VIAVI TestCenter-Automation: RSTP BPDU appends 64 to Bridge MAC when port type set to 'Access'

• While configuring RSTP Bridge, if the port type is set to ‘ACCESS’, the BPDU captured shows a different bridge Identifier by appending 64 to the last octet of MAC address. Root Identifier: 32768 / 0 / 00:00:10:00:10:64 Bridge Identifier: 32768 / 0 / 00:00:10:00:10:64 • Whereas, if the RSTP bridge is configured with port type set to ‘TRUNK’, the MAC address is not modified. Root Identifier: 32768 / 0 / 00:00:10:00:10:00 Bridge Identifier: 32768 / 0 / 00:00:10:00:10:00 • Ideally, the last octet of Bridge ID represents the ‘Start Vlan’ while configuring RPVST or PVST bridge. Even though the Vlan is not present in RSTP bridge configuration, the last octet is showing some default value of 64 with RSTP (port type set to Access). • Expected is that when the STP type is RSTP, no port type should be enabled, and by default vlan tagging should not be done. • While automating if the port type if not set to anything, the previous settings are applied to port type. i.e. if in the script, the bridge created earlier has port  type as 'access', even though the RSTP bridge is not specified with any port type, it takes 'access'. • Thus, if RSTP is designed to work only with port type 'trunk', we should not be able to change the port type to 'access'.

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