BGP

02.40 Around The Word

---BGP FEATURES---

EGP merupakan routing protokol yang digunakan untuk kebutuhan Inter-domain

Inter-domain routing protocol also known as EGP

Autonomous system is a set of routers under a single technical administration, using an IGP & common metrics to route packets within the AS, and using an EGP to route packets to other AS.

BGP exchanges routes between AS in a loop free manner.

Runs on top of the TCP port 179

Periodic keep-alives to verify connectivity

Rich metric (called path vectors or attributes)

Peers/Neighbours � any two routers that have formed a TCP connection in order to exchange BGP routing information.

---BGP NEIGHBOR---

Internal BGP

BGP Neighbor semestinya sama AS
BGP Neighbor tidak harus directly Connected

External BGP

BGP Neighbor semestinya beda AS
BGP Neighbor seharusnya directly Connected

---Policy Based Routing of BGP---

Administrator dapat membuat kebijakan atau aturan, bagaimana data akan dapat dilewati melalui AS atau bisa dikatakan hop-by-hop paradigma Routing.

---BGP METRIC---

Gambar diatas menunjukkan semua atribut yang digunakan oleh BGP
secara umum atribut BGP terbagi menjadi dua, yakni :

Well Known

Semua pabrikan perangkat merk apapun yang menjalankan BGP pasti mengenali dan memiliki atribut tipe ini.
Well known atribut terbagi menjadi dua yakni :

Mandatory

Atribut ini pasti ada setiap kali router menjalankan BGP

Terbagi menjadi 3 yaitu :

AS-Path, Menampilkan informasi jalur AS suatu route

                                   2. Next-Hop, Menampilkan ip via untuk menuju ke suatu route

                                   3. Origin, Menampilkan informasi dari mana route berasal,

   apakah dari BGP atau IGP yang di redistribute ke BGP

               2. Optional

Atribut ini baru ada apabila dikonfigurasikan, bila tidak dikonfigurasikan, maka atribut ini tidak dibawa serta oleh BGP

Terbagi menjadi 2 yakni :

Local Preference, digunakan untuk menentukan jalur upstream
Automic Aggregate. Merupakan suatu route hasil summarization

2. Optional

Atribut ini hanya dimiliki oleh beberapa pabrikan tertentu saja, tidak semua perangkat, yang menjalankan BGP mengenali dan memiliki fitur ini
Optional atribut terbagi menjadi dua yakni

Transitive

Atribut ini apabila tidak dikenali oleh perangkat tertentu, maka atribut ini akan tetap diteruskan ke yang lainnya

Terbagi menjadi dua yakni
Aggregator, merupakan router yang melakukan summarization
Community, terbagi menjadi 4
No-Export, atribut ini akan menjadikan suatu route di advertise hanya ke internal bgp saja.

No-Advertise, atribut ini akan menjadikan suatu route tidak diadvertise kemana-mana, baik internal maupun external.

Internet, atribut ini akan menjadikan route nya di advertise kemana saja

Local AS, atribut ini hanya ada pada bgp confederation,dimana route nya hanya akan di advertise ke dalam sub-as yang sama saja tidak di advertise ke sub AS yang lain.

2. Non Transitive

Atribut ini apabila tidak dikenali oleh perangkat tertentu, maka akan di drop atributnya oleh perangkat tersebut.

Terbagi menjadi 3 yaitu :
MED, digunakan untuk menentukan trafik kembali / downstream

Originator, menunjukkan router yang menjadi route reflector.

Cluster ID, menunjukkan nilai cluster id yang digunakan pada redundant route reflector.

