BGP IP Solution for Network redundancy

[Bryan Lee]

Hi,

We are planning to have BGP IP solution with 4 ISP links for our infrastructure for maximum 100% availablity of network .

We have two 2921 rouetrs connected to ISP. each router has two ISP connected also for VPN connectivity we have two 5510 ASA connected to ISP routers.

Please refer attached diagram for more detail

Can someone help me to setup this configuration coz I am very much new in BGP

Thanks in advance

[Haris P]

Dear Anil ,

please refer the diagram.

For better BW utilization & to reduce complexitty , I prefer to connect only 1 link to each ISP.

Do you own PI IP address ?

Regards

[Bryan Lee]

Thanks Haris

shortly we will be having our own AS .

so as per network dig. which you provided we shoule get 100% redundancy.

could you please provide us any sample configuration?

[Haris P]

Dear Anil ,

See the sample config. for Router R1 and Router R2 . R1 is connected to ISP1 and R2 is connected to ISP2 . Only 1 link is connected to both ISP'1. 2 link to each ISP's will be complicated

R1 (loopback ip : 1.1.1.1) and 192.168.0.21 is the IP for ISP1

router bgp 45455
network 192.168.1.0 mask 255.255.255.128
network 192.168.1.0 mask 255.255.255.0
neighbor 2.2.2.2 remote-as 45455
neighbor 2.2.2.2 soft-reconfiguration inbound
neighbor 2.2.2.2 next-hop-self

neighbor 192.168.0.21 remote-as 8854
neighbor 192.168.0.21 soft-reconfiguration inbound
neighbor 192.168.0.21 prefix-list ISP1 out

ip prefix-list ISP1 seq 10 permit 192.168.1.0/24
ip prefix-list ISP1 seq 10 permit 192.168.1.0/25

R2 (loopback ip : 2.2.2.2) and 192.168.0.55 is the IP for ISP2

router bgp 45455
network 192.168.1.128 mask 255.255.255.128
network 192.168.1.0 mask 255.255.255.0
neighbor 1.1.1.1 remote-as 45455
neighbor 1.1.1.1 soft-reconfiguration inbound
neighbor 1.1.1.1 next-hop-self

neighbor 192.168.0.55 remote-as 8855
neighbor 192.168.0.55 soft-reconfiguration inbound
neighbor 192.168.0.55 prefix-list ISP2 out

ip prefix-list ISP2 seq 10 permit 192.168.1.128/24
ip prefix-list ISP2 seq 10 permit 192.168.1.0/25

Please rate this post if it helps

Regards

[Bryan Lee]

Thanks Haris for help