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Cisco Bug: CSCvs36710 - C9606R/ 16.12.1 & 16.12.2 / standby supervisor will not sync 'ipv6 unicast-routing' command

Last Modified

Jan 15, 2020

Products (6)

  • Cisco IOS
  • Cisco Catalyst 9800-40 Wireless Controller
  • Cisco Catalyst 9800-L-C Wireless Controller
  • Cisco Catalyst 9800-80 Wireless Controller
  • Cisco Catalyst 9800-L-F Wireless Controller
  • Cisco Catalyst 9800-CL Wireless Controller for Cloud

Known Affected Releases

16.12.1s 16.12.2 16.12.2s

Description (partial)

Symptom:
Hardware: C9606R
Software: 16.12.1

Anytime that customer is adding a line on BGP or OSPFV3, the standby will be reloaded.

This is because the active is not sync the 'ipv6 unicast-routing' command to standby.

Example: 


Switch(config)#router bgp 65050
Switch(config-router)#bgp router-id 111.6.0.11
Switch(config-router)#address-family ipv6 unicast 


++ Now the stby sup reloaded itself


Switch#wr memory 

Switch#sh logging | b Nov 28 10:  


Nov 28 10:13:18.477: Config Sync: Line-by-Line sync verifying failure on command:
  address-family ipv6 unicast 
due to parser return error


++ Same behavior on Cisco lab 



Switch(config)#router bgp 65050
Switch(config-router)#bgp router-id 111.6.0.11
Switch(config-router)#address-family ipv6 unicast

*Dec  6 10:28:40.014: Config Sync: Line-by-Line sync verifying failure on command:
  address-family ipv6 unicast
due to parser return error

Switch(config-router-af)#
*Dec  6 10:28:41.948: %RF-5-RF_RELOAD: Peer reload. Reason: Configuration mismatch
*Dec  6 10:28:41.949: %CMRP-3-RP_RESET: R1/0: cmand: RP is resetting : remote RP requested reset of this RP
*Dec  6 10:28:44.098: %IOSXE_OIR-6-OFFLINECARD: Card (rp) offline in slot R1
Switch(config-router-af)#
*Dec  6 10:28:44.183: %REDUNDANCY-3-STANDBY_LOST: Standby processor fault (PEER_NOT_PRESENT)
*Dec  6 10:28:44.183: %REDUNDANCY-3-STANDBY_LOST: Standby processor fault (PEER_DOWN)
*Dec  6 10:28:44.183: %REDUNDANCY-3-STANDBY_LOST: Standby processor fault (PEER_REDUNDANCY_STATE_CHANGE)
*Dec  6 10:28:44.053: %CMRP-6-RP_SB_RELOAD_REQ: R0/0: cmand: Reloading Standby RP: initiated by RF reload message
*Dec  6 10:28:46.132: %RF-5-RF_RELOAD: Peer reload. Reason: EHSA standby down
*Dec  6 10:28:46.139: %IOSXE_REDUNDANCY-6-PEER: Active detected switch -1 as standby.
Switch(config-router-af)#


************************
behavior with work around 
************************


Switch(config-red)#no policy config-sync lbl prc reload
Switch(config-red)#no policy config-sync lbl  bem reload
Switch(config-red)#no policy config-sync bulk prc reload
Switch(config-red)#no policy config-sync bulk bem reload
Switch(config-red)#
Switch(config-red)#
Switch(config-red)#
*Dec  6 10:48:20.052: %PARSE_RC-4-PRC_NON_COMPLIANCE: `no policy config-sync lbl  bem reload'
*Dec  6 10:48:20.986: %PARSE_RC-4-PRC_NON_COMPLIANCE: `no policy config-sync bulk bem reload'edn
                    ^

Switch(config)#no router bgp 65050
Switch(config)#
Switch(config)#
Switch(config)#router bgp 65050
Switch(config-router)#bgp router-id 111.6.0.11
Switch(config-router)#address-family ipv6 unicast
Switch(config-router-af)#
Switch(config-router-af)#
*Dec  6 10:49:12.222: Config Sync: Line-by-Line sync verifying failure on command:
  address-family ipv6 unicast
due to parser return error


++ active switch 


Switch#show run | sec r b
router bgp 65050
 bgp router-id 111.6.0.11
 bgp log-neighbor-changes
 !
 address-family ipv6
 exit-add

Peer Processor Information :
----------------------------
              Standby Location = slot 4
        Current Software state = STANDBY HOT
       Uptime in current state = 16 minutes
                 Image Version = Cisco IOS Software [Gibraltar], Catalyst L3 Switch Software (CAT9K_IOSXE), Version 16.12.1, RELEASE SOFTWARE (fc4)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2019 by Cisco Systems, Inc.
Compiled Tue 30-Jul-19 19:26 by mcpre
                          BOOT = bootflash:cat9k_iosxe.16.12.01.SPA.bin;
                   CONFIG_FILE =
        Configuration register = 0x102


++ after the switch over to standby, on standby switch 

Switch#show run | sec r b
router bgp 65050
 bgp router-id 111.6.0.11
 bgp log-neighbor-changes
Switch#



+++++

Now, seems that the issue can be with IPV6 configuration 


* from active switch when fails 

Switch#show run | in unicast
ipv6 unicast-routing
 ip verify unicast source reachable-via rx allow-self-ping


* from standby switch - after siwtchover is new Active 

Switch#show run | in unicast
 ip verify unicast source reachable-via rx allow-self-ping
Switch#

* No Ipv6 unicast 

Seems that ipv6 unicast command is being erased and not able to configure back IPV6

Switch(config)#router bgp 65050
Switch(config-router)#bgp router-id 111.6.0.11
Switch(config-router)#address-family ipv6 unicast
% IPv6 routing not enabled                  <<<<<<<<<<<<<  and  was configure on switch. 
Switch(config-router)#

Conditions:
Hardware: C9606R
Software: 16.12.1

Run with 2 supervisors


Chassis Type: C9606R

Mod Ports Card Type                                   Model          Serial No.
---+-----+--------------------------------------+--------------+--------------
1   48   48-Port 10GE / 25GE                         C9600-LC-48YL    CAT8888L1BX
3   0    Supervisor 1 Module                         C9600-SUP-1      CAT8888L36T
4   0    Supervisor 1 Module                         C9600-SUP-1      CAT8888L358

Mod MAC addresses                    Hw   Fw           Sw                 Status
---+--------------------------------+----+------------+------------------+--------
1   4C71.4C71.3780 to 4C71.0D7D.4C71 1.0  16.12.1[FC2]  16.12.01           ok        
3   4C71.A901.4C71 to 084F.4C71.A4FF 1.0  16.12.1[FC2]  16.12.01           ok        
4   4C71.37CA.4C71 to 4C71.37CA.41FF 1.0  16.12.1[FC2]  16.12.01           ok        

Mod Redundancy Role     Operating Redundancy Mode Configured Redundancy Mode
---+-------------------+-------------------------+---------------------------
3   Active              sso                       sso                       
4   Standby             sso                       sso                       


+ configure IPV6, can be BGP or OSPFV3
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