Virtual Private LAN Services
Page 376 7210 SAS-X, R6 OS Services Guide
VPLS STP Commands
stp
Syntax stp
Context config>service>vpls
config>service>vpls>sap
config>template>vpls-template
Description This command enables the context to configure the Spanning Tree Protocol (STP) parameters.
Alcatel-Lucent’s STP is simply the Spanning Tree Protocol (STP) with a few modifications to better
suit the operational characteristics of VPLS services. The most evident change is to the root bridge
election. Since the core network operating between Alcatel-Lucent’s service routers should not be
blocked, the root path is calculated from the core perspective.
auto-edge
Syntax auto-edge
no auto-edge
Context config>service>vpls>sap>stp
config>service>vpls>spoke-sdp>stp
Description This command configures automatic detection of the edge port characteristics of the SAP.
The no form of this command returns the auto-detection setting to the default value.
Default auto-edge
edge-port
Syntax [no] edge-port
Context config>service>vpls>sap>stp
config>service>vpls>spoke-sdp>stp
Description This command configures the SAP as an edge or non-edge port. If auto-edge is enabled for the SAP,
this value will be used only as the initial value.
RSTP, however, can detect that the actual situation is different from what edge-port may indicate.
Initially, the value of the SAP parameter is set to edge-port. This value will change if:
• A BPDU is received on that port. This means that after all there is another bridge connected to
this port. Then the edge-port becomes disabled.
• If auto-edge is configured and no BPDU is received within a certain period of time, RSTP con-
cludes that it is on an edge and enables the edge-port.
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