Step 1: Verify BGP on an Internal Router

Action

To verify the BGP configuration of an internal router, enter the following JUNOS command-line interface (CLI) command:

user@host> show configuration

Sample Output

The following sample output is for a BGP configuration on R3 in the network shown in Figure 14:

user@R3> show configuration

[...Output truncated...]

interfaces {

    so-0/0/1 {

        unit 0 {

            family inet {

                address 10.1.23.2/30;

            }

            family iso;

        }

    }

    so-0/0/3 {

        unit 0 {

            family inet {

                address 10.1.36.1/30;

            }

            family iso;

        }

    }

    lo0 {

        unit 0 {

            family inet {

                address 10.0.0.3/32;

            }

            family iso {

                address 49.0002.1000.0000.0003.00;

            }

        }

    }

}

routing-options {

    [...Output truncated...]

    router-id 10.0.0.3;

    autonomous-system 65002;

}

protocols {

    bgp {

        group internal {

            type internal;

            local-address 10.0.0.3;

            neighbor 10.0.0.2;

            neighbor 10.0.0.4;

            neighbor 10.0.0.6;

        }

    }

    isis {

        level 1 disable;

        interface all {

            level 2 metric 10;

        }

        interface lo0.0;

    }

}

user@R6> show configuration |

[Output truncated...]

interfaces {

    so-0/0/1 {

        unit 0 {

            family inet {

                address 10.1.46.2/30;

            }

            family iso;

        }

    }

    so-0/0/3 {

        unit 0 {

            family inet {

                address 10.1.36.2/30;

            }

            family iso;

        }

    }

    lo0 {

        unit 0 {

            family inet {

                address 10.0.0.6/32;

            }

            family iso {

                address 49.0003.1000.0000.0006.00;

            }

        }

    }

}

routing-options {

    [Output truncated...]

    router-id 10.0.0.6;

    autonomous-system 65002;

}

protocols {

    bgp {

        group internal {

            type internal;

            local-address 10.0.0.6;

            neighbor 10.0.0.2;

            neighbor 10.0.0.3;

            neighbor 10.0.0.4;

        }

    }

    isis {

        level 1 disable;

        interface all {

            level 2 metric 10;

        }

        interface lo0.0;

    }

}

What It Means

The sample output shows a basic BGP configuration on routers R3 and R6. The local AS (65002) and one group (internal) are configured on both routers. R3 has three internal peers—10.0.0.2, 10.0.0.4, and 10.0.0.6—included at the [protocols bgp group group] hierarchy level. R6 also has three internal peers: 10.0.0.2, 10.0.0.3, and 10.0.0.4. The underlying IGP protocol is Intermediate System-to-Intermediate System (IS-IS), and relevant interfaces are configured to run IS-IS.

Note that in this configuration the router ID is manually configured to avoid any duplicate router ID problems.