Extreme Networks ExtremeWare XOS Guide Manual page 310

Spanning Tree Protocol
Table 45: RSTP link types
Port Link Type Description
Auto Specifies the switch to automatically determine the port link type. An auto link behaves like a
point-to-point link if the link is in full-duplex mode or if link aggregation is enabled on the
port. Otherwise, the link behaves like a broadcast link used for 802.1w configurations.
Edge Specifies a port that does not have a bridge attached. An edge port is placed and held in the
STP forwarding state unless a BPDU is received by the port.
Broadcast Specifies a port attached to a LAN segment with more than two bridges. A port with a
broadcast link type cannot participate in rapid reconfiguration. By default, all ports are
broadcast links.
Point-to-point Specifies a port attached to a LAN segment with only two bridges. A port with port-to-port link
type can participate in rapid reconfiguration. Used for 802.1w configurations.
Configuring Link Types. By default, all ports are broadcast links. To configure the ports in an STPD, use
the following command:
configure stpd <stpd_name> ports link-type [auto | broadcast | edge | point-to-point]
<port_list>
Where the following is true:
—Configures the ports as auto links. If the link is in full-duplex mode or if link aggregation is
●
auto
enabled on the port, an auto link behaves like a point-to-point link.
—Configures the ports as edge ports.
●
edge
—Configures the ports for an RSTP environment.
●
point-to-point
To change the existing configuration of a port in an STPD, and return the port to factory defaults, use
the following command:
unconfigure stpd <stpd_name> ports link-type <port_list>
To display detailed information about the ports in an STPD, use the following command:
show stpd <stpd_name> ports {[detail | <port_list> {detail}]}
RSTP Timers
For RSTP to rapidly recover network connectivity, RSTP requires timer expiration. RSTP derives many
of the timer values from the existing configured STP timers to meet its rapid recovery requirements
rather than relying on additional timer configurations.
and Table 47 describes the timers that are derived from other timers and not user-configurable.
Table 46: User-configurable timers
Timer
Hello
Forward delay
ExtremeWare XOS 11.1 Concepts Guide
Description
The root bridge uses the hello timer to send out configuration BPDUs through all of
its forwarding ports at a predetermined, regular time interval. The default value is 2
seconds. The range is 1 to 10 seconds.
A port moving from the blocking state to the forwarding state uses the forward delay
timer to transition through the listening and learning states. In RSTP, this timer
complements the rapid configuration behavior. If none of the rapid rules are in
effect, the port uses legacy STP rules to move to the forwarding state. The default
is 15 seconds. The range is 4 to 30 seconds.
Table 46 describes the user-configurable timers,
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