Port States; Spanning Tree Priority Vector - Hirschmann RS40 User Manual

Rapid Spanning Tree

4.6.2 Port states

Depending on the tree structure and the state of the selected connection
paths, the RSTP assigns the ports their states.
STP port state Administrative
bridge port
state
DISABLED Disabled
DISABLED Enabled
BLOCKING Enabled
LISTENING Enabled
LEARNING Enabled
FORWARDING Enabled
Table 12: Relationship between port state values in STP and RSTP.
* the dot1d MIB shows "Disabled"
** 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 and no data traffic apart from
sending and receiving
Learning = address learning active (FDB) and no data traffic apart from
BPDUs
Forwarding = address learning active (FDB) and sending and receiving
active from all frames (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:
Redundancy L2E
Release 4.1 03/08
4.6 The Rapid Spanning Tree Protocol
MAC RSTP
operational Port state
FALSE Discarding*
FALSE Discarding*
TRUE Discarding** Excluded (alternate, backup)
TRUE Discarding** Included (root, designated)
TRUE Learning
TRUE Forwarding
Active topology
(Port role)
Excluded (disabled)
Excluded (disabled)
Included (root, designated)
Included (root, designated)
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