H3C Router - BGP single router with 2 different AS number

This is one of the example using H3C router to peer with 2 Autonomous System number a.k.a 2 different ISP.

The diagram as below.

Router A connect to 2 different ISP. ISP A and ISP B. Internal network that advertised to bgp is 192.168.0.0 / 21. This is the example of router received full internet route and have to do the filtering in order to avoid the Router A become a transit router in the network.

[Router A]dis cu
#
 version 5.20, Release 2420P03
#
 sysname Router A
#
 domain default enable system
#
domain system
 access-limit disable
 state active
 idle-cut disable
 self-service-url disable
#
user-group system
#
interface Serial1/0
 link-protocol ppp
#
interface Serial1/1
 link-protocol ppp
#
interface NULL0
#
interface GigabitEthernet0/0
#
interface GigabitEthernet0/1
#
interface GigabitEthernet0/2
#
interface GigabitEthernet0/3
#
bgp 10
 router-id 1.1.1.1
 network 192.168.0.0 255.255.248.0
 undo synchronization
 peer 10.10.10.10 as-number 20
 peer 20.20.20.20 as-number 30
 group 20 external
 peer 10.10.10.10 group 20
 peer 10.10.10.10 description Connection to ISP-A
 peer 10.10.10.10 route-policy ISP-A-outbound export
 peer 10.10.10.10 route-policy ISP-A-inbound import
 group 30 external
 peer 20.20.20.20 group 30
 peer 20.20.20.20 description Coonection to ISP-B
 peer 20.20.20.20 route-policy ISP-B-outbound export
 peer 20.20.20.20 route-policy ISP-B-inbound import
#
route-policy ISP-B-outbound permit node 10
 if-match ip-prefix Company-A
route-policy ISP-A-inbound permit node 10
 if-match as-path 20
 apply cost 100
route-policy ISP-B-inbound permit node 10
 if-match as-path 30
route-policy ISP-A-outbound permit node 10
 if-match ip-prefix Company-A
#
 ip ip-prefix Company-A index 10 permit 192.168.0.0 21
#
 ip as-path 20 permit ^20_
 ip as-path 30 permit ^30_
#
 ip route-static 0.0.0.0 0.0.0.0 10.10.10.10
 ip route-static 0.0.0.0 0.0.0.0 20.20.20.20
 ip route-static 192.168.0.0 255.255.248.0 NULL0
#              
user-interface con 0
user-interface aux 0
user-interface vty 0 4
#
return
[Router A]