Disabling Split Detection In A Virtual Chassis Configuration - Juniper EX9200 Features Manual

Virtual Chassis Feature Guide for EX9200 Switches

Disabling Split Detection in a Virtual Chassis Configuration

Related
Documentation
68
If there is a disruption to a Virtual Chassis due to failure of a member device or one or
more Virtual Chassis port links, the resulting connectivity loss can cause a split in the
Virtual Chassis configuration. Split detection, which is enabled by default in an MX Series
and EX9200 Virtual Chassis, identifies the split and minimizes further network disruption.
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 device fails in a two-member Virtual Chassis configuration
and split detection is enabled (the default behavior), the master device takes a
role, and the line cards (FPCs) that do not host Virtual Chassis ports go offline. This state
effectively isolates the master router or switch and removes it from the Virtual Chassis
until connectivity is restored. As a result, routing or switching is halted and the Virtual
Chassis configuration is disabled. 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
device.
BEST PRACTICE:
two-member Virtual Chassis configuration if you think the backup router or
switch is more likely to fail than the Virtual Chassis port interfaces to the
backup router or switch. Configuring redundant Virtual Chassis ports on
different line cards in each member router or switch reduces the likelihood
that all Virtual Chassis port interfaces to the backup router or switch can fail.
To disable split detection:
Specify that you want to disable the default detection of splits in the Virtual Chassis.
1.
[edit virtual-chassis]
user@host# set no-split-detection
Commit the configuration.
2.
Disabling split detection causes different results for different types of Virtual Chassis
failures. For information, see
Split Detection Behavior in a Virtual Chassis on page 63
Global Roles and Local Roles in a Virtual Chassis on page 59
Switchover Behavior in an MX Series Virtual Chassis
Virtual Chassis Components Overview
no-split-detection
We recommend that you disable split detection for a
"Split Detection Behavior in a Virtual Chassis" on page
statement at the
line-card
Copyright © 2017, Juniper Networks, Inc.
[edit
63.