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Cisco Bug: CSCvv19238 - SDA - Changing the L2 handoff interface deletes L2 handoff SVI from border

Last Modified

Sep 02, 2020

Products (1)

  • Cisco DNA Center

Known Affected Releases

DNAC-Antman DNAC-Cyclops

Description (partial)

Symptom:
Currently, Cisco DNA Center allows a user to change the L2 handoff interface on-the-fly.  Changing the L2 handoff interface from FortyGigabitEthernet1/0/16 to FortyGigabitEthernet1/0/15 on the border results in the deletion of the external VLAN SVI(VLAN 999 in this case).  This causes a network outage, as external hosts cannot get registered to the control plane.  The "show logging" output from the device may include lines similar to these.  

*Jul 29 16:32:26.867: %HA_EM-6-LOG: CLI_COMMANDS-->: enable 
*Jul 29 16:32:26.875: %HA_EM-6-LOG: CLI_COMMANDS-->: terminal length 0
*Jul 29 16:32:26.886: %HA_EM-6-LOG: CLI_COMMANDS-->: terminal width 0
*Jul 29 16:32:26.903: %HA_EM-6-LOG: CLI_COMMANDS-->: show running-config 
*Jul 29 16:32:27.459: %HA_EM-6-LOG: CLI_COMMANDS-->: configure terminal 
*Jul 29 16:32:27.481: %HA_EM-6-LOG: CLI_COMMANDS-->: no ip dhcp snooping vlan 999
*Jul 29 16:32:27.497: %HA_EM-6-LOG: CLI_COMMANDS-->: no interface Vlan999 <<<<<<<<<<<<<<<<<<<<<<<<<<<<
*Jul 29 16:32:29.485: %LINK-5-CHANGED: Interface Vlan999, changed state to administratively down
*Jul 29 16:32:29.514: %HA_EM-6-LOG: CLI_COMMANDS-->: no cts role-based enforcement vlan-list 999
*Jul 29 16:32:29.529: %HA_EM-6-LOG: CLI_COMMANDS-->: interface FortyGigabitEthernet1/0/15 
*Jul 29 16:32:29.548: %HA_EM-6-LOG: CLI_COMMANDS-->: no spanning-tree portfast 
*Jul 29 16:32:29.563: %HA_EM-6-LOG: CLI_COMMANDS-->: no switchport voice vlan 
*Jul 29 16:32:29.577: %HA_EM-6-LOG: CLI_COMMANDS-->: no switchport access vlan 
*Jul 29 16:32:29.585: %HA_EM-6-LOG: CLI_COMMANDS-->: switchport 
*Jul 29 16:32:29.597: %HA_EM-6-LOG: CLI_COMMANDS-->: switchport mode trunk 
*Jul 29 16:32:29.617: %HA_EM-6-LOG: CLI_COMMANDS-->: switchport trunk allowed vlan all 
*Jul 29 16:32:29.623: %HA_EM-6-LOG: CLI_COMMANDS-->: exit 
*Jul 29 16:32:29.645: %HA_EM-6-LOG: CLI_COMMANDS-->: interface FortyGigabitEthernet1/0/16 
*Jul 29 16:32:29.659: %HA_EM-6-LOG: CLI_COMMANDS-->: no load-interval 
*Jul 29 16:32:29.667: %HA_EM-6-LOG: CLI_COMMANDS-->: no spanning-tree portfast 
*Jul 29 16:32:29.678: %HA_EM-6-LOG: CLI_COMMANDS-->: no switchport voice vlan 
*Jul 29 16:32:29.691: %HA_EM-6-LOG: CLI_COMMANDS-->: no switchport access vlan 
*Jul 29 16:32:29.710: %HA_EM-6-LOG: CLI_COMMANDS-->: switchport mode dynamic auto 
*Jul 29 16:32:29.714: %HA_EM-6-LOG: CLI_COMMANDS-->: exit 

Reprovisioning the border doesn't help restoring the external VLAN SVI.

Conditions:
This Issue was seen in Cisco DNA Center versions 1.3.3.6 and 2.1.1.3, when changing the L2 handoff interface.
This issue is not seen when navigating to the Layer 2 Handoff page, removing the external VLANs and old L2 handoff interface and saving, then adding external VLANs and a new L2 handoff interface and saving.
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