Alcatel-Lucent 7750 SR Manual page 669

mst-revision
Syntax mst-revision revision-number
Context config>service>vpls>stp
Description This command defines the MST configuration revision number. Two bridges are considered as a part
of the same MST region as soon as their configuration of MST-region name, MST-revision and
VLAN-to-instance assignment is identical.
The no form of this command returns MST configuration revision to its default value.
Default
0
Parameters
revision-number — Specifies the MSTP region revision number to define the MSTP region.
path-cost
Syntax path-cost sap-path-cost
no path-cost
Context config>service>vpls>sap>stp
config>service>vpls>spoke-sdp>stp
Description
This command configures the Spanning Tree Protocol (STP) path cost for the SAP or spoke SDP.
The path cost is used by STP to calculate the path cost to the root bridge. The path cost in BPDUs
received on the root port is incremented with the configured path cost for that SAP or spoke SDP.
When BPDUs are sent out other egress SAPs or spoke SDPs, the newly calculated root path cost is
used. These are the values used for CIST when running MSTP.
STP suggests that the path cost is defined as a function of the link bandwidth. Since SAPs and spoke
SDPs are controlled by complex queuing dynamics, in the 7750 SR the STP path cost is a purely
static configuration.
The no form of this command returns the path cost to the default value.
path-cost — The path cost for the SAP or spoke SDP.
port-num
Syntax [no] port-num virtual-port-number
Context config>service>vpls>sap>stp
config>service>vpls>spoke-sdp>stp
Description This command configures the virtual port number which uniquely identifies a SAP within
configuration bridge protocol data units (BPDUs). The internal representation of a SAP is unique to a
7750 SR OS Services Guide
Values
0 — 65535
Values
1 — 200000000 (1 is the lowest cost)
Default
10
Virtual Private LAN Services
Page 669