Alcatel-Lucent 7750 SR Manual page 666

Virtual Private LAN Services
max-age
Syntax max-age seconds
no max-age
Context config>service>vpls>stp
Description This command indicates how many hops a BPDU can traverse the network starting from the root
bridge. The message age field in a BPDU transmitted by the root bridge is initialized to 0. Each other
bridge will take the message_age value from BPDUs received on their root port and increment this
value by 1. The message_age thus reflects the distance from the root bridge. BPDUs with a message
age exceeding max-age are ignored.
STP uses the max-age value configured in the root bridge. This value is propagated to the other
bridges via the BPDUs.
The no form of this command returns the max ageto the default value.
Default 20 seconds
Parameters
seconds — The max info age for the STP instance in seconds. Allowed values are integers in the
mode
Syntax mode {rstp | comp-dot1w | dot1w | mstp | pmstp}
no mode
Context config>service>vpls>stp
Description
This command specifies the version of Spanning Tree Protocol the bridge is currently running.
See section
The no form of this command returns the STP variant to the default.
Default
rstp
Parameters rstp — Corresponds to the Rapid Spanning Tree Protocol specified in IEEE 802.1D/D4-2003.
dot1w — Corresponds to the mode where the Rapid Spanning Tree is backward compatible with
compdot1w — Corresponds to the Rapid Spanning Tree Protocol fully conformant to IEEE 802.1w.
mstp — Sets MSTP as the STP mode of operation. Corresponds to the Multiple Spanning Tree
pmstp — The PMSTP mode is only supported in VPLS services where the mVPLS flag is
Page 666
range 6 to 40.
Spanning Tree Operating Modes on page 435
IEEE 802.1w.
Protocol specified in 802.1Q REV/D5.0-09/2005
configured.
for details on these modes.
7750 SR OS Services Guide