Juniper EX9200 Features Manual page 147

Related
Documentation
Copyright © 2017, Juniper Networks, Inc.
Chapter 13: Understanding How the VRRP Router Failover Mechanism Prevents Network Failures
To avoid such a situation and to enable faster convergence time, in Junos OS Release
12.2 and later, you can configure a fast advertisement interval value that specifies the
number of fast advertisements that can be missed by a backup router before it starts
transitioning to the master state.
To configure the fast advertisement interval, include the
global-advertisements-threshold
Configure inheritance of VRRP groups—Junos OS enables you to configure VRRP
groups on the various subnets of a virtual LAN (VLAN) to inherit the state and
configuration of one of the groups, which is known as the active VRRP group. When
the statement is included in the configuration, only the active VRRP
vrrp-inherit-from
group, from which the other VRRP groups inherit the state, sends out frequent VRRP
advertisements and processes incoming VRRP advertisements. Use inherit groups for
scaled configurations. For example, if you have 1000 VRRP groups with an
advertisement interval of 100 ms, then use inherit groups.
To configure inheritance for a VRRP group, include the
the
[edit interfaces interface-name unit logical-unit-number family inet address address
vrrp-group group-id] hierarchy level.
Disable duplication address detection for IPv6 interfaces—Starting with Junos OS
Release 15.1, duplicate address detection is a feature of the Neighbor Discovery Protocol
for IPv6. Detection address detection is enabled by default and determines whether
an address is already in use by another node. When detection address detection is
enabled, convergence time is high after an IPv6 interface that has been configured for
VRRP tracking comes up. To disable duplicate address detection, include the
ipv6-duplicate-addr-translation transmits 0
hierarchy level. To disable duplicate address detection only for a
internet-options]
specific interface, include the
interface-name unit logical-unit-number family inet6]
NOTE:
Inheritance of VRRP groups is supported with all types of interfaces. Other
measures to reduce convergence time, such as VRRP distribution, disabling
skew timer, and reducing advertisement threshold.
Compared to other routers, the convergence time and the traffic restoration
time are less for MX Series routers with MPCs.
Reduction in convergence time is applicable for all types of configurations
at the physical interface but the convergence time might not be less than
1 second for all the configurations. The convergence time depends on the
number of groups that are transitioning from the backup to the master
state and the interval at which these groups are transitioning.
Configuring Inheritance for a VRRP Group on page 145
Configuring VRRP to Improve Convergence Time on page 149
delegate-processing on page 266
statement at the [edit protocols vrrp]
vrrp-inherit-from
statement at the
statement at the
dad-disable
hierarchy level.
hierarchy level.
statement at
[edit system
[edit interfaces
127