Graceful Restart; Features - Juniper IGP - CONFIGURATION GUIDE V11.1.X Configuration Manual

Table Maps
E Series routers support the use of table maps to filter and manipulate the attributes
of an IS-IS route before the route is installed in the routing table. Issuing the table-map
command (in Router Configuration mode) applies a specified route map as a policy
filter on the route before the route is installed in the routing table.
For IS-IS routes, the route map you apply by using the table-map command contains
one or more set commands that can modify the following route attributes:
The router applies the specified route map to all routes currently and subsequently
installed in the routing table. If any previously redistributed routes are changed as a
result of applying the route map, the router redistributes these routes again with the
changes caused by the route map.
For details about configuring and using route maps, see JUNOSe IP Services
Configuration Guide.

Graceful Restart

E Series routers support IS-IS graceful restart as defined in RFC 3847 Restart
Signaling for Intermediate System to Intermediate System (IS-IS) (July 2004). Graceful
restart is also known as nonstop forwarding (NSF). When graceful restart is enabled
on an IS-IS router, it allows the router to restart with minimal routing disruption to
the network.

Features

When a router running in an IS-IS domain restarts, it typically causes routers in that
domain to reset their adjacencies, thus generating unnecessary LSP flooding and
shortest-path-first (SPF) calculations throughout the domain. Enabling graceful restart
Although the router accepts IS-IS routes with multiple route tags and propagates
these routes in LSPs, it uses only the first route tag assigned to a route to
determine routing policy.
64-bit (8-octet) route tags
Although the router accepts IS-IS routes with 64-bit route tags and propagates
these routes in LSPs, it does not use 64-bit route tags to determine routing policy.
Mathematical (ordered) set operations on multiple route tags
distance
level
metric
metric type
Chapter 6: Configuring IS-IS
origin
preference
route type
tag
Overview
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