---Pemilihan Route BGP---

Highest Weight
Highest Local Preference
Route originated by the local router
Shortest AS-Path
Lowest Origin code ( IGP < EGP)
Lowest MED from other AS
EBGP over IBGP
The Path through the closest IGP Neighbour
Oldest route for EBGP
Path with the lowest Neighbour BGP Router ID
Path with the lowest Neighbour IP

---BGP ATTRIBUTE---

Weight (Highest)
Local-Preference (Highest)
Locally Originated
AS-Path (Shortest)
Origin ( IGP > EGP > ? )
MED (Lowest)

Dari Pada Teori Terus, mari kita Ngelab Supaya lebih paham

Lab. 1 Konfigurasi Dasar iBGP Peering

R1(config)#int fa0/0

R1(config-if)#ip add 12.12.12.1 255.255.255.0

R1(config-if)#no sh

R1(config-if)#int fa0/1

R1(config-if)#ip add 21.21.21.1 255.255.255.0

R1(config-if)#no sh

R1(config-if)#int lo0

R1(config-if)#ip add 1.1.1.1 255.255.255.255

R1(config-if)#int lo1

R1(config-if)#ip add 10.10.10.10 255.255.255.255

R1(config-if)#

static route

R1(config)#ip route 2.2.2.2 255.255.255.0 fa0/0

IGP Jakarta

R1(config)#router eigrp 101

R1(config-router)#net 10.10.10.0

R1(config-router)#no au

Network Command and redistribution

R1(config)#router bgp 101

R1(config-router)#neighbor 2.2.2.2 remote-as 101

R1(config-router)#neighbor 2.2.2.2 update-source lo0

R1(config-router)#redistribute eigrp 101

R1(config-router)#network 12.12.12.0 mask 255.255.255.0

R2(config)#int fa0/0

R2(config-if)#ip add 12.12.12.2 255.255.255.0

R2(config-if)#no sh

R2(config-if)#int fa0/1

R2(config-if)#ip add 21.21.21.2 255.255.255.0

R2(config-if)#no sh

R2(config-if)#int lo0

R2(config-if)#ip add 2.2.2.2 255.255.255.255

R2(config-if)#int lo1

R2(config-if)#ip add 20.20.20.20 255.255.255.255

R2(config-if)#

IGP R2

R2(config)#ip route 1.1.1.1 255.255.255.255 fa0/0

R2(config)#router eigrp 101

R2(config-router)#net 20.20.20.0

R2(config-router)#no au

Network and redistribution

R2(config)#router bgp 101

R2(config-router)#neighbor 1.1.1.1 remote-as 101

R2(config-router)#neighbor 1.1.1.1 update-source lo0

R2(config-router)#redistribute eigrp 101

R2(config-router)#network 12.12.12.0 mask 255.255.255.0

CEK

Sh ip bgp summary

Sh ip bgp

Sh ip route bgp

Lab 2. iBGP Loopback and eBGP Loopback

R1(config)#int fa0/0

R1(config-if)#ip add 12.12.12.1 255.255.255.0

R1(config-if)#no sh

R1(config-if)#int lo0

R1(config-if)#ip add 1.1.1.1 255.255.255.255

R1(config-if)#int lo1

R1(config-if)#ip add 11.11.11.11 255.255.255.255

R1(config-if)#int lo2

R1(config-if)#ip add 111.111.111.111 255.255.255.255

IGP Jakarta

R1(config)#ip route 2.2.2.2 255.255.255.255 fa0/0

R1(config)#router rip

R1(config-router)#ver 2

R1(config-router)#net 11.0.0.0

R1(config-router)#net 111.0.0.0

R1(config-router)#no au

Network Command and Redistribution

R1(config)#router bgp 101

R1(config-router)#neighbor 2.2.2.2 remote-as 101

R1(config-router)#neighbor 2.2.2.2 update-source lo0

R1(config-router)#network 12.12.12.0 mask 255.255.255.0

R1(config-router)#network 111.111.111.111 mask 255.255.255.255

R1(config-router)#redistribute static

R1(config-router)#redistribute rip

R2(config)#int fa0/0

R2(config-if)#ip add 12.12.12.2 255.255.255.0

