ProLiant BL p-Class GbE2 Interconnect Switch Application Guide

Spanning Tree Protocol 64
Pre-emption
You can configure the Master interface to resume the active state whenever it becomes available. With Hot Links
pre-emption enabled (/cfg/l2/hotlink/trigger x/preempt ena), the Master interface transitions to the
active state immediately upon recovery. The Backup interface immediately transitions to the standby state. If
Forward Delay is enabled, the transition occurs when an interface has maintained link stability for the duration of
the Forward Delay period.
FDB Update
Use the FDB update option to notify other devices on the network about updates to the Forwarding Database
(FDB). When you enable FDB update (/cfg/l2/hotlinks/trigger x/sndfdb ena), the GbE2 sends
multicasts of addresses in the forwarding database (FDB) over the active interface, so that other devices on the
network can learn the new path.
The Hot Links FBD update option uses the station update rate (/cfg/l2/update) to determine the rate at which
to send FDB packets.
Configuration Guidelines
The following configuration guidelines apply to Hot links:
• Only external ports and inter-switch links can be configured as Hot Links.
• Ports that are configured as Hot Link interfaces must have STP disabled.
• When Hot Links is turned on, MSTP must be disabled.
• When Hot Links is turned on, UplinkFast (/cfg/l2/upfast) must be turned off (/cfg/l2/mrst/off).
• A port that is a member of the Master interface cannot be a member of the Backup interface. A port that is
a member of one Hot Links trigger cannot be a member of another Hot Links trigger.
• An individual port that is configured as a Hot Link interface cannot be a member of a trunk.
• An LACP trunk cannot be configured as a Hot Link interface.
Configuring Hot Links
Use the following CLI commands to configure Hot Links:
>> # /cfg/l2/hotlink/trigger 1 ena
>> Trigger 1# master/port 20
>> Master# ..
>> Trigger 1# backup/port 21
>> Backup# ..
>> Trigger 1# ..
>> Hot Links# on