Hirschmann GREYHOUND GRS1020, Справочное руководство

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Redundancy
12.4 The Rapid Spanning Tree Protocol
168
UM Config GRS
Release 8.0 09/2019

Backup port
This is a blocked port that serves as a backup in case the connection to the designated port of
this network segment (without any RSTP bridges) is lost

Disabled port
This is a port that does not participate in the Spanning Tree Operation, that means, the port is
switched off or does not have any connection.
Figure 40: Port role assignment
12.4.2 Port states
Depending on the tree structure and the state of the selected connection paths, the RSTP assigns
the ports their states.
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 for STP-BPDUs
Port 1
Port 2
2
BID = 20 480
3
BID = 24 576
5
BID = 32 768
1
BID = 16 384
7
BID = 40 960
BID = 28 672
4
P-BID
Priority of the bridge identifikation (BID)
= BID without MAC Address
Root path
Interrupted path
Root port
Designated port
Alternate port
Backup port
Edge port
Table 29: Relationship between port state values for STP and RSTP
STP port state Administrative
bridge port state
MAC
Operational
RSTP Port state Active topology (port role)
DISABLED Disabled FALSE
Discarding
1
1. The dot1d-MIB displays “Disabled”
Excluded (disabled)
DISABLED Enabled FALSE
Discarding
a
Excluded (disabled)
BLOCKING Enabled TRUE
Discarding
2
2. The dot1d-MIB displays “Blocked”
Excluded (alternate, backup)
LISTENING Enabled TRUE
Discarding
b
Included (root, designated)
LEARNING Enabled TRUE Learning Included (root, designated)
FORWARDING Enabled TRUE Forwarding Included (root, designated)