R2(config-if)#no sh

R2(config-if)#int s0/0

R2(config-if)#ip add 23.23.23.2 255.255.255.0

R2(config-if)#no sh

R2(config-if)#int lo0

R2(config-if)#ip add 2.2.2.2 255.255.255.255

R2(config-if)#int lo1

R2(config-if)#ip add 22.22.22.22 255.255.255.255

R2(config-if)#int lo2

R2(config-if)#ip add 222.222.222.222 255.255.255.255

R2 IGP

R2(config)#ip route 1.1.1.1 255.255.255.255 fa0/0

R2(config)#ip route 3.3.3.3 255.255.255.255 s0/0

R2(config)#router rip

R2(config-router)#ver 2

R2(config-router)#net 22.0.0.0

R2(config-router)#net 222.0.0.0

R2(config-router)#no au

network command and redistribution

R2(config)#router bgp 101

R2(config-router)#neighbor 1.1.1.1 remote-as 101

R2(config-router)#neighbor 1.1.1.1 update-source lo0

R2(config-router)#neighbor 3.3.3.3 remote-as 102

R2(config-router)#neighbor 3.3.3.3 update-source lo0

R2(config-router)#neighbor 3.3.3.3 ebgp-multihop

R2(config-router)#network 12.12.12.0 mask 255.255.255.0

R2(config-router)#network 23.23.23.0 mask 255.255.255.0

R2(config-router)#network 222.222.222.222 mask 255.255.255.255

R2(config-router)#redistribute rip

R2(config-router)#redistribute static

R3(config)#int s0/0

R3(config-if)#ip add 23.23.23.3 255.255.255.0

R3(config-if)#no sh

R3(config-if)#int lo0

R3(config-if)#ip add 3.3.3.3 255.255.255.255

R3(config-if)#int lo1

R3(config-if)#ip add 33.33.33.33 255.255.255.255

R3(config-if)#int lo2

R3(config-if)#ip add 223.223.223.223 255.255.255.255

R3 IGP

R3(config)#ip route 2.2.2.2 255.255.255.255 s0/0

R3(config)#router rip

R3(config-router)#ver 2

R3(config-router)#net 33.0.0.0

R3(config-router)#net 223.0.0.0

network Command and redistribution

R3(config)#router bgp 102

R3(config-router)#neighbor 2.2.2.2 remote-as 101

R3(config-router)#neighbor 2.2.2.2 update-source lo0

R3(config-router)#neighbor 2.2.2.2 ebgp-multihop

R3(config-router)#net 23.23.23.0 mask 255.255.255.0

R3(config-router)#net 223.223.223.223 mask 255.255.255.255

CEK

Sh ip bgp summary

Sh ip bgp

Sh ip route bgp

Lab 3. BGP Next-Hop-Self

R2(config)#router bgp 101

R2(config-router)#neighbor 1.1.1.1 remote-as 101

R2(config-router)#neighbor 1.1.1.1 next-hop-self

Sh ip bgp summary

Sh ip bgp

Sh ip route bgp

Ping 23.23.23.23.3

Ping 3.3.3.3

Ping 33.33.33.33

Ping 223.223.223.223

Sh ip bgp summary

Sh ip bgp

Sh ip route bgp

Ping ke R1 dan R2

Sh ip bgp summary

Sh ip bgp

Sh ip route bgp

Ping ke R1 dan R2

Lab 4. BGP Authentication

Konfigurasi BGP

R1(config)#router bgp 101

R1(config-router)#neighbor 2.2.2.2 password 0 rahasia

R2(config)#router bgp 101

R2(config-router)# neighbor 1.1.1.1 password 0 rahasia

Lab 5. BGP Route Reflector Client

R1(config)#int fa0/0

R1(config-if)#ip add 12.12.12.1 255.255.255.0

R1(config-if)#no sh

R1(config-if)int lo0

R1(config-if)ip add 1.1.1.1 255.255.255.255

IGP R1

R1(config)#ip route 2.2.2.2 255.255.255.255 fa0/0

Network command and redistribution

R1(config)#router bgp 123

R1(config-router)#neighbor 2.2.2.2 remote-as 123

R1(config-router)#neighbor 2.2.2.2 update-source lo0

R1(config-router)#net 12.12.12.0 mask 255.255.255.0

