Allied Telesis at-8516f User Guide
90
Rapier Switch User Guide
Software Release 2.6.1
C613-02025-00 REV C
C613-02025-00 REV C
A spanning tree running in standard mode can take up to one minute to rebuild
after a topology or configuration change. The Rapid Spanning Tree algorithm
provides for a more rapid recovery of connectivity following the failure of a
bridge, bridge port, or a LAN.
after a topology or configuration change. The Rapid Spanning Tree algorithm
provides for a more rapid recovery of connectivity following the failure of a
bridge, bridge port, or a LAN.
For information about RSTP see the Rapid Mode Spanning Tree Types section,
Switch chapter in the Rapier Switch Software Reference.
Switch chapter in the Rapier Switch Software Reference.
Spanning Tree and Rapid Spanning Tree Port States
If STP is running in STANDARD mode, then each port can be in one of five
Spanning Tree states, and one of two switch states. If STP is running in RAPID
mode, then each port can be in one of four states. The state of a switch port is
taken into account by STP. To be involved in STP negotiations, STP must be
enabled on the switch, the port must be enabled on the switch, and enabled for
the STP it belongs to.
Spanning Tree states, and one of two switch states. If STP is running in RAPID
mode, then each port can be in one of four states. The state of a switch port is
taken into account by STP. To be involved in STP negotiations, STP must be
enabled on the switch, the port must be enabled on the switch, and enabled for
the STP it belongs to.
The Spanning Tree states (see Table 16) affect the behaviour of ports whose
switch state is enabled.
switch state is enabled.
Table 16: Spanning tree port states .
State
Meaning
DISABLED
STP operations are disabled on the port. The port can still
switch if its switch state is enabled.
switch if its switch state is enabled.
LISTENING
The port is enabled for receiving frames only.
LEARNING
The port is enabled for receiving frames only, and the
Learning Process can add new source address information
to the Forwarding Database.
Learning Process can add new source address information
to the Forwarding Database.
FORWARDING
The normal state for a switch port. The Forwarding Process
and the Spanning Tree entity are enabled for transmit and
receive operations on the port.
and the Spanning Tree entity are enabled for transmit and
receive operations on the port.
BLOCKING
The Spanning Tree entity has disabled the Forwarding
process for transmit and receive operations on the port, but
the Spanning Tree entity itself remains enabled for transmit
and receive operations on the port.
process for transmit and receive operations on the port, but
the Spanning Tree entity itself remains enabled for transmit
and receive operations on the port.
Table 17: Rapid Spanning Tree port states .
State
Meaning
DISABLED
STP operations are disabled on the port.
DISCARDING
The port does not participate in frame relay. The forwarding
process discards received frames and does not submit
forwarded frames for transmission.
process discards received frames and does not submit
forwarded frames for transmission.
LEARNING
The port is enabled for receiving frames only, and the
Learning Process can add new source address information
to the Forwarding Database. The port does not forward any
frames.
Learning Process can add new source address information
to the Forwarding Database. The port does not forward any
frames.
FORWARDING
The normal state for a switch port. The Forwarding Process
and the Spanning Tree entity are enabled for transmit and
receive operations on the port.
and the Spanning Tree entity are enabled for transmit and
receive operations on the port.