Spanning Tree Priority Vector - Hirschmann RS20 User Manual

Spanning Tree
STP port state Administrative
bridge port
state
DISABLED Disabled
DISABLED Enabled
BLOCKING Enabled
LISTENING Enabled
LEARNING Enabled
FORWARDING Enabled
Table 7: Relationship between port state values for STP and RSTP
a. The dot1d MIB shows "Disabled
b. The dot1d MIB shows "Blocked"
Meaning of the RSTP port states:
Disabled: port does not belong to the active topology
Discarding: no address learning in FDB, no data traffic except BPDUs
Learning: address learning active (FDB), no data traffic except BPDUs
Forwarding: address learning active (FDB), sending and receiving of all
frame types (not only BPDUs)
4.6.3

Spanning Tree Priority Vector

To assign roles to the ports, the RSTP bridges exchange configuration
information with each other. This information is known as the Spanning Tree
Priority Vector. It is part of the RST BPDUs and contains the following
information:
Bridge identifier of the root bridge
Root path costs for the sending bridge
Bridge identifier for the sending bridge
Port identifiers of the port through which the message was sent
Port identifiers of the port that has received the message
56
MAC RSTP
operational Port state
FALSE Discarding
FALSE Discarding
TRUE Discarding
TRUE Discarding
TRUE Learning
TRUE Forwarding
4.6 The Rapid Spanning Tree
Active topology
(port role)
a
Excluded (disabled)
a
Excluded (disabled)
b
Excluded (alternate, backup)
b
Included (root, designated)
Included (root, designated)
Included (root, designated)
Release 6.0 07/2010
Protocol
Redundancy