Lab.11 BGP Weight
konfigurasi dasar
R1
R1(config)#int g1/0
R1(config-if)#ip add 12.12.12.1 255.255.255.0
R1(config-if)#no sh
R1(config)#int g2/0
R1(config-if)#ip add 13.13.13.1 255.255.255.0
R1(config-if)#no sh
R1(config)#int lo0
R1(config-if)#ip add 1.1.1.1 255.255.255.255
R1(config-if)#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 1.1.1.1 mask 255.255.255.255
R2
R2(config)#int g2/0
R2(config-if)#ip add 12.12.12.2 255.255.255.0
R2(config-if)#no sh
R2(config-if)#int f0/0
R2(config-if)#ip add 23.23.23.2 255.255.255.0
R2(config-if)#no sh
R2(config-if)#int g1/0
R2(config-if)#ip add 24.24.24.2 255.255.255.0
R2(config-if)#no sh
R2(config)#int lo0
R2(config-if)#ip add 2.2.2.2 255.255.255.255
R2(config-if)#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)#neighbor 24.24.24.4 remote-as 4
R2(config-router)#net 2.2.2.2 mask 255.255.255.25
R2(config-router)#neighbor 23.23.23.3 next-hop-self
R3
R3(config)#int g1/0
R3(config-if)#ip add 13.13.13.3 255.255.255.0
R3(config-if)#no sh
R3(config)#int f0/0
R3(config-if)#ip add 23.23.23.3 255.255.255.0
R3(config-if)#no sh
R3(config-if)#exit
R3(config)#int g2/0
R3(config-if)#ip add 34.34.34.3 255.255.255.0
R3(config-if)#no sh
R3(config)#router bgp 23
R3(config-router)#neighbor 13.13.13.1 remote-as 1
R3(config-router)#neighbor 23.23.23.2 remote-as 23
R3(config-router)#neighbor 34.34.34.4 remote-as 4
R3(config-router)#neighbor 23.23.23.2 next-hop-self
R4
R4(config)#int g1/0
R4(config-if)#ip add 24.24.24.4 255.255.255.0
R4(config-if)#no sh
R4(config)#int g2/0
R4(config-if)#ip add 34.34.34.4 255.255.255.0
R4(config-if)#no sh
R4(config)#int lo0
R4(config-if)#ip add 4.4.4.4 255.255.255.255
R4(config)#router bgp 4
R4(config-router)#neighbor 24.24.24.2 remote-as 23
R4(config-router)#neighbor 34.34.34.3 remote-as 23s
R4(config-router)#net 4.4.4.4 mask 255.255.255.255
kita verifikasi
R1
R1(config)#do show ip bgp
Network Next Hop Metric LocPrf Weight Path
*> 1.1.1.1/32 0.0.0.0 0 32768 i
* 2.2.2.2/32 13.13.13.3 0 23 i
*> 12.12.12.2 0 0 23 i
* 4.4.4.4/32 13.13.13.3 0 23 4 i
*> 12.12.12.2 0 23 4 i
R1
R1(config)#int g1/0
R1(config-if)#sh
R1
R1(config)#do sh ip bgp
Network Next Hop Metric LocPrf Weight Path
*> 1.1.1.1/32 0.0.0.0 0 32768 i
*> 4.4.4.4/32 13.13.13.3 0 23 4 i
R1
R1(config)#do show ip route bgp
4.0.0.0/32 is subnetted, 1 subnets
B 4.4.4.4 [20/0] via 13.13.13.3, 00:03:06
Saat ini linknya sudah berpindah melalui R3. Kemudian, kita tes kembali
dengan cara kita no shutdown pada port yang menuju ke R2.
R1
R1(config)#int g1/0
R1(config-if)#no sh
R1
R1#sh ip bgp
BGP table version is 5, local router ID is 1.1.1.1
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
*> 1.1.1.1/32 0.0.0.0 0 32768 i
* 4.4.4.4/32 12.12.12.2 0 23 4 i
*> 13.13.13.3 0 23 4 i
R1
R1#sh ip route bgp
4.0.0.0/32 is subnetted, 1 subnets
B 4.4.4.4 [20/0] via 13.13.13.3, 00:32:17
kita konfigurasikan attribute weight
R1
R1(config)#route-map WEIGHT
R1(config-route-map)#set weight 100
R1(config-route-map)#ex
R1(config)#router bgp 1
R1(config-router)#neighbor 12.12.12.2 route-map WEIGHT in
R1(config-router)#ex
R1(config)#do clear ip bgp *
R1
R1#sh ip bgp
BGP table version is 3, local router ID is 1.1.1.1
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
*> 1.1.1.1/32 0.0.0.0 0 32768 i
*> 4.4.4.4/32 12.12.12.2 100 23 4 i
* 13.13.13.3 0 23 4 i
R1
R1#sh ip route bgp
4.0.0.0/32 is subnetted, 1 subnets
B 4.4.4.4 [20/0] via 12.12.12.2, 00:02:09
kita tes lagi shutdown interface ke R2.
