Lab 12 BGP Multihoming ISP Beda load balance
Hapus terlebih dahulu config bgp dari lab sebelumnya ( bikin bgp baru )
R1
R1(config)#router bgp 1
R1(config-router)#
R1(config-router)#net 1.1.1.1 mask 255.255.255.255
R1(config-router)#neighbor 12.12.12.2 remote-as 2
R1(config-router)#neighbor 13.13.13.3 remote-as 3
R1(config-router)#maximum-paths 2
R2
R2(config)#router bgp 2
R2(config-router)#neighbor 12.12.12.1 remote-as 1
R2(config-router)#
R2(config-router)#neighbor 24.24.24.4 remote-as 4
R3
R3(config)#router bgp 3
R3(config-router)#neighbor 13.13.13.1 remote-as 1
R3(config-router)#neighbor 34.34.34.4 remote-as 4
R4
R4(config)#router bgp 4
R4(config-router)#net 4.4.4.4 mask 255.255.255.255
R4(config-router)#neighbor 24.24.24.2 remote-as 2
R4(config-router)#neighbor 34.34.34.3 remote-as 3
Coba kita cek terlebih dahulu
R1
R1#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 12.12.12.2 0 2 4 i
* 13.13.13.3 0 3 4 i
R1
R1#sh ip route 4.4.4.4
Routing entry for 4.4.4.4/32
Known via "bgp 1", distance 20, metric 0
Tag 2, type external
Last update from 12.12.12.2 00:09:09 ago
Routing Descriptor Blocks:
* 12.12.12.2, from 12.12.12.2, 00:09:09 ago
Route metric is 0, traffic share count is 1
AS Hops 2
Route tag 2
R1
R1#traceroute 4.4.4.4 source 1.1.1.1
Type escape sequence to abort.
Tracing the route to 4.4.4.4
1 12.12.12.2 4 msec 40 msec 8 msec
2 24.24.24.4 56 msec 44 msec 32 msec
Supaya bisa load sharing melalui 2 ISP
R1
R1(config)#router bgp 1
R1(config-router)#bgp bestpath as-path multipath-relax
R1(config-router)#do clear ip bgp *
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
* 4.4.4.4/32 13.13.13.3 0 3 4 i
*> 12.12.12.2 0 2 4 i
R1
R1(config)#do show ip route 4.4.4.4
Routing entry for 4.4.4.4/32
Known via "bgp 1", distance 20, metric 0
Tag 2, type external
Last update from 12.12.12.2 00:06:26 ago
Routing Descriptor Blocks:
* 13.13.13.3, from 13.13.13.3, 00:06:26 ago
Route metric is 0, traffic share count is 1
AS Hops 2
Route tag 2
12.12.12.2, from 12.12.12.2, 00:06:26 ago
Route metric is 0, traffic share count is 1
AS Hops 2
Route tag 2
R1
R1#traceroute 4.4.4.4 source 1.1.1.1
Type escape sequence to abort.
Tracing the route to 4.4.4.4
1 12.12.12.2 40 msec
13.13.13.3 28 msec
12.12.12.2 20 msec
2 34.34.34.4 40 msec
24.24.24.4 32 msec
34.34.34.4 44 msec
sudah load sharing tapi beda link, caranya d bawah ini
R1
R1(config)#int g1/0
R1(config-if)#bandwidth 1000
R1(config-if)#int g2/0
R1(config-if)#bandwidth 2000
R1(config-if)#do clear ip bgp
cek lagi
R1
R1(config)#do show ip route 4.4.4.4
Routing entry for 4.4.4.4/32
Known via "bgp 1", distance 20, metric 0
Tag 2, type external
Last update from 12.12.12.2 00:25:22 ago
Routing Descriptor Blocks:
* 13.13.13.3, from 13.13.13.3, 00:25:22 ago
Route metric is 0, traffic share count is 1
AS Hops 2
Route tag 2
12.12.12.2, from 12.12.12.2, 00:25:22 ago
Route metric is 0, traffic share count is 1
AS Hops 2
Route tag 2
Ternyata masih 1:1 padahal bandwidthnya berbeda.
kita konfigurasikan seperti di bawah ini
R1
R1(config)#router bgp 1
R1(config-router)#bgp dmzlink-bw
R1(config-router)#neighbor 12.12.12.2 dmzlink-bw
R1(config-router)#neighbor 13.13.13.3 dmzlink-bw
R1(config-router)#do clear ip bgp * soft
R1
R1(config)#do show ip bgp
BGP table version is 6, 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 3 4 i
*> 12.12.12.2 0 2 4 i
R1
R1(config)#do show ip route 4.4.4.4
Routing entry for 4.4.4.4/32
Known via "bgp 1", distance 20, metric 0
Tag 2, type external
Last update from 12.12.12.2 00:18:51 ago
Routing Descriptor Blocks:
* 13.13.13.3, from 13.13.13.3, 00:18:51 ago
Route metric is 0, traffic share count is 2
AS Hops 2
Route tag 2
12.12.12.2, from 12.12.12.2, 00:18:51 ago
Route metric is 0, traffic share count is 1
AS Hops 2
Route tag 2
R1
R1#traceroute 4.4.4.4 source 1.1.1.1
Type escape sequence to abort.
Tracing the route to 4.4.4.4
1 12.12.12.2 56 msec
13.13.13.3 40 msec 24 msec
2 24.24.24.4 36 msec
34.34.34.4 32 msec 36 msec
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