Specifications

202 ExtremeWare XOS 11.0 Concepts Guide
Spanning Tree Protocol
• Protected VLAN named v2
• v2 contains ports 3:1-3:4
Since v1 contains ports 3:1-3:2, v2 is aware only of the STP changes for ports 3:1 and 3:2, respectively.
Ports 3:3 and 3:4 are not part of the STPD, which is why v2 is not aware of any STP changes for those
ports.
In addition, enabling autobind on a protected VLAN causes ports to be automatically added or
removed as the carrier VLAN changes.
To remove ports, use the following command:
configure stpd <stpd_name> delete vlan <vlan_name> ports [all | <port_list>]
If you manually delete a port from the STPD on a VLAN that has been added by autobind,
ExtremeWare XOS records the deletion so that the port does not get automatically added to the STPD
after a system restart.
To learn more about the member VLANs, see “Member VLANs” on page 197. For more detailed
information about these CLI commands, see the ExtremeWare XOS Command Reference Guide.
Rapid Root Failover
ExtremeWare XOS supports rapid root failover for faster STP failover recovery times in STP 802.1D
mode. If the active root port link goes down, ExtremeWare XOS recalculates STP and elects a new root
port. The rapid root failover feature allows the new root port to immediately begin forwarding,
skipping the standard listening and learning phases. Rapid root failover occurs only when the link goes
down and not when there is any other root port failure, such as missing BPDUs.
The default setting for this feature is disabled. To enable rapid root failover, use the following
command:
enable stpd <stpd_name> rapid-root-failover
To display the configuration, use the following command:
show stpd {<stpd_name> | detail}
STP and Hitless Failover
ExtremeWare XOS 11.0 introduces support of hitless failover. When you install two Management Switch
Fabric Module (MSM) modules in a BlackDiamond chassis, one MSM assumes the role of primary and
the other MSM assumes the role of backup. The primary executes the switch’s management functions,
and the backup acts in a standby role. Hitless failover transfers switch management control from the
primary to the backup and maintains the state of STP. STP supports hitless failover, and it is enabled by
default.
NOTE
You must run ExtremeWare XOS 11.0 or later for STP support of hitless failover. If you have an earlier
version of ExtremeWare XOS, STP does not support hitless failover.