTR01#sh cef interface dia41
Dialer41 is up (if_number 47)
  Corresponding hwidb fast_if_number 47
  Corresponding hwidb firstsw->if_number 47
  Internet address is 172.25.0.40/32
  ICMP redirects are never sent
  Per packet load-sharing is disabled
  IP unicast RPF check is disabled
  Input features: Dialer i/f override, IPSec input classification, IPSec input vrf switch
  Output features: IPSec output classification, IPSec: to crypto engine, Post-encryption output features, Dialer idle reset, Dialer idle reset
  IP policy routing is disabled
  BGP based policy accounting on input is disabled
  BGP based policy accounting on output is disabled
  Interface is marked as point to point interface
  Hardware idb is Dialer41
  Fast switching type 15, interface type 98
  IP CEF switching enabled
  IP CEF switching turbo vector
  IP Null turbo vector
  VPN Forwarding table "WStores_HOT_SPOT"
  IP prefix lookup IPv4 mtrie 8-8-8-8 optimized
  Input fast flags 0x80, Output fast flags 0x400
  ifindex 23(23)
  Slot  Slot unit -1 VC -1
  IP MTU 1400

Conditions:
Once the Virtual Access interface goes down (getting unbundled from the ppp multilink) , punt bit is removed from the dialer interface and never added back:

# show mon eve cef int all
*Oct 1 13:15:35.555: Vi3 (sw 49) State up -> down
*Oct 1 13:15:35.559: Vi3 (sw 49) FlagCha 0x260C1 del punt
*Oct 1 13:15:35.555: Di41 (sw 37) FlagCha 0x26141 del punt  <<==== flag was deleted from Dialer41 interface
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