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STP Topology Changes are generated even though only the edge port is flapped

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TitleSTP Topology Changes are generated even though only the edge port is flapped
Symptoms
The STP port link-type configuration is not retained when a untagged port is deleted from a VLAN which is part of STP domain and then added in another VLAN which is also part of the STP domain resulting in the port behaving like a normal STP port even though the configuration is displayed in <show configuration stpd>. Like in a following example:

* X450G2-24p-G4.9 # show configuration stp
#
# Module stp configuration.
#
configure stpd s0 mode dot1w
enable stpd s0 auto-bind vlan v10
configure stpd s0 ports link-type edge 24
configure stpd s0 ports edge-safeguard enable 24
configure stpd s0 ports bpdu-restrict enable 24
enable stpd s0

* X450G2-24p-G4.10 # show stp s0 port 24 detail
Stpd: s0   Port: 24   PortId: 8018    Stp: ENABLED    Path Cost: 20000
Port Mode         : 802.1D      Port Role          : Designated
Port State        : FORWARDING       Topology Change Ack: FALSE
Port Priority     : 128
Designated Root   : 80:00:00:04:96:99:99:dd     Designated Cost: 0
Designated Bridge : 80:00:00:04:96:99:99:dd     Designated Port Id: 8018
Partner STP version     : Dot1w
Restricted Role         : Disabled
Active Role             : Disabled
Edge Port Safe Guard    : Enabled
Bpdu Restrict           : Enabled
Restricted TCN          : Off
Loop Protect            : Off
Loop Protect Partner    : Incapable
Operational Edge        : FALSE
Auto Edge               : On
Participating Vlans: v10
Environment
  • STP 
  • EXOS 16.2.3.5p1-2 and higher
Cause
This is a software bug.
Resolution
CR xos0070993 ​has been created to track it. Its currently earmarked to be resolved in EXOS 22.5.1.
Additional notes

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