Avaya G250 Administration page 234

Configuring advanced switching
Whereas the STA passively waited for the network to converge before turning a port into the
forwarding state, RSTP actively confirms that a port can safely transition to forwarding without
relying on any specific, programmed timer configuration.
RSTP provides a means of fast network convergence after a topology change. It does this by
assigning different treatments to different port types. The port types and the treatment they
receive follow:
Edge ports — Setting a port to edge-port admin state indicates that this port is connected
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directly to end stations that cannot create bridging loops in the network. These ports
transition quickly to forwarding state. However, if BPDUs are received on an Edge port, it's
operational state will be changed to non-edge-port and bridging loops will be avoided by
the RSTP algorithm. The default admin state of 10/100 M ports is edge-port.
Use the set port edge admin state command, followed by the module and port
number, or a range of port numbers, to specify whether or not a port is considered an edge
port. For example, the following command specifies that ports 5 to 13 on module 4 are edge
ports:
G350-001(super)# set port edge admin state 4/5-13 edge-port
The following command specifies that port 6 on module 6 is not an edge port:
G350-001(super)# set port edge admin state 6/6 non-edge-port
Use the show port edge state command, followed by the module and port number, to
display the edge state of the specified port. Use this command without specifying a module
number or port to display the edge state of all ports.
You must manually configure uplink and backbone ports to be non-edge ports, using the
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set port edge admin state command.
Point-to-point Link ports — This port type applies only to ports interconnecting RSTP
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compliant switches and is used to define whether the devices are interconnected using
shared Ethernet segment or point-to-point Ethernet link. RSTP convergence may be faster
when switches are connected using point-to-point links. The default setting for all ports –
automatic detection of point-to-point link – is sufficient for most networks.
Use the set port point-to-point admin status command, followed by the
module and port number or a range of port numbers, and an admin status parameter, to
specify the port's connection type. Admin status parameters are:
- force-true — treats the port as if it is connected point-to-point
- force-false — treats the port as if it is connected to shared media
- auto — tries to automatically detect the port's connection type
234 Administration for the Avaya G250 and Avaya G350 Media Gateways