Minimizing Network Disruption Using Split Detection; Split Detection Behavior In A Virtual Chassis; How Split Detection Works In A Virtual Chassis - Juniper EX9200 Features Manual

CHAPTER 8
Minimizing Network Disruption Using Split
Detection

Split Detection Behavior in a Virtual Chassis

How Split Detection Works in a Virtual Chassis

Copyright © 2017, Juniper Networks, Inc.
Split Detection Behavior in a Virtual Chassis on page 63
Disabling Split Detection in a Virtual Chassis Configuration on page 68
If there is a disruption to a Virtual Chassis configuration for MX Series 3D Universal Edge
Routers or EX9200 Switches due to the failure of a member router or switch or one or
more Virtual Chassis port interfaces, the resulting connectivity loss can cause a split in
the Virtual Chassis configuration. Split detection identifies the split and can minimize
further network disruption.
This topic covers:
How Split Detection Works in a Virtual Chassis on page 63
Effect of Split Detection on Virtual Chassis Failure Scenarios on page 64
Split detection is enabled by default in an EX9200 or MX Series Virtual Chassis. Optionally,
you can disable split detection by including the
hierarchy level. Disabling split detection can be useful in certain Virtual
virtual-chassis]
Chassis configurations.
For example, if the backup router or switch fails in a two-member Virtual Chassis
configuration and split detection is enabled (the default behavior), the master router or
switch takes a line-card role, and the line cards (FPCs) that do not host Virtual Chassis
ports go offline. This state effectively halts routing and disables the Virtual Chassis
configuration. By contrast, if the backup router or switch fails in a two-member Virtual
Chassis configuration and split detection is disabled, the master router or switch retains
mastership and maintains all of the Virtual Chassis ports, effectively resulting in a
single-member Virtual Chassis consisting of only the master router or switch.
BEST PRACTICE:
two-member Virtual Chassis configuration if you think the backup router or
no-split-detection
We recommend that you disable split detection for a
statement at the [edit
63