Juniper IGP - CONFIGURATION GUIDE V11.1.X, Configuration Manual

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For details about configuring graceful restart, see “Configuring Graceful Restart” on
page 379
.
IS-IS for IPv6
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.
Platform Considerations
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.
■
See ERX Module Guide, Appendix A, Module Protocol Support for information about
the modules that support IS-IS.
For information about modules that support IS-IS on the E120 and E320 Broadband
Services Routers:
■
See E120 and E320 Module Guide, Table 1, Modules and IOAs for detailed module
specifications.
■
See E120 and E320 Module Guide, Appendix A, IOA Protocol Support for information
about the modules that support IS-IS.
References
For more information about the IS-IS protocol, consult the following resources:
■
JUNOSe Release Notes , Appendix A , System Maximums —See the Release Notes
corresponding to your software release for information about maximum values.
■
ISO International Standard 8473-1:1993—Information technology – Protocol for
providing the connectionless-mode network service
Platform Considerations
■ 339
Chapter 6: Configuring IS-IS