R1
R1(config)#int g1/0
R1(config-if)#sh
R1
R1(config)#do sh ip bgp
BGP table version is 4, local router ID is 1.1.1.1
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
*> 1.1.1.1/32 0.0.0.0 0 32768 i
*> 4.4.4.4/32 13.13.13.3 0 23 4 i
R1
R1(config)#do sh ip route bgp
4.0.0.0/32 is subnetted, 1 subnets
B 4.4.4.4 [20/0] via 12.12.12.2, 00:00:02
kita juga bisa mengatur trafik yang dating dengan menggunakan (MED)
R1
R1(config)#router bgp 1
R1(config-router)#ip access-list standard LAN
R1(config-std-nacl)#permit 1.1.1.1
R1(config-std-nacl)#route-map R2MED permit 10
R1(config-route-map)#match ip address LAN
R1(config-route-map)#set metric 110
R1(config)#router bgp 1
R1(config-router)#neighbor 12.12.12.2 route-map R2MED out
R1(config-router)#neighbor 13.13.13.3 route-map R3MED out
kita verifikasi
R3
R3#sh ip route 1.1.1.1
Routing entry for 1.1.1.1/32
Known via "bgp 23", distance 20, metric 100
Tag 1, type external
Last update from 13.13.13.1 00:00:10 ago
Routing Descriptor Blocks:
* 13.13.13.1, from 13.13.13.1, 00:00:10 ago
Route metric is 100, traffic share count is 1
AS Hops 1
Route tag 1
R2
R2(config)#do show ip bgp 1.1.1.1
BGP routing table entry for 1.1.1.1/32, version 23
Paths: (2 available, best #1, table Default-IP-Routing-Table)
Advertised to update-groups:
3
1
23.23.23.3 from 23.23.23.3 (34.34.34.3)
Origin IGP, metric 100, localpref 100, valid, internal, best
1
12.12.12.1 from 12.12.12.1 (1.1.1.1)
Origin IGP, metric 110, localpref 100, valid, external
R2
R2(config)#do show ip bgp
BGP table version is 24, local router ID is 2.2.2.2
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
*>i1.1.1.1/32 23.23.23.3 100 100 0 1 i
* 12.12.12.1 110 0 1 i
*> 2.2.2.2/32 0.0.0.0 0 32768 i
* i4.4.4.4/32 23.23.23.3 0 100 0 4 i
*> 24.24.24.4 0 0 4 i
R2
R2#traceroute 1.1.1.1 source 2.2.2.2
Type escape sequence to abort.
Tracing the route to 1.1.1.1
1 23.23.23.3 20 msec 20 msec 8 msec
2 13.13.13.1 28 msec 24 msec 8 msec
Seperti yang kita lihat diatas, maka dari R2 (AS 23) untuk menuju ke R1 (AS 1)
akan melalui R3 terlebih dahulu.
Terlebih dahulu kita hapus konfigurasi MED sebelumnya.
R1
R1(config)#router bgp 1
R1(config-router)#no neighbor 12.12.12.2 route-map R2MED out
R1(config-router)#no neighbor 13.13.13.3 route-map R3MED out
Kita mengkonfigurasikan AS-Path
R1
R1(config)#router bgp 1
R1(config-router)#neighbor 12.12.12.2 route-map AS-PREPEND out
R1(config-router)#route-map AS-PREPEND
R1(config-route-map)#set as-path prepend 1 1 1
R1(config-route-map)#do clear ip bgp
Sekarang kita verifikasi
R2
R2#sh ip bgp
BGP table version is 29, local router ID is 2.2.2.2
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
*>i1.1.1.1/32 23.23.23.3 0 100 0 1 i
* 12.12.12.1 0 0 1 1 1 1 i
*> 2.2.2.2/32 0.0.0.0 0 32768 i
* i4.4.4.4/32 23.23.23.3 0 100 0 4 i
*> 24.24.24.4 0 0 4 i
R2
R2#sh ip route bgp
1.0.0.0/32 is subnetted, 1 subnets
B 1.1.1.1 [200/0] via 23.23.23.3, 00:05:20
4.0.0.0/32 is subnetted, 1 subnets
B 4.4.4.4 [20/0] via 24.24.24.4, 02:23:15
R2
R2#traceroute 1.1.1.1 source 2.2.2.2
Tracing the route to 1.1.1.1
1 23.23.23.3 20 msec 20 msec 24 msec
2 13.13.13.1 20 msec 24 msec 12 msec
R3
R3#sh ip bgp
BGP table version is 18, local router ID is 34.34.34.3
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
*> 1.1.1.1/32 13.13.13.1 0 0 1 i
*>i2.2.2.2/32 23.23.23.2 0 100 0 i
* i4.4.4.4/32 23.23.23.2 0 100 0 4 i
*> 34.34.34.4 0 0 4 i
R4
R4#sh ip bgp
BGP table version is 13, local router ID is 4.4.4.4
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
* 1.1.1.1/32 34.34.34.3 0 23 1 i
*> 24.24.24.2 0 23 1 i
* 2.2.2.2/32 34.34.34.3 0 23 i
*> 24.24.24.2 0 0 23 i
*> 4.4.4.4/32 0.0.0.0 0 32768 i
R4
R4#trace 1.1.1.1 source 4.4.4.4
Type escape sequence to abort.
Tracing the route to 1.1.1.1
1 24.24.24.2 8 msec 24 msec 20 msec
2 23.23.23.3 16 msec 20 msec 20 msec
3 13.13.13.1 44 msec 48 msec 32 msec
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