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Cisco Bug: CSCvs08735 - "cable mtu-override" doesn't apply to sub-bundle

Last Modified

Aug 25, 2020

Products (16)

  • Cisco cBR Series Converged Broadband Routers
  • Cisco 4221 Integrated Services Router
  • Cisco 4321 Integrated Services Router
  • Cisco ASR 1002-X Router
  • Cisco 4431 Integrated Services Router
  • Cisco 4331 Integrated Services Router
  • Cisco ASR 1001-X Router
  • Cisco Cloud Services Router 1000V
  • Cisco ASR 1000 Series Route Processor (RP2)
  • Cisco 4451-X Integrated Services Router
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Known Affected Releases

Fuji-16.7.1

Description (partial)

Symptom:
when do 'cable mtu-override' configuration on main bundle, all is good:

### initial state; CODA D31 CM is w-online; 1982B L3 MTU; override is enabled
 
Leonardo#scm 9.6.8.79 ser          
Load for five secs: 6%/0%; one minute: 7%; five minutes: 7%
Time source is NTP, 11:18:33.953 EST Thu Nov 14 2019
 
 
SUMMARY:
MAC Address    IP Address      Host          MAC               Prim  Num Primary        DS
                               Interface     State             Sid   CPE Downstream     RfId
f81d.0f00.f560 9.6.8.79        C9/0/2/UB     w-online          326   0   Do9/0/2:0      57856
 
 
Sfid  Dir Curr  Sid   Sched  Prio MaxSusRate  MaxBrst     MinRsvRate  Throughput
          State       Type
531   US  act   326   BE     0    40000000    28000       0           0         
533   US  act   327   UGS    0    0           0           0           0         
532   DS  act   N/A   N/A    0    200000000   20000       0           87        
 
 
 
UPSTREAM SERVICE FLOW DETAIL:
SFID  SID   Requests   Polls      Grants     Packets  
531   326   1          0          1          1        
533   327   0          0          5921       0        
 
 
DOWNSTREAM SERVICE FLOW DETAIL:
 
SFID  Flg Policer               Scheduler             FrwdIF   
          Xmits      Drops      Xmits      Drops
532       0          0          3          0          Wi9/0/2:0
 
Flags Legend:
$: Low Latency Queue (aggregated)
~: CIR Queue
 
 
 
Leonardo#sh ip cef 9.6.8.79 plat de | i MTU
L3 MTU: 1982
Leonardo#sh run int bun 1 | i mtu  
 cable mtu-override
 
### ping without df-bit succeeds; 20 down, 20 up
 
Leonardo#ping 9.6.8.79 si 1900 re 20
Type escape sequence to abort.
Sending 20, 1900-byte ICMP Echos to 9.6.8.79, timeout is 2 seconds:
!!!!!!!!!!!!!!!!!!!!
Success rate is 100 percent (20/20), round-trip min/avg/max = 6/7/9 ms
Leonardo#scm 9.6.8.79 ser                 
Load for five secs: 7%/0%; one minute: 7%; five minutes: 7%
Time source is NTP, 11:19:21.282 EST Thu Nov 14 2019
 
 
SUMMARY:
MAC Address    IP Address      Host          MAC               Prim  Num Primary        DS
                               Interface     State             Sid   CPE Downstream     RfId
f81d.0f00.f560 9.6.8.79        C9/0/2/UB     w-online          326   0   Do9/0/2:0      57856
 
 
Sfid  Dir Curr  Sid   Sched  Prio MaxSusRate  MaxBrst     MinRsvRate  Throughput
          State       Type
531   US  act   326   BE     0    40000000    28000       0           30736     
533   US  act   327   UGS    0    0           0           0           0         
532   DS  act   N/A   N/A    0    200000000   20000       0           30684     
 
 
 
UPSTREAM SERVICE FLOW DETAIL:
SFID  SID   Requests   Polls      Grants     Packets  
531   326   22         0          22         22       
533   327   0          0          8287       0        
 
 
DOWNSTREAM SERVICE FLOW DETAIL:
 
SFID  Flg Policer               Scheduler             FrwdIF   
          Xmits      Drops      Xmits      Drops
532       0          0          23         0          Wi9/0/2:0
 
Flags Legend:
$: Low Latency Queue (aggregated)
~: CIR Queue
 
 
### ping with df-bit succeeds; 20 down, 20 up
 
 
Leonardo#ping 9.6.8.79 si 1900 re 20 df
Leonardo#ping 9.6.8.79 si 1900 re 20 df-bit
Type escape sequence to abort.
Sending 20, 1900-byte ICMP Echos to 9.6.8.79, timeout is 2 seconds:
Packet sent with the DF bit set
!!!!!!!!!!!!!!!!!!!!
Success rate is 100 percent (20/20), round-trip min/avg/max = 6/7/8 ms
Leonardo#scm 9.6.8.79 ser                  
Load for five secs: 6%/0%; one minute: 7%; five minutes: 7%
Time source is NTP, 11:20:05.369 EST Thu Nov 14 2019
 
 
SUMMARY:
MAC Address    IP Address      Host          MAC               Prim  Num Primary        DS
                               Interface     State             Sid   CPE Downstream     RfId
f81d.0f00.f560 9.6.8.79        C9/0/2/UB     w-online          326   0   Do9/0/2:0      57856
 
 
Sfid  Dir Curr  Sid   Sched  Prio MaxSusRate  MaxBrst     MinRsvRate  Throughput
          State       Type
531   US  act   326   BE     0    40000000    28000       0           30684     
533   US  act   327   UGS    0    0           0           0           0         
532   DS  act   N/A   N/A    0    200000000   20000       0           30684     
 
 
 
UPSTREAM SERVICE FLOW DETAIL:
SFID  SID   Requests   Polls      Grants     Packets  
531   326   42         0          42         42       
533   327   0          0          10491      0        
 
 
DOWNSTREAM SERVICE FLOW DETAIL:
 
SFID  Flg Policer               Scheduler             FrwdIF   
          Xmits      Drops      Xmits      Drops
532       0          0          43         0          Wi9/0/2:0
 
Flags Legend:
$: Low Latency Queue (aggregated)
~: CIR Queue
 


when bundle have sub-bundle, and then ping failure with df-bit ping

Conditions:
there is sub-bundle configured
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