Is-Is For Ipv6; Platform Considerations; Table 15: Is-Is Graceful Restart Timers - Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - IP-IPV6-IGP CONFIGURATION GUIDE 2010-10-31 Configuration Manual

JunosE 11.3.x IP, IPv6, and IGP Configuration Guide

IS-IS for IPv6

Platform Considerations

330
Graceful restart uses a set of configurable timers to support the restart mechanism.
Table 15 on page 330 briefly describes these timers and lists the associated commands
that you can use to configure the timer values on the router.

Table 15: IS-IS Graceful Restart Timers

Timer Description
Interface Sets the maximum time (in seconds) that the router
wait waits for all interfaces with IS-IS adjacencies to come
up before completing the restart process
T1 Sets the time interval (in seconds) between restart
requests sent by the router, and the number of times
that the router resends unacknowledged restart
requests
T2 Sets the maximum time (in seconds) that the router
waits for the LSP database to synchronize
T3 Sets the maximum time (in seconds) that the restarting
router waits before setting the overload bit to indicate
that graceful restart has failed
For details about configuring graceful restart, see "Configuring Graceful Restart" on
page 369 .
E Series routers support IPv6 routing for IS-IS. The IPv6 Reachability TLV propagates
reachability information by flooding and is used in SPF calculations. The IPv6 Interface
TLV is used for next hop calculation and is exchanged by means of IS-IS hello packets.
A single SPF calculation computes both IPv6 and IPv4 routing tables.
IS-IS routers learn about their neighbors' support for IPv6 through the ISO network layer
IPv6 protocol identifier, NLPID 142. The NLPID is contained in the NLPID TLV and is sent
out in IS-IS hello packets when IS-IS IPv6 routing is enabled on an interface. A mismatch
in support prevents an IS-IS adjacency from being established, because both neighbors
must run the same protocols.
IPv6 aggregation, leaking, redistribution, export policies and import policies are supported
similarly as for IP, but must be configured within the IS-IS IPv6 address family.
Graceful restart is supported for IS-IS IPv6 traffic depending on the availability of IPv6
high availability. It does not affect IP traffic.
For information about modules that support IS-IS on the ERX7xx models, ERX14xx models,
and the ERX310 Broadband Services Router:
See ERX Module Guide, Table 1, Module Combinations for detailed module specifications.
Associated Command
"nsf interface wait" on
page 371
"nsf t1" on page 371
"nsf t2" on page 372
"nsf t3" on page 372
Copyright © 2010, Juniper Networks, Inc.