Virtual Private LAN Services
7750 SR OS Services Guide Page 551
Each spoke SDP has a Read Only operational state that shows which BPDU encapsulation is
currently active on the spoke SDP. The following states apply:
• Dot1d specifies that the switch is currently sending IEEE 802.1D standard BPDUs. The
BPDUs will be tagged or non-tagged based on the encapsulation type of the egress
interface and the encapsulation value defined in the spoke SDP. A spoke SDP defined on
an interface with encapsulation type dot1q will continue in the dot1d BPDU encapsulation
state until a PVST encapsulated BPDU is received, after which the spoke SDP will
convert to the PVST encapsulation state. Each received BPDU must be properly IEEE
802.1q tagged if the interface encapsulation type is defined to dot1q.
• PVST specifies that the switch is currently sending proprietary encapsulated BPDUs.
PVST BPDUs are only supported on Ethernet interfaces with the encapsulation type set to
dot1q. The spoke SDP continues in the PVST BPDU encapsulation state until a dot1d
encapsulated BPDU is received, in which case the spoke SDP reverts to the dot1d
encapsulation state. Each received BPDU must be properly IEEE 802.1q tagged with the
encapsulation value defined for the spoke SDP.
Dot1d is the initial and only spoke SDP BPDU encapsulation state for spoke SDPs defined on
Ethernet interface with encapsulation type set to null.
Each transition between encapsulation types optionally generates an alarm that can be logged and
optionally transmitted as an SNMP trap.
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