BGP load Balancing

RouterOS Forwarding Protocols
1

Dear All,

I have CCR1036-12G-4S which will be used for multihoming bgp to connect 2 ISPs for load balancing. We have two /24 pools which will be routed through both ISP in their backbone.

170.84.28.0/24
170.84.29.0/24

Once both ISP up then 170.84.29.0/24 will route through ISP 1 and 170.84.28.0/24 will route through ISP 2. i want configure load balancing so once the ISP 1 will goes down, all traffic from 170.84.29.0/24 automatically routed to ISP 2 and vise-verse.

Please help me to provide configuration details to match our requirement. please find the attached network diagram for clear understanding.

Regards,
Mak
bgp.jpg

2

You can create prepend filters to “force” traffic from an specific Subnet to use AS1 and the other one use AS2, but still have failover.

3

I hv done some configuration which is mentioned below.

[admin@MikroTik] /routing bgp peer> print
Flags: X - disabled, E - established

INSTANCE REMOTE-ADDRESS REMOTE-AS

0 default 111.93.178.37 7018
1 default 123.63.61.190 3450

[admin@MikroTik] /routing bgp network> print
Flags: X - disabled

NETWORK SYNCHRONIZE

0 170.84.28.0/24 no
1 170.84.29.0/24 no

[admin@MikroTik] /routing filter> print
Flags: X - disabled
0 chain=BGP-OUT-AS7018 prefix=170.84.29.0/24 invert-match=no
action=passthrough set-bgp-prepend=2 set-bgp-prepend-path=1000

1 chain=BGP-OUT-AS3450 prefix=170.84.28.0/24 invert-match=no
action=passthrough set-bgp-prepend=2 set-bgp-prepend-path=1000

2 chain=BGP-OUT-AS7018 prefix=170.84.29.0/24 invert-match=no
action=passthrough set-bgp-prepend=2 set-bgp-prepend-path=1000

3 chain=BGP-OUT-AS3450 prefix=170.84.28.0/24 invert-match=no
action=passthrough set-bgp-prepend=2 set-bgp-prepend-path=1000

[admin@MikroTik] /ip firewall address-list> print
Flags: X - disabled, D - dynamic

LIST ADDRESS

0 ISP_1 170.84.28.0/24
1 ISP_2 170.84.29.0/24

[admin@MikroTik] /ip firewall mangle> print
Flags: X - disabled, I - invalid, D - dynamic
0 ;;; ISP_1
chain=prerouting action=mark-routing new-routing-mark=ISP_1_OUTBOUND
passthrough=no src-address-list=ISP_1

1 ;;; ISP_2
chain=prerouting action=mark-routing new-routing-mark=ISP_2_OUTBOUND
passthrough=no src-address-list=ISP_2

[admin@MikroTik] /ip route> print
Flags: X - disabled, A - active, D - dynamic,
C - connect, S - static, r - rip, b - bgp, o - ospf, m - mme,
B - blackhole, U - unreachable, P - prohibit

DST-ADDRESS PREF-SRC GATEWAY DISTANCE

0 S 0.0.0.0/0 123.63.61.190 20
1 S 0.0.0.0/0 123.63.61.190 1
2 S 0.0.0.0/0 111.93.178.37 20
3 A S 0.0.0.0/0 192.168.0.1 1
4 ADC 10.10.10.0/24 10.10.10.1 ether4 0
5 ADC 111.93.178.36/30 111.93.178.38 ether5 0
6 ADC 123.63.61.188/30 123.63.61.189 ether3 0
7 ADC 192.168.0.0/24 192.168.0.65 ether2 0

create mangle to mark routing and in IP routing differentiate route with AD & routing mark .


Please let me know . is this config OK.

Regards,
Mak

4

I am also searching solution for the same type of setup can you help me?