R1(config-router)#net 1.1.1.1 mask 255.255.255.255

R1(config-router)#redistribute static

R2(config)#int fa0/0

R2(config-if)#ip add 12.12.12.2 255.255.255.0

R2(config-if)#no sh

R2(config-if)#int lo0

R2(config-if)#ip add 2.2.2.2 255.255.255.255

R2(config-if)#int s0/0

R2(config-if)#ip add 23.23.23.2 255.255.255.0

R2(config-if)#no sh

IGP R2

R2(config)#ip route 1.1.1.1 255.255.255.255 fa0/0

R2(config)#ip route 3.3.3.3 255.255.255.255 s0/0

Network command, route reflector and redistribution

R2(config)#router bgp 123

R2(config-router)#neighbor 1.1.1.1 remote-as 123

R2(config-router)#neighbor 1.1.1.1 update-source lo0

R2(config-router)#neighbor 1.1.1.1 route-reflector-client

R2(config-router)#neighbor 3.3.3.3 remote-as 123

R2(config-router)#neighbor 3.3.3.3 update-source lo0

R2(config-router)#neighbor 3.3.3.3 route-reflector-client

R2(config-router)#net 12.12.12.0 mask 255.255.255.0

R2(config-router)#net 23.23.23.0 mask 255.255.255.0

R2(config-router)#net 2.2.2.2 mask 255.255.255.255

R2(config-router)#redistribute static

R3(config)#int s0/0

R3(config-if)#ip add 23.23.23.3 255.255.255.0

R3(config-if)#no sh

R3(config-if)#int lo0

R3(config-if)#ip add 3.3.3.3 255.255.255.255

IGP R3

R3(config)#ip route 2.2.2.2 255.255.255.255 s0/0

Network command and redistribution

R3(config)#router bgp 123

R3(config-router)#neighbor 2.2.2.2 remote-as 123

R3(config-router)#neighbor 2.2.2.2 update-source lo0

R3(config-router)#net 23.23.23.0 mask 255.255.255.255

R3(config-router)#net 3.3.3.3 mask 255.255.255.255

R3(config-router)#redistribute static

Sh ip bgp summary

Sh ip bgp

Sh ip route bgp

Ping ke R1,R2,R3

Lab 6. BGP ATTRIBUT ORIGIN

Catatan :

i = route yang berasal dari BGP (eBGP/iBGP) yang diadvertise melalui perintah network x.x.x.x mask y.y.y.y
e = route yang berasal dari protocol EGP (saat ini sudah tidak ada protocol tersebut)
? = route yang berasal dari protocol lain (static / RIP / OSPF / EIGRP) yang di redistribute ke dalam BGP

R1 untuk menuju network 2.2.2.2 dan 3.3.3.3 adalah via " 200 i " yang artinya Next AS Path adalah AS 200 dan nilai origin dari routernya adalah i

R1 untuk menuju network 30.30.30.30/32 dab 33.33.33.33/32 adalah via " 200 ?" yang artinya Next AS Path adalah AS 200 dan nilai origin adalah ?

Lab 7. BGP ATTRIBUTE COMMUNITY

Pada lab ini kita akan belajar tentang BGP Attribute Community
Cek BGP route di R1 dan R4
Set community �no-export� di R1 (no-export tidak di advertise ke Ebgp)
Cek BGP route di R3 dan R4 pastikan network 11.11.11.11/32 sudah tidak ada.
Set community �no-advertise� di R3 (no-advertise tidak di advertise di Ibgp dan Ebgp)
Cek BGP Route di R1 dan R4 pastikan network 33.33.33.33/32 sudah tidak ada.
Set community �local-AS� (di advertise hanya di confederation Ibgp saja).
Artinya konfigurasi iBGP (R1, R2, dan R3) harus dirubah dari route reflector menjadi confederation.

R1 (NO-EXPORT)

access-list 1 permit host 11.11.11.11

route-map NO-EXPORT

match ip add 1

set community no-export

router bgp 123

neighbor 2.2.2.2 route-map NO-EXPORT out

neighbor 2.2.2.2 send-community

R3 (NO-ADVERTISE)

