Guidelines For Setting The Ip Interface Priority; Setting The Ip Interface Priority - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - SERVICE AVAILABILITY CONFIGURATION GUIDE 2010-10-08 Configuration Manual

JunosE 11.3.x Service Availability Configuration Guide

Guidelines for Setting the IP Interface Priority

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Setting the IP Interface Priority

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During the warm restart after an SRP switchover, IP and IPv6 interfaces are replayed
from NVS and from mirrored storage. High-priority IP and IPv6 interfaces are replayed
first, followed by static routes, and then by low-priority IP and IPv6 interfaces. This scheme
enables static routes that are dependent on high-priority interfaces to be resolved and
routing protocols to exchange information with peers over high-priority interfaces before
the low-priority interfaces are replayed.
You can designate an IP or IPv6 interface as high priority either implicitly or explicitly:
Implicit designation—Configure an IGP or PIM protocol on the interface.
Explicit designation—Issue the ip initial-sequence-preference 1 command on the IP
subinterface, or the ipv6 initial-sequence-preference 1 command on the IPv6
subinterface.
An IP or IPv6 interface can be designated as high priority by more than one protocol, the
CLI command, or both. You can change an IP or IPv6 interface from high priority to low
priority only by one of the following methods:
Delete the IP or IPv6 interface.
Remove all high-priority configuration from the IP or IPv6 interface, then reload the
router.
Setting the IP Interface Priority on page 54
ip initial-sequence-preference
ipv6 initial-sequence-preference
Use the ip initial-sequence-preference command to set the preference value on an IP
or IPv6 interface at the subinterface level. To configure the interface as high-priority,
specify the value of the initial sequence preference as 1. To configure the interface as
low-priority, specify the value as 0.
To set the priority for the IPv4 or IPv6 interface, you can do one of the following:
From Subinterface Configuration mode, explicitly configure the IPv4 interface as
high-priority:
host1(config-subif)#ip initial-sequence-preference 1
From Subinterface Configuration mode, explicitly configure the IPv6 interface as
low-priority:
host1(config-subif)#ipv6 initial-sequence-preference 0
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