Determining Gres Readiness In A Virtual Chassis Configuration; The Virtual Chassis Master Router Or Switch - Juniper EX9200 Features Manual

Virtual Chassis Feature Guide for EX9200 Switches

Determining GRES Readiness in a Virtual Chassis Configuration

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Depending on the configuration, a variable amount of time is required before a router or
switch is ready to perform a graceful Routing Engine switchover (GRES). Attempting a
GRES operation before the device is ready can cause system errors and unexpected
behavior.
To determine whether the member routers or switches in a Virtual Chassis configuration
are ready for a GRES operation from a database synchronization perspective, you can
issue the request virtual-chassis routing-engine master switch check
Virtual Chassis master router or switch (VC-Mm) before you initiate the GRES operation.
Using the
request virtual-chassis routing-engine master switch check
you initiate the GRES operation ensures that the subscriber management and kernel
databases on both member routers or switches are synchronized and ready for the GRES
operation.
To determine whether the member routers or switches are ready for GRES from a
database synchronization perspective:
Issue the
request virtual-chassis routing-engine master switch check
1.
the Virtual Chassis master router or switch (VC-Mm).
{master:member0-re0}
request virtual-chassis routing-engine master switch
user@host>
The
request virtual-chassis routing-engine master switch check
various system and database components on the member routers or switches to
determine whether they are ready for GRES, but does not initiate the global GRES
operation itself. The readiness check includes ensuring that a system timer, which
expires after 300 seconds, completes before the global GRES operation begins.
Review the results of the
2.
command to determine whether the member routers or switches are ready for a GRES
operation from a database synchronization perspective.
If the member routers or switches are ready for GRES, the
routing-engine master switch check
readiness. For example:
{master:member0-re0}
user@host> request virtual-chassis routing-engine master switch
Switchover Ready
If the member routers or switches are not ready for GRES, the
routing-engine master switch check
readiness of the system. For example:
{master:member0-re0}
user@host> request virtual-chassis routing-engine master switch
request virtual-chassis routing-engine master switch check
command displays a message confirming GRES
command displays information about the
command from the
command before
command from
check
command checks
request virtual-chassis
check
request virtual-chassis
check
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