Catatan Bird Config (BIRD.CONF)

Berikut isi file /usr/local/etc/bird.conf 

# Configure logging
log syslog { debug, trace, info, remote, warning, error, auth, fatal, bug };
log stderr all;
#log "tmp" all;

# Override router ID
router id 10.60.60.2;
protocol kernel {

#       learn;                  # Learn all alien routes from the kernel
        persist;                # Don't remove routes on bird shutdown
        scan time 20;           # Scan kernel routing table every 20 seconds
#       import none;            # Default is import all
        export all;             # Default is export none
#       kernel table 5;         # Kernel table to synchronize with (default: main)
}

# This pseudo-protocol watches all interface up/down events.
protocol device {
        scan time 10;           # Scan interfaces every 10 seconds
}

# Static routes (again, there can be multiple instances, so that you
# can disable/enable various groups of static routes on the fly).
protocol static {
#       disabled;               # Disable by default
#       table testable;         # Connect to a non-default table
#       preference 1000;        # Default preference of routes
#       debug { states, routes, filters, interfaces, events, packets };
#       debug all;
#       route 0.0.0.0/0 via 198.51.100.13;
#       route 198.51.100.0/25 unreachable;
#       route 10.0.0.0/8 unreachable;
#       route 10.1.1.0:255.255.255.0 via 198.51.100.3;
#       route 10.1.2.0:255.255.255.0 via 198.51.100.3;
#       route 10.1.3.0:255.255.255.0 via 198.51.100.4;
#       route 10.2.0.0/24 via "arc0";
        route 103.166.141.0/32 via 10.60.60.1;
}

protocol bgp CCR1036 {
        #disabled;
        description "BGP Peer to CCR1036";
        local as 65530;
        neighbor 10.60.60.1 as 139967;
        import filter {
        ##jika no label maka kasih label 65000:5678
        # bgp_community = -empty-; bgp_community = add(bgp_community,(65000,5678));

        ##jika terima aspath 7717 maka kasih tag 50310:7717
        if bgp_path ~ [= * 7717 * =] then
                bgp_community = add(bgp_community,(50310,7717));
        if bgp_path ~ [= * 7597 * =] then
                bgp_community = add(bgp_community,(50310,7597));
        ##jika origin AS7713 maka kasih tag 50310:7713
        if bgp_path ~ [= * 7713 =] then
                bgp_community = add(bgp_community,(50310,7713));
        ##contoh reject AS20940
        #if bgp_path ~ [= * 20940 * =] then reject;
        ##contoh reject prefix 45.126.184.0/22 saja
        #if net ~ [ 45.126.184.0/22 ] then reject;
        ##contoh reject prefix 45.126.184.0/22 sampai prefix terkecil
        #if net ~ [ 45.126.184.0/22+ ] then reject;
        ##contoh reject prefix 45.126.184.0/22 sampai prefix terkecil (cara lain)
        #if net ~ 45.126.184.0/22 then reject;
        ##contoh reject prefix 36.90.0.0/16 sampai prefix terkecil
        #if net ~ 36.90.0.0/16 then reject;
        ##yg matching bgp community 50310:17451 ditambahkan tag 39967:17451
        if (50310,17451) ~ bgp_community then bgp_community.add((39967,17451));
        ##selain diatas maka accept
        accept;
        };
}

Berikut CheatSet untuk trobelshoting masalah routing bgp

root@BSDRouter:~ # birdc
BIRD 1.6.8 ready.
bird> show protocols
name     proto    table    state  since       info
kernel1  Kernel   master   up     23:07:34
device1  Device   master   up     23:07:34
static1  Static   master   up     23:07:34
CCR1036  BGP      master   up     04:44:52    Established
bird>

bird> show protocols all CCR1036
name     proto    table    state  since       info
CCR1036  BGP      master   up     04:44:52    Established
  Description:    BGP Peer to CCR1036
  Preference:     100
  Input filter:   (unnamed)
  Output filter:  REJECT
  Routes:         20994 imported, 0 exported, 20994 preferred
  Route change stats:     received   rejected   filtered    ignored   accepted
    Import updates:         231033          0         18     206404      24611
    Import withdraws:         1430          0        ---       1408         40
    Export updates:          24612      24611          1        ---          0
    Export withdraws:           40        ---        ---        ---          0
  BGP state:          Established
    Neighbor address: 10.60.60.1
    Neighbor AS:      139967
    Neighbor ID:      103.146.185.254
    Neighbor caps:    refresh AS4
    Session:          external AS4
    Source address:   10.60.60.2
    Hold timer:       138/180
    Keepalive timer:  3/60

bird> show route where net ~ 45.126.184.0/22 all

45.126.185.0/24    via 10.60.60.1 on vlan605 [CCR1036 05:24:46] * (100) [AS17451i]
        Type: BGP unicast univ
        BGP.origin: IGP
        BGP.as_path: 139967 17451
        BGP.next_hop: 10.60.60.1
        BGP.local_pref: 100
        BGP.community: (0,32934) (17451,7033) (50310,17451) (39967,17451)
45.126.184.0/24    via 10.60.60.1 on vlan605 [CCR1036 05:24:45] * (100) [AS17451i]
        Type: BGP unicast univ
        BGP.origin: IGP
        BGP.as_path: 139967 17451
        BGP.next_hop: 10.60.60.1
        BGP.local_pref: 100
        BGP.community: (0,32934) (50310,17451) (39967,17451)
45.126.184.0/22    via 10.60.60.1 on vlan605 [CCR1036 05:24:46] * (100) [AS17451?]
        Type: BGP unicast univ
        BGP.origin: Incomplete
        BGP.as_path: 139967 17451
        BGP.next_hop: 10.60.60.1
        BGP.local_pref: 100
        BGP.atomic_aggr:
        BGP.aggregator: 182.253.99.245 AS17451
        BGP.community: (0,32934) (50310,17451) (39967,17451)

bonus aspath delete :

##bgp cut aspath 139967
if (bgp_path ~ [= 139967 * =]) && (bgp_path.last != 139967) then
bgp_path.delete(139967);

##bgp cut aspath 139967 dan 7717
if (bgp_path ~ [= 7717 * =]) then
bgp_path.delete(7717);

Semoga berguna :))