family (Protocols IS-IS)
Syntax
family inet {
shortcuts {
multicast-rpf-routes;
}
}
family inet-mpls {
shortcuts;
}
family inet6 {
shortcuts;
}
family inet6-mpls {
shortcuts;
}
Hierarchy Level
[edit logical-systems logical-system-name protocols isis traffic-engineering], [edit logical-systems logical-system-name routing-instances routing-instance-name protocols isis traffic-engineering], [edit protocols isis traffic-engineering], [edit routing-instances routing-instance-name protocols isis traffic-engineering]
Description
Configure the address family for traffic engineering IS-IS interior gateway protocol (IGP) shortcuts.
Options
| inet | Configure the IPv4 address family. |
||
| inet-mpls | Configure the IPv4 MPLS address family. |
||
| inet6 | Configure the IPv6 address family. |
||
| inet6-mpls | Configure the IPv6 address family. |
||
| shortcuts | Configure IS-IS to use MPLS label-switched paths (LSPs) as next hops if possible when installing routing information into the inet.3 or inet6.3 routing table. Internal gateway protocol (IGP) shortcuts allow the IGP to install prefixes in inet.3 or inet6.3. It is only necessary to enable IGP shortcuts on the ingress router because that is the router performing the shortest-path-first (SPF) calculations. It is important to understand how IGP shortcuts affect the protocol
and routing table relationship. The IGP performs SPF calculations
to subnets downstream of LSP egress points, but the results of these
calculations are entered into the inet.3 table only. At the same time,
the IGP performs its traditional SPF calculations and enters the results
of these calculations into the inet.0 table. The result is that although
the IGP is making entries into the inet.3 table, BGP is still the
only protocol with visibility into that table for the purposes of
route resolution. Therefore, forwarding to AS-internal destinations
still uses the inet.0 IGP routes, and the LSPs are only used for BGP
next-hop resolution. If you want the LSPs to be used for IGP next-hop
resolution, you must configure
|
The remaining statements are explained separately. See CLI Explorer.
Required Privilege Level
routing—To view this statement in the configuration.
routing-control—To add this statement to the configuration.
Release Information
Statement introduced in Junos OS Release 9.3.
Support for IPv6 for IGP shortcuts introduced in Junos OS Release 9.3.
Support for inet-mpls and inet6-mpls statements
introduced in Junos OS Release 17.2 for the MX Series routers, PTX
Series routers, QFX5100, and QFX10000 switches.