LevelOne GSW-1676, Руководство пользователя

Страница: 100 / 150

C
ONFIGURING THE
S
WITCH
6-52
This delay is required because every device must receive information
about topology changes before it starts to forward frames. In addition,
each port needs time to listen for conflicting information that would
make it return to a discarding state; otherwise, temporary data loops
might result.
(Default: 15;
Minimum: The higher of 4 or [(Max. Message Age / 2) + 1]
Maximum: 30)
• Force Version – RSTP supports connections to either RSTP or STP
nodes by monitoring the incoming protocol messages and dynamically
adjusting the type of protocol messages the RSTP node transmits, as
described below:
- Normal (RSTP Mode) – If RSTP is using 802.1D BPDUs on a
port and receives an RSTP BPDU after the migration delay
expires, RSTP restarts the migration delay timer and begins using
RSTP BPDUs on that port.
- Compatible (STP Mode) – If the switch receives an 802.1D
BPDU (i.e., STP BPDU) after a port’s migration delay timer
expires, the switch assumes it is connected to an 802.1D bridge
and starts using only 802.1D BPDUs.
RSTP Port Configuration
Field Attributes
• Port - The number of a port or all aggregations (i.e., static trunks). Note
that the spanning tree attributes for dynamically configured LACP
trunks cannot be modified.
• Enabled - Enables/disables RSTP on an interface. (Default: Disabled).
• Edge Port (Fast Forwarding) - You can enable this option if an interface
is attached to a LAN segment that is at the end of a bridged LAN or to
an end node. Since end nodes cannot cause forwarding loops, they can
pass directly through to the spanning tree forwarding state. Specifying
Edge Ports provides quicker convergence for devices such as
workstations or servers, retains the current forwarding database to
reduce the amount of frame flooding required to rebuild address tables