Virtual Private LAN Services
7750 SR OS Services Guide 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.
Values 0 — 65535
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.
Values 1 — 200000000 (1 is the lowest cost)
Default 10
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
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