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Cisco Bug: CSCuw28129 - After link flap, HW adj might be incorrectly programmed on LC

Last Modified

Aug 04, 2016

Products (1)

  • Cisco 7600 Series Routers

Known Affected Releases

15.0(1)S5

Description (partial)

Symptom:
Traffic drop for some VPN traffic which hits corrupted entry

#ping vrf Inband-Mgmt 152.98.128.66       
 
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 152.98.128.66, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)

-dfc3#show mls cef vpn  259 192.168.103.204 detail 
Codes: M - mask entry, V - value entry, A - adjacency index, P - priority bit
       D - full don't switch, m - load balancing modnumber, B - BGP Bucket sel
       V0 - Vlan 0,C0 - don't comp bit 0,V1 - Vlan 1,C1 - don't comp bit 1
       RVTEN - RPF Vlan table enable, RVTSEL - RPF Vlan table select
Format: IPV4_DA - (8 | xtag vpn pi cr recirc tos prefix)
Format: IPV4_SA - (9 | xtag vpn pi cr recirc prefix)
M(91019  ): E | 1 FFF  0 0 0 0   255.255.255.252
V(91019  ): 8 | 1 259  0 0 0 0   192.168.103.204    (A:518341 ,P:1,D:0,m:1 ,B:0 )
 
 
##########################
Index: 518342  smac: 0000.0000.0000, dmac: 001b.0de4.4a00
               mtu: 65535, vlan: 4082, dindex: 0x7FFA, l3rw_vld: 1
               format: MPLS, flags: 0x1000208710 
               label0: 1505, exp: 0, ovr: 0
               label1: 16097, exp: 0, ovr: 0
               label2: 526346, exp: 0, ovr: 0
               op: PUSH_LABEL2_LABEL1_LABEL0
               packets: 0, bytes: 0
 
-dfc3#show mls cef adjacency entry 518341 to 518342 detail 
Index: 518341  smac: 0000.0000.0000, dmac: 001b.0de4.4a00
               mtu: 65535, vlan: 4082, dindex: 0x7FFA, l3rw_vld: 1
               format: MPLS, flags: 0x1000208710 
               label0: 1505, exp: 0, ovr: 0
               label1: 16104, exp: 0, ovr: 0
               label2: 526338, exp: 0, ovr: 0
               op: PUSH_LABEL2_LABEL1_LABEL0
               packets: 0, bytes: 0
 
 
#########################
 
-dfc3#show mls cef mpls labels 526346 detail 
Codes: M - mask entry, V - value entry, A - adjacency index, P - FIB Priority
       D - FIB Don't short-cut, m - mod-num, E - ELSP?
Format: MPLS - (b | xtag vpn pi cr mcast label1 exp1 eos1 valid2 label2 exp2 eos2)
V(2117   ): B | 1 0    0 1 0 526346  0 0 0 0       0 0 (A:475932 ,P:0,D:0,m:0 :E:1)
M(2117   ): F | 1 FFF  0 1 1 FFFFF   0 0 0 0       0 0
 
 
 
-dfc3#show mls cef adjacency entry 475932 detail (Correct)
Index: 475932  smac: 001b.0de4.4a00, dmac: e0ac.f15e.0850
               mtu: 4488, vlan: 3834, dindex: 0x0, l3rw_vld: 1
               format: MPLS, flags: 0x1000008408 
               label0: 0, exp: 0, ovr: 0
               label1: 0, exp: 0, ovr: 0
               label2: 0, exp: 0, ovr: 0
               op: POP
               packets: 15108, bytes: 2570611
 
#show vlan internal usage | in 3834
3834 TenGigabitEthernet4/1
 
 
dfc3#show mls cef mpls labels 526338 detail 
Codes: M - mask entry, V - value entry, A - adjacency index, P - FIB Priority
       D - FIB Don't short-cut, m - mod-num, E - ELSP?
Format: MPLS - (b | xtag vpn pi cr mcast label1 exp1 eos1 valid2 label2 exp2 eos2)
V(2127   ): B | 1 0    0 1 0 526338  0 0 0 0       0 0 (A:508017 ,P:0,D:0,m:0 :E:1)
M(2127   ): F | 1 FFF  0 1 1 FFFFF   0 0 0 0       0 0
 
-dfc3#show mls cef adjacency entry 508017 detail   (Corrupted)
Index: 508017  smac: 0000.0000.0000, dmac: 0000.0000.0000
               mtu: 0, vlan: 0, dindex: 0x0, l3rw_vld: 0
               format: MAC_TCP, flags: 0x800 
               delta_seq: 0, delta_ack: 0
               packets: 0, bytes: 0

Conditions:
The symptom is observed after a link flap
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