Access-list 1 permit host 33.33.33.33

Route-map NO-ADVERTISE

Match ip add 1

Set community no-advertise

Router bgp 123

Neighbor 2.2.2.2 route-map NO-ADVERTISE out

Neighbor 2.2.2.2 send-community

R1 (LOCAL-AS)

no router bgp 123

router bgp 12

bgp confederation identifiers 123

network 11.11.11.11 mask 255.255.255.255

neighbor 12.12.12.2 remote-as 12

neighbor 12.12.12.2 route-map LOCAL-AS

neighbor 12.12.12.2 send community

access-list 2 permit host 11.11.11.11

route-map LOCAL-AS

match ip add 2

set community local-As

R2 (LOCAL-AS)

no router bgp 123

router bgp 12

bgp confederation identifier 123

bgp confederation peers 3

neighbor 24.24.24.4 remote-as 4

neighbor 12.12.12.1 remote-as 12

neighbor 12.12.12.1 next-hop-self

neighbor 23.23.23.23.3 remote-as 3

neighbor 23.23.23.3 next-hop-self

network 22.22.22.22 mask 255.255.255.255

R3 (LOCAL-AS)

no router bgp 123

router bgp 3

bgp confederation identifier 123

bgp confederation peers 12

neighbor 23.23.23.2 remote-as 12

network 33.33.33.33 mask 255.255.255.255

Lab 8. BGP PEERS GROUP

R1(config)#interface fa0/0

R1(config-if)#ip add 12.12.12.1 255.255.255.0

R1(config-if)#no sh

R1(config-if)#interface lo0

R1(config-if)#ip add 1.1.1.1 255.255.255.255

R1(config-if)#interface lo1

R1(config-if)#ip add 11.11.11.11 255.255.255.255

R1(config-if)#router eigrp 1

R1(config-router)#net 12.12.12.1 0.0.0.0

R1(config-router)#net 1.1.1.1 0.0.0.0

R1(config)#router bgp 123

router bgp 123

neighbor INTERNAL peer-group

neighbor INTERNAL remote-as 123

neighbor INTERNAL update-source lo0

neighbor 2.2.2.2 peer-group INTERNAL

neighbor 3.3.3.3 peer-group INTERNAL

network 11.11.11.11 mask 255.255.255.255

R2(config)#interface fa0/0

R2(config-if)#ip add 12.12.12.2 255.255.255.0

R2(config-if)#no sh

R2(config-if)#int s0/0

R2(config-if)#ip add 24.24.24.2 255.255.255.0

R2(config-if)#no sh

R2(config-if)#int fa0/1

R2(config-if)#ip add 23.23.23.2 255.255.255.0

R2(config-if)#no sh

R2(config-if)#int lo0

R2(config-if)#ip add 2.2.2.2 255.255.255.255

R2(config-if)#int lo1

R2(config-if)#ip add 22.22.22.22 255.255.255.255

R2(config-if)#router eigrp 1

R2(config-router)#net 12.12.12.2 0.0.0.0

R2(config-router)#net 23.23.23.2 0.0.0.0

R2(config-router)#net 2.2.2.2 0.0.0.0

R2(config-router)#router bgp 123

router bgp 123

neighbor INTERNAL peer-group

neighbor INTERNAL remote-as 123

neighbor INTERNAL update-source lo0

neighbor INTERNAL next-hop-self

neighbor 1.1.1.1 peer-group INTERNAL

neighbor 3.3.3.3 peer-group INTERNAL

neighbor 24.24.24.4 remote-as 4

network 22.22.22.22 mask 255.255.255.255

R3(config)#int fa0/0

R3(config-if)#ip add 23.23.23.3 255.255.255.0

R3(config-if)#no sh

R3(config-if)#int lo0

R3(config-if)#ip add 3.3.3.3 255.255.255.255

R3(config-if)#int lo1

R3(config-if)#ip add 33.33.33.33 255.255.255.255

R3(config-if)#router eigrp 1

R3(config-router)#net 23.23.23.3 0.0.0.0

R3(config-router)#net 3.3.3.3 0.0.0.0

router bgp 123

neighbor INTERNAL peer-group

neighbor INTERNAL remote-as 123

neighbor INTERNAL update-source lo0

neighbor 1.1.1.1 peer-group INTERNAL

neighbor 2.2.2.2 peer-group INTERNAL

