Setting The Keepalive Hold Timer For Identifying The Cause Of Ipl Down Events; Configuring Dr System Auto-Recovery - H3C S7500X Series Configuration Manual

Setting the keepalive hold timer for identifying the
cause of IPL down events
Overview
The keepalive hold timer starts when the IPL goes down. The keepalive hold timer specifies the
amount of time that the device uses to identify the cause of an IPL down event.
•
If the device receives keepalive packets from the DR peer before the timer expires, the IPL is
down because the IPL fails.
•
If the device does not receive keepalive packets from the DR peer before the timer expires, the
IPL is down because the peer DR device fails.
Configuration restrictions and guidelines
For the DR member device to correctly determine the cause of an IPL down event, make sure the
keepalive hold timer is longer than the keepalive interval and is shorter than the keepalive timeout
timer.
Configuration procedure
To set the keepalive hold timer:
Step
1. Enter system view.
2. Set the keepalive hold timer.

Configuring DR system auto-recovery

Overview
If only one DR member device recovers after the entire DR system reboots, auto-recovery enables
that member device to take over the primary role when the reload delay timer expires. Then, the
member device can forward traffic through its DR interfaces.
If auto-recovery is disabled, that DR member device will be stuck in the None role with all its DR
interfaces being down after it recovers.
Configuration restrictions and guidelines
If both DR member devices recover after the entire DR system reboots, active-active situation might
occur if both IPL and keepalive links were down when the reload delay timer expires. If this rare
situation occurs, examine the IPL and keepalive links and restore them.
Configuration procedure
To configure DR system auto-recovery:
Step
1. Enter system view.
2. Configure DR system
auto-recovery.
Command
system-view
drni keepalive hold-time value
Command
system-view
drni auto-recovery reload-delay
delay-value
14
Remarks
N/A
By default, the keepalive hold
timer is 3 seconds.
Remarks
N/A
By default, DR system
auto-recovery is not configured.
The reload delay timer is not set.