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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)

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.

This Issue was seen in Cisco DNA Center versions and, 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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