network 33.33.33.33 mask 255.255.255.255

R4(config)#int s0/0

R4(config-if)#ip add 24.24.24.4 255.255.255.0

R4(config-if)#no sh

R4(config-if)#int lo0

R4(config-if)#ip 4.4.4.4 255.255.255.255

router bgp 4

neighbor 24.24.24.2 remote-as 123

network 4.4.4.4 mask 255.255.255.255

Lab 9. BGP AGGREGRATOR

int lo1

ip add 40.1.1.1 255.255.255.255

int lo2

ip add 40.2.1.1 255.255.255.255

int lo3

ip add 40.3.1.1 255.255.255.255

int lo4

ip add 40.4.1.1 255.255.255.255

int lo5

ip add 40.5.1.1 255.255.255.255

int lo6

ip add 40.6.1.1 255.255.255.255

router bgp 4

network 40.1.1.1 mask 255.255.255.255

network 40.2.1.1 mask 255.255.255.255

network 40.3.1.1 mask 255.255.255.255

network 40.4.1.1 mask 255.255.255.255

network 40.5.1.1 mask 255.255.255.255

network 40.6.1.1 amsk 255.255.255.255

aggregate-address 40.0.0.0 255.248.0.0

aggregate-address 40.0.0.0 255.248.0.0 summary-only

selanjutnya konfigurasikan aggregate suppress Map di R4

access-list 1 permit host 40.2.1.1

access-list 1 permit hsot 40.3.1.1

access-list 1 permit host 40.4.1.1

access-list 1 deny any

route-map BLOK

match ip address 1

router bgp 4

aggregate-address 40.0.0.0 255.248.0.0 suppress-map BLOK

Lab 10. BGP LOCAL AS

Router R1

R1(config)#int fa0/0

R1(config-if)#ip add 12.12.12.1 255.255.255.0

R1(config-if)#no sh

R1(config-if)#int lo0

R1(config-if)#ip add 1.1.1.1 255.255.255.255

R1(config-if)#int lo2

R1(config-if)#ip add 1.1.1.2 255.255.255.255

R1(config-if)#int lo3

R1(config-if)#ip add 1.1.1.3 255.255.255.255

R1(config-if)#router bgp 100

R1(config-router)#neighbor 12.12.12.2 remote-as 65000

R1(config-router)#network 1.1.1.1 mask 255.255.255.255

R1(config-router)#network 1.1.1.2 mask 255.255.255.255

R1(config-router)#network 1.1.1.3 mask 255.255.255.255

Router R2

R2(config)#int fa0/0

R2(config-if)#ip add 12.12.12.2 255.255.255.0

R2(config-if)#no sh

R2(config)#int fa0/1

R2(config-if)#ip add 23.23.23.2 255.255.255.0

R2(config-if)#no sh

R2(config-if)#int lo0

R2(config-if)#ip add 2.2.2.2 255.255.255.255

R2(config)#router bgp 200

R2(config-router)#neighbor 12.12.12.1 remote-as 100

R2(config-router)#neighbor 12.12.12.1 local-as 65000

R2(config-router)#neighbor 23.23.23.3 remote-as 300

Router R3

R3(config)#int fa0/0

R3(config-if)#ip add 23.23.23.3 255.255.255.0

R3(config-if)#no sh

R3(config-if)#int lo0

R3(config-if)#ip add 3.3.3.3 255.255.255.255

R3(config)#router bgp 300

R3(config-router)#neighbor 23.23.23.2 remote-as 200

R3(config-router)#network 3.3.3.3 mask 255.255.255.255

Cek hasilnya routenya di R3

Konfigurasikan local-as no prepend di router R2

R2(config-router)router bgp 200

R2(config-router)neighbor 12.12.12.1 local-as 65000 no-prepend

Cek kembali hasil route no-prepend pada R3

Konfigurasikan local-as no-prepend replace-as di R3 serta rubah remote-as R4

R3(config-router)neighbor 12.12.12.1 local-as 65000 no-prepend replace-as

R3(config-router)neighbor 23.23.23.3 local-as 65000 no-prepend replace-as

R4(config)#router bgp 300

R4(config-router)#neighbor 23.23.23.2 remote-as 65000

Cek kembali hasil route no-prepend pada R3

