LAB 3. eBGP Peering

Metode Lab

Konfigurasi pengalamatan IP sesuai topologi diatas
Konfigurasikan iBGP Peers antara R1 dan R2
BGP Peersnya menggunakan IP Interface Physycalnya
Interface Loopback untuk diadvertise ke BGP

Peering BGP bisa menggunakan IP Interface physycal ataupun IP Loopback, umumnya pada iBGP menggunakan IP Loopback, sedangkan eBGP IP Interface Physical. Berikut kita belajar melakukan peering dari IP interface physical. Router R1 dan R2

Kita konfigurasi terlebih dahulu IP address pada f1/0 di Router 2

R2(config)#int f1/0

R2(config-if)#ip add 23.23.23.2 255.255.255.0

R2(config-if)#no shutdown

Sekarang kita mengkonfigurasi IP Address pada router 3

R3(config)#int f0/0

R3(config-if)#ip add 23.23.23.3 255.255.255.0

R3(config-if)#no shutdown

R3(config-if)#exit

R3(config)#int loopback0

R3(config-if)#ip add 3.3.3.3 255.255.255.255

R3(config-if)#exit

Nah.. sekarang konfigurasi BGP

R2(config)#router bgp 12

R2(config-router)#neighbor 23.23.23.3 remote-as 3

R3(config)#router bgp 3

R3(config-router)#neighbor 23.23.23.2 remote-as 12

R3(config-router)#network 3.3.3.3 mask 255.255.255.255

Lalu cek BGP Peernya...

R3#sh ip bgp summary

BGP router identifier 3.3.3.3, local AS number 3

BGP table version is 4, main routing table version 4

3 network entries using 396 bytes of memory

3 path entries using 156 bytes of memory

4/3 BGP path/bestpath attribute entries using 672 bytes of memory

1 BGP AS-PATH entries using 24 bytes of memory

0 BGP route-map cache entries using 0 bytes of memory

0 BGP filter-list cache entries using 0 bytes of memory

Bitfield cache entries: current 1 (at peak 1) using 32 bytes of memory

BGP using 1280 total bytes of memory

BGP activity 3/0 prefixes, 3/0 paths, scan interval 60 secs

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd

23.23.23.2 4 12 7 5 4 0 0 00:02:15 2

Sekarang terlihat sudah ada 2 route

R3#sh ip bgp

BGP table version is 4, local router ID is 3.3.3.3

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

r RIB-failure, S Stale '

Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path

*> 3.3.3.3/32 0.0.0.0 0 32768 i

*> 11.11.11.11/32 23.23.23.2 0 12 i

*> 22.22.22.22/32 23.23.23.2 0 0 12 i

Sekarang kita cek dengan melakukan tes ping

R3#ping 11.11.11.11

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 11.11.11.11, timeout is 2 seconds:

.....

Success rate is 0 percent (0/5)

Tidak bisa di ping

R1#sh ip bgp

BGP table version is 3, local router ID is 11.11.11.11

Status codes: s \uppressed, d damped, h history, * valid, > best, i - internal,

r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path

* i3.3.3.3/32 23.23.23.3 0 100 0 3 i

*> 11.11.11.11/32 0.0.0.0 0 32768 i

*>i22.22.22.22/32 2.2.2.2 0 100 0 i

Sekarang kita cek routing table di R1

R1#sh ip route bgp

22.0.0.0/32 is subnetted, 1 subnets

B 22.22.22.22 [200/0] via 2.2.2.2, 03:05:04

Sekarang kita bisa melihat bahwa tidak ada satupun route yang berasal dari R3 .

Ada beberapa cara yang bisa kita lakukan, salah satunya yaitu mengadvertise network

23.23.23.0 ke BGP pada R2.

R2(config)#router bgp 12

R2(config-router)#network 23.23.23.0 mask 255.255.255.0

Sekarang kita cek lagi di R1

R1#sh ip bgp

BGP table version is 5, local router ID is 11.11.11.11

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path

*>i3.3.3.3/32 23.23.23.3 0 100 0 3 i

*> 11.11.11.11/32 0.0.0.0 0 32768 i

*>i22.22.22.22/32 2.2.2.2 0 100 0 i

*>i23.23.23.0/24 2.2.2.2 0 100 0 i

Kita coba lakukan tes ping kembali dari R3

R3#ping 11.11.11.11

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 11.11.11.11, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 28/36/44 ms

Akhirnya berhasil reply. Sekarang kita melakukan ping dari R1.

R1#ping 3.3.3.3

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds:

.....

Success rate is 0 percent (0/5)

R3#show ip route

3.0.0.0/32 is subnetted, 1 subnets

C 3.3.3.3 is directly connected, Loopback0

11.0.0.0/32 is subnetted, 1 subnets

B 11.11.11.11 [20/0] via 23.23.23.2, 00:10:51

22.0.0.0/32 is subnetted, 1 subnets

B 22.22.22.22 [20/0] via 23.23.23.2, 00:10:51

23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C 23.23.23.0/24 is directly connected, FastEthernet0/0

L 23.23.23.3/32 is directly connected, FastEthernet0/0

Setelah kita cek ternyata hanya ip 11.11.11.11 saja, maka gunakan sebagai sourcenya.

R1#ping 3.3.3.3 source 11.11.11.11

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds:

Packet sent with a source address of 11.11.11.11

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 32/40/44 ms

Sekarang kita lakukan ping dengan cara yang sama,bisa dilakukan yaitu mengadvertise network 12.12.12.0 ke BGP pada R1.

R1(config)#router bgp 12

R1(config-router)#network 12.12.12.0 mask 255.255.255.0

Cek R3 dahulu, pastikan network 12.12.12.0 terkenali

R3#sh ip route bgp

22.0.0.0/32 is subnetted, 1 subnets

B 22.22.22.22 [20/0] via 23.23.23.2, 02:28:19

11.0.0.0/32 is subnetted, 1 subnets

B 11.11.11.11 [20/0] via 23.23.23.2, 02:28:19

12.0.0.0/24 is subnetted, 1 subnets

B 12.12.12.0 [20/0] via 23.23.23.2, 00:01:51

Setelah itu kita lakukan tes ping kembali pada R1 tanpa menggunakan source

R1(config)#do ping 3.3.3.3

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 28/35/40 ms

configsantuy

Senin, 19 Oktober 2020

LAB 3. eBGP Peering

LAB 3. eBGP Peering

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