Routing Instances Configuration Guidelines

You can create multiple instances of Border Gateway Protocol (BGP), Intermediate System-to-Intermediate System (IS-IS), Label Distribution Protocol (LDP), Open Shortest Path First Version 2 (OSPF), Open Shortest Path First version 3 (OSPFv3), Protocol Independent Multicast (PIM), Routing Information Protocol (RIP), and static routes by including statements at the following hierarchy levels:

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

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

Each routing instance consists of sets of the following:

• Routing tables
• Interfaces that belong to these routing tables
• Routing option configurations

You can configure six types of routing instances:

• Forwarding—Use this routing instance type for filter-based forwarding applications. For this instance type, there is no one-to-one mapping between an interface and a routing instance. All interfaces belong to the default instance inet.0.
• Layer 2 VPN—Use this routing instance type for Layer 2 virtual private network (VPN) implementations.
• Nonforwarding—Use this routing instance type when a separation of routing table information is required. There is no corresponding forwarding table. All routes are installed into the default forwarding table. IS-IS instances are strictly nonforwarding instance types.
• Virtual router—Similar to a VPN routing and forwarding instance type, but used for non-VPN-related applications. There are no VRF import, VRF export, VRF target, or route distinguisher requirements for this instance type.
• VPLS—Virtual private local-area network (LAN) service. Use this routing instance type for point-to-multipoint LAN implementations between a set of sites in a VPN.
• VRF—VPN routing and forwarding. Use this routing instance type for Layer 3 VPN implementations. For this instance type, there is a one-to-one mapping between an interface and a routing instance. Each VRF instance corresponds with a forwarding table. Routes on an interface go into the corresponding forwarding table.

For more detailed information about configuring VPNs and Layer 2 VPNs, see the JUNOS Internet Software Configuration Guide: VPNs.

This chapter describes the following tasks for configuring routing instances:

• Routing Instances Minimum Configuration on page 140
• Configure Multiple Instances of BGP on page 143
• Configure Multiple Instances of IS-IS on page 144
• Configure Multiple Instances of LDP on page 147
• Configure Multiple Instances of OSPF on page 148
• Configure Multiple Instances of PIM on page 152
• Configure Multiple Instances of RIP on page 153
• Configure an Instance on page 153
• Configure VPNs on page 154
• Configure an Instance Type on page 154
• Configure a Route Distinguisher (Address Extension) on page 155
• Configure Filter-Based Forwarding on page 155
• Configure Class of Service-Based Forwarding on page 157
• Configure Secondary VRF Import and Export Policy on page 158
• Configure Policy-based Export for Routing Instances on page 159
• Configure a VRF Table Label on page 164
• Configure a VRF Target on page 164
• Configure an OSPF Domain ID on page 164
• Configure a Route Limit for Routing Tables on page 168

To configure routing instances, include the following statements:

[edit]

routing-instances {

    routing-instance-name { 

        description text;

        forwarding-options;

        interface interface-name;

        instance-type (forwarding | l2vpn | no-forwarding | virtual-router | vpls | vrf);

        route-distinguisher (as-number:number  |  ip-address:number);

        vrf-import [ policy-names ];

        vrf-export [ policy--names ];

        vrf-table-label; 

        vrf-target {

            export community-name;

            import community-name;

        }

        protocols {

            bgp {

                bgp-configuration;

            }

            isis {

                isis-configuration;

            }

            l2vpn {

                l2vpn-configuration;

            }

            ldp {

                ldp-configuration;

            }

            ospf {

                domain-id domain-id;

                domain-vpn-tag number;

                route-type-community (iana | vendor);

                ospf-configuration;

            }

            ospf3 {

                domain-id domain-id;

                domain-vpn-tag number;

                route-type-community (iana | vendor);

                ospf3-configuration;

            }

            pim {

                pim-configuration;

            }

            rip {

                rip-configuration;

            }

            vpls {

                vpls-configuration;

            }

        }

        routing-options {

            aggregate {

                defaults {

                    aggregate-options;

                }

                route destination-prefix {

                    policy policy-name;

                    aggregate-options;

                }

            }

            auto-export {

                (disable | enable);

                family {

                    inet {

                        multicast {

                            (disable | enable);

                            rib-group rib-group;

                        }

                        unicast {

                            (disable | enable);

                            rib-group rib-group;

                        }

                    }

                }

                traceoptions {

                    file name <replace> <size size> <files number> <no-stamp> <world-readable>; 

                    flag flag <flag-modifier> <disable>; 

                }

            }

            autonomous-system autonomous-system <loops number>;

            confederation confederation-autonomous-system members autonomous-system;

            fate-sharing { 

                group group-name;

                cost value;

                from address [to address];

            }

            forwarding-table {

                export [ policy-names ];

            } 

            generate {

                defaults {

                    generate-options;

                }

                route destination-prefix {

                    policy policy-name;

                    generate-options;

                }

            }

            instance-export [ policy-names ];

            instance-import [ policy-names ];

            interface-routes {

                rib-group group-name;

            }

            martians {

                destination-prefix match-type <allow>; 

            }

            maximum-routes route-limit <log-only | threshold value>;

            multicast { 

                scope scope-name {

                    interface interface-name;

                    prefix destination-prefix;

                }

                ssm-groups {

                    addresses;

                }

            }

            options {

                syslog (level level | upto level);

            }

            resolution {

                tracefilter [ policy-names ];

                traceoptions {

                    file name <replace> <size size> <files number> <no-stamp> 

                        <(world-readable | no-world-readable)>;

                    flag flag <flag-modifier> <disable>;

                }

            }

            rib routing-table-name {

                aggregate {

                    defaults {

                        aggregate-options;

                    }

                    route destination-prefix {

                        policy policy-name;

                        aggregate-options;

                    }

                }

                generate {

                    defaults {

                        generate-options;

                    }

                    route destination-prefix {

                        policy policy-name;

                        generate-options;

                    }

                }

                martians {

                    destination-prefix match-type <allow>; 

                }

                static {

                    defaults {

                        static-options;

                    }

                    rib-group group-name;

                    route destination-prefix {

                        lsp-next-hop {

                            metric metric;

                            preference preference;

                        }

                        next-hop;

                        qualified-next-hop {

                            metric metric;

                            preference preference;

                        }

                        static-options;

                    }

                }

            }

            rib-groups {

                group-name {

                    import-policy [ policy-names ;

                    import-rib [ group-names ];

                    export-rib group-name; 

                }

            }

            route-record;

            router-id address;

            static {

                defaults {

                    static-options;

                }

                rib-group group-name;

                route destination-prefix {

                    lsp-next-hop {

                        metric metric;

                        preference preference;

                    }

                    next-hop;

                    qualified-next-hop {

                        metric metric;

                        preference preference;

                    }

                    static-options;

                }

            }

            traceoptions {

                    file name <replace> <size size> <files number> <no-stamp> 

                        <(world-readable | no-world-readable)>;

                    flag flag <flag-modifier> <disable>; 

            }

        }

    }

}

You can configure the statements at the following hierarchy levels:

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