Lab 11. BGP MANIPULASI JALUR

R1(config)#int fa0/0

R1(config-if)#ip add 13.13.13.1 255.255.255.0

R1(config-if)#no sh

R1(config-if)int s0/0

R1(config-if)ip add 12.12.12.1 255.255.255.0

R1(config-if)#no sh

R1(config-if)#int lo0

R1(config-if)#ip add 1.1.1.1 255.255.255.255

R1(config-if)#router eigrp 10

R1(config-if)#net 12.12.12.1 0.0.0.0

R1(config-if)#net 13.13.13.1 0.0.0.0

R1(config)#router bgp 1

R1(config-router)#neighbor 12.12.12.2 remote-as 23

R1(config-router)#neighbor 13.13.13.3 remote-as 23

R1(config-router)#net 1.1.1 mask 255.255.255.255

R2(config)#int s0/0

R2(config-if)#ip add 12.12.12.2 255.255.255.0

R2(config-if)#no sh

R2(config-if)#int fa0/0

R2(config-if)#ip add 23.23.23.2 255.255.255.0

R2(config-if)#no sh

R2(config)#router eigrp 10

R2(config-router)#net 12.12.12.2 0.0.0.0

R2(config-router)#net 23.23.23.2 0.0.0.0

R2(config)#router bgp 23

R2(config-router)#neighbor 12.12.12.1 remote-as 1

R2(config-router)#neighbor 23.23.23.3 remote-as 23

R2(config-router)#

R3(config)#int fa0/1

R3(config-if)#ip add 23.23.23.3 255.255.255.0

R3(config-if)#no sh

R3(config-if)#int fa0/0

R3(config-if)#ip add 12.12.12.3 255.255.255.0

R3(config-if)#no sh

R3(config-if)#int lo0

R3(config-if)#ip add 3.3.3.3 255.255.255.255

R3(config-if)#router eigrp 10

R3(config-if)net 23.23.23.3 0.0.0.0

R3(config-if)net 12.12.12.2 0.0.0.0

R3(config)#router bgp 23

R3(config-router)#neighbor 12.12.12.1 remote-as 1

R3(config-router)#neighbor 23.23.23.2 remote-as 23

R3(config-router)#net 3.3.3.3 mask 255.255.255.255

Lakukan verifikasi pada R1

Terlihat pada console bahwasannya untuk menuju ke network 3.3.3.3/32 ada 2 next hop yaitu 12.12.12.2 dan 13.13.13.3. tanda *> di sebelah kiri menunjukkan bahwa next hop terpilih adalah 13.13.13.3

Lab 12. BGP MINDAH JALUR BY MED

route-map MED

set metric 200

router bgp 23

neighbor 13.13.13.1 route-map MED out

verifikasi kembali

Lab 13. BGP MINDAH JALUR BY AS-PATH

route-map AS

set as-path prepend 23.23.23.23

router bgp 23

neighbor 13.13.13.1 route-map AS out

BGP dalam hal ini bekerja seperti RIP yakni menggunakan hop count, bedanya adalah pada BGP yang dihitung adalah jumlah AS Number yang dilewati. yang paling sedikit akan dipilih. sehingga agar jalur yang digunakan melalui R2 terlebih dahulu, maka jalur R1 - R3 dibuat seolah-olah melalui AS yang banyak sehingga tidak akan dipilih sebagai jalur utama. pada contoh diatas melewati 23.23.23.23

Lab 14. BGP MINDAH JALUR BY WEIGHT

route-map WEIGHT permit 10

set weight 100

router bgp 1

neighbor 12.12.12.2 route-map WEIGHT in

Verifikasi

Nilai weight terbesar dipilih, maka link neighbor menuju R2 dibuat besar yakni menjadi 100, seperti terlihat di jalur menuju 3.3.3.3 yang melalui R2 (12.12.12.2) weight nya bernilai 100, sedangkan yang melalui R3 (13.13.13.3) weight nya lebih rendah yakni 0. Maka jalur ke R2 yang dipilih.

Lab 15. BGP MINDAH JALUR BY LOCAL-PREFERENCE

route-map LOC_PREF permit 10

set local-preference 200

router bgp 1

neighbor 12.12.12.2 route-map LOC_PREF in

Selasa, 11 Desember 2012

BGP

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