Configure a Routing Protocol Between the Service Provider Routers

The service provider routers need to be able to exchange routing information. You can configure the following protocols for the virtual-router routing instance protocols statement configuration at the [routing-instances routing-instance-name] hierarchy level:

• BGP
• ISIS
• LDP
• OSPF
• RIP

You can also configure static routes.

The following are not supported for virtual-router routing instances:

• IBGP route reflection
• Multicast routing

If you configure LDP under a virtual-router instance, by default LDP routes are placed in both the routing instance's inet.0 and inet.3 routing tables (for example, sample.inet.0 and sample.inet.3). To restrict LDP routes to only the routing instance's inet.3 table, you must include the no-forwarding statement:

[edit routing-instances routing-instance-name protocols ldp]

no-forwarding;

You can configure this statement at the following hierarchy levels:

• [edit routing-instances routing-instance-name protocols ldp]
• [edit logical-routers logical-router-name routing-instances routing-instance-name protocols ldp]

This places the LDP routes only in to the inet.3 routing table, so the corresponding IGP route in the inet.0 routing table can be redistributed and advertised into other routing protocols.

For information on how to configure routing protocols, see the JUNOS Internet Software Configuration Guide: Routing and Routing Protocols.