Juniper JUNOS BGP Routing

15 March 2025 Jaringan Komputer

Definisikan AS number dan Router ID

Definisikan router id

set routing-options router-id 12.23.34.45

Definisikan AS number

set routing-options autonomous-system 141234

Definisikan IP address (optional but recommended)

set interfaces lo0 unit 0 family inet address 192.0.2.0/32

Definisikan Prefix

Ketika kita akan melakukan advertise prefix ke internet untuk IPv4 panjang minimum yang boleh di advertise ke internet adalah /24, di juniper agar bisa kita advertise syarat utamanya adalah prefix tersebut harus ada di routing table. kita tambahkan menggunakan static route prefix dengan action discard (blackhole). tak perlu khawatir karena jika di jaringan internal kita membagi ke subnet subnet yang lebih kecil maka prefix/subnet tersebut tidak akan di discard/blackhole karena prefixnya lebih spesifik dan akan di utamakan.

set routing-options static route 192.0.2.0/24 discard

Prefix List

prefix-list di juniper berfungsi untuk menambahkan list beberapa prefix kedalam satu nama group, prefix-list biasanya dibagungkan dengan routing filter, prefix-list hanya akan cocok jika network dan panjang prefix nya sama

set policy-options prefix-list my-prefixes 192.0.2.0/24
set policy-options prefix-list customer-prefixes 198.51.100.0/24
set policy-options prefix-list customer-prefixes 203.0.113.0/24

Show configuration

show policy-options
prefix-list my-prefixes {
    192.0.2.0/24;
}
prefix-list customer-prefixes {
    198.51.100.0/24;
    203.0.113.0/24;
}

Route Filter List

Fungsinya sama dengan prefix-list namun dengan kelebihan bisa menyesuaikan panjang prefix (Range), jika di cisco adalah ge & le

— SOON —

Membuat Routing Filter (Policy Statement)

Example Filter In

Berikut adalah contoh filter in

set policy-options policy-statement EBGP-PEER-IN term 1 from prefix-list my-prefixes
set policy-options policy-statement EBGP-PEER-IN term 1 then reject
set policy-options policy-statement EBGP-PEER-IN term 2 from prefix-list customer-prefixes
set policy-options policy-statement EBGP-PEER-IN term 2 then accept
set policy-options policy-statement EBGP-PEER-IN term reject-else then reject

Show configuration

show policy-options policy-statement EBGP-PEER-IN
term 1 {
    from {
        prefix-list my-prefixes;
    }
    then reject;
}
term 2 {
    from {
        prefix-list customer-prefixes;
    }
    then accept;
}
term reject-else {
    then reject;
}

Example Filter Out

Berikut adalah contoh filter out

set policy-options policy-statement EBGP-PEER-OUT term 1 from prefix-list my-prefixes
set policy-options policy-statement EBGP-PEER-OUT term 1 then accept
set policy-options policy-statement EBGP-PEER-OUT term reject-else then reject

Show configuration

show policy-options policy-statement EBGP-PEER-OUT
term 1 {
    from {
        prefix-list my-prefixes;
    }
    then accept;
}
term reject-else {
    then reject;
}

Example Filter with Community

Berikut contoh routing filter-out untuk advertise prefix dan menambahkan attribute community

set policy-options community COMMUNITY-NAME members 65505:90099
set policy-options policy-statement EBGP-PEER-OUT term 1 from prefix-list my-prefixes
set policy-options policy-statement EBGP-PEER-OUT term 1 then community add COMMUNITY-NAME
set policy-options policy-statement EBGP-PEER-OUT term 1 then accept
set policy-options policy-statement EBGP-PEER-OUT term reject-else then reject

Show configuration

policy-options {
    policy-statement EBGP-PEER-OUT {
        term 1 {
            from {
                prefix-list my-prefixes;
            }
            then {
                community add COMMUNITY-NAME;
                accept;
            }
        }
        term reject-else {
            then reject;
        }
    }
    community COMMUNITY-NAME members 65505:90099;
}

Example Filter with Large Community

Berikut contoh routing filter-out untuk advertise prefix dan menambahkan attribute large community

set policy-options community COMMUNITY-NAME members large:65505:0:17885
set policy-options policy-statement EBGP-PEER-OUT term 1 from prefix-list my-prefixes
set policy-options policy-statement EBGP-PEER-OUT term 1 then community add COMMUNITY-NAME
set policy-options policy-statement EBGP-PEER-OUT term 1 then accept
set policy-options policy-statement EBGP-PEER-OUT term reject-else then reject

Setup Peering

set protocols bgp group EBGP.PEER type external
set protocols bgp group EBGP.PEER neighbor 169.254.0.2 description PEER-DESCRIPTION
set protocols bgp group EBGP.PEER neighbor 169.254.0.2 import EBGP-PEER-IN
set protocols bgp group EBGP.PEER neighbor 169.254.0.2 export EBGP-PEER-OUT
set protocols bgp group EBGP.PEER neighbor 169.254.0.2 peer-as 14789

Show configuration

type external;
neighbor 169.254.0.2 {
    description PEER-NAME;
    import EBGP-PEER-IN;
    export EBGP-PEER-OUT;
    peer-as 14789;
}