Extreme Networks ExtremeWare XOS Command Reference Manual page 1196

ExtremeWare XOS 11.5 supports only the Summit X450 family of switches and the BlackDiamond 8800 series switch.
STP Commands
Auto 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, an auto link behaves like a broadcast link. If a non-
STP switch exists between several switches operating in 802.1w mode with auto links, the non-STP
switch may negotiate full-duplex even though the broadcast domain extends over several STP devices.
Edge Link Type. RSTP does not send any BPDUs from an edge port nor does it generate topology
change events when an edge port changes its state.
If you configure a port to be an edge port, the port immediately enters the forwarding state. Edge ports
remain in the forwarding state unless the port receives a BPDU. In that case, edge ports enter the
blocking state. The edge port remains in the blocking state until it stops receiving BPDUs and the
message age timer expires.
Edge Safeguard. Loop prevention and detection on an edge port configured for RSTP or MSTP is called
"edge safeguard." You configure edge safeguard on RSTP or MSTP edge ports to prevent accidental or
deliberate misconfigurations (loops) resulting from connecting two edge ports together or by connecting
a hub or other non-STP switch to an edge port. Edge safeguard also limits the impact of broadcast
storms that might occur on edge ports.
An edge port configured with edge safeguard immediately enters the forwarding state and transmits
BPDUs. This advanced loop prevention mechanism improves network resiliency but does not interfere
with the rapid convergence of edge ports.
To enable configure a port as an edge port and enable edge safeguard on that port, use the
configure
command and specify
stpd <stpd_name> ports link-type edge <port_list> edge-safeguard
.
enable
To disable edge safeguard on the edge port, use the
configure stpd <stpd_name> ports link-type
command and specify .
edge <port_list> edge-safeguard disable
Two other commands are also available to enable and disable edge safeguard:
configure stpd ports edge-safeguard enable
configure stpd ports edge-safeguard disable
Example
The following command configures slot 2, ports 1 through 4 to be point-to-point links in STPD s1:
configure stpd s1 ports link-type point-to-point 2:1-2:4
The following command enables edge safeguard on the RSTP edge port on slot 2, port 3 in STPD s1
configured for RSTP:
configure stpd s1 ports link-type edge 2:3 edge-safeguard enable
History
This command was available in ExtremeWare XOS 10.1.
Platform Availability
This command is available on all platforms.
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ExtremeWare XOS 11.5 Command Reference Guide