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Border Gateway Protocol ( BGP Confederation ) on Mikrotik

Otodidak learner - Previously we have learned about the route reflector which we can use to solve problems on the IBGP full mesh topology Peering....

Border Gateway Protocol ( Route Reflector ) On Mikrotik

Almost same with Border Gateway Protocol ( BGP Backdoor ) then we have to configure Full Mesh Peering. It certainly would be a problem if we have 100 IBGP router, full mesh peering network would be very burdensome.

To overcome these problems, we can configure the route reflector, so that each router IBGP only need to do peering with the route reflector. The following topology which we will use

First, we configure the IP address of the entire router

[admin@MikroTik] > system identity set name=R1

[admin@R1] > interface bridge add name=lo0
[admin@R1] > ip address
[admin@R1] /ip address> add address=22.22.22.1/24 interface=ether1
[admin@R1] /ip address> add address=192.168.0.1/24 interface=lo0

[admin@MikroTik] > system identity set name=R2
[admin@R2] > interface bridge add name=lo0
[admin@R2] > ip address
[admin@R2] /ip address> add address=22.22.22.2/24 interface=ether1
[admin@R2] /ip address> add address=23.23.23.2/24 interface=ether2
[admin@R2] /ip address> add address=192.168.1.1/24 interface=lo0

[admin@MikroTik] > system identity set name=R3
[admin@R3] > interface bridge add name=lo0
[admin@R3] > ip address
[admin@R3] /ip address> add address=23.23.23.3/24 interface=ether1
[admin@R3] /ip address> add address=192.168.3.1/24 interface=lo0

Next we try to create IBGP peering at R1, R2, and R3,

[admin@R1] /ip address> /routing bgp
[admin@R1] /routing bgp> instance set 0 as=123
[admin@R1] /routing bgp> peer add remote-address=22.22.22.2 remote-as=123
[admin@R1] /routing bgp> network add network=192.168.0.0/24

[admin@R2] /ip address> /routing bgp
[admin@R2] /routing bgp> instance set 0 as=123
[admin@R2] /routing bgp> peer add remote-address=22.22.22.1 remote-as=123 route-reflect=yes
[admin@R2] /routing bgp> peer add remote-address=23.23.23.3 remote-as=123 route-reflect=yes
[admin@R2] /routing bgp> network add network=192.168.1.0/24

[admin@R3] /ip address> /routing bgp
[admin@R3] /routing bgp> instance set 0 as=123
[admin@R3] /routing bgp> peer add remote-address=23.23.23.2 remote-as=123
[admin@R3] /routing bgp> network add network=192.168.2.0/24

Note that we configure the router R2 as a reflector (parameter route-reflect = yes). next to the test, we look at the routing table on R1

[admin@R1] /routing bgp> /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 ADC 22.22.22.0/24 22.22.22.1 ether1 0
1 A S 23.23.23.0/24 22.22.22.2 1
2 ADC 192.168.0.0/24 192.168.0.1 lo0 0
3 ADb 192.168.1.0/24 22.22.22.2 200
4 ADb 192.168.3.0/24 23.23.23.3 200

z 6:24 PM Admin Bandung Indonesia

Border Gateway Protocol ( Route Reflector ) On Mikrotik

Border Gateway Protocol ( Route Reflector ) On Mikrotik Almost same with Border Gateway Protocol ( BGP Backdoor ) then we have to configure Full...

After we learned , External Border Gateway Protocol (EBGP Peering Physical Interface) On Mikrotik We will learn about BGP Backdoor. BGP Backdoor is a technique for manipulating the selection between best path routing protocol EBGP with IGP routing protocols such as OSPF, EIGRP, etc.

Border Gateway Protocol ( BGP Backdoor )

By default, the value of AD EBGP is 20, EBGP certainly would be an advantage compared with IGP protocols such as OSPF, EIGRP, etc.. With BGP Backdoor, we can manipulate so IGP routing protocol takes precedence over EBGP

We will configure BGP Peering between R1 to R3 and R2 to R3. While the link between R1 and R2, we will only configure OSPF

R1(config)#int e0/0

R1(config-if)#no sh R1(config-if)#ip add 12.12.12.1 255.255.255.0
R1(config-if)#int e0/1 R1(config-if)#no sh
R1(config-if)#ip add 13.13.13.1 255.255.255.0
R1(config-if)#int l0 R1(config-if)#ip add 1.1.1.1 255.255.255.255
R1(config-if)#router bgp 1
R1(config-router)#nei 13.13.13.3 remote-as 3
R1(config-router)#net 1.1.1.1 mask 255.255.255.255
R1(config-router)#router ospf 1
R1(config-router)#net 12.12.12.0 0.0.0.255 are 0
R1(config-router)#net 1.1.1.1 0.0.0.0 are 0

R2(config)#int e0/0
R2(config-if)#no sh
R2(config-if)#ip add 12.12.12.2 255.255.255.0
R2(config-if)#int e0/1 R2(config-if)#no sh
R2(config-if)#ip add 23.23.23.2 255.255.255.0
R2(config-if)#router bgp 2
R2(config-router)#nei 23.23.23.3 remote-as 3
R2(config-router)#router ospf 1
R2(config-router)#net 12.12.12.0 0.0.0.255 are 0

R3(config)#int e0/0
R3(config-if)#no sh
R3(config-if)#ip add 13.13.13.3 255.255.255.0
R3(config-if)#int e0/1 R3(config-if)#no sh
R3(config-if)#ip add 23.23.23.3 255.255.255.0
R3(config-if)#router bgp 3
R3(config-router)#nei 13.13.13.1 remote-as 1
R3(config-router)#nei 23.23.23.2 rempte-as 2

Now we check the routing table on R2

R2(config-router)#do sh ip ro
1.0.0.0/32 is subnetted, 1 subnets
B 1.1.1.1 [20/0] via 23.23.23.3, 00:06:15
12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 12.12.12.0/24 is directly connected, Ethernet0/0
23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 23.23.23.0/24 is directly connected, Ethernet0/1

[Note]: R2 prefer to use EBGP routing protocol to heading 1.1.1.1 than OSPF. And if using BGP, R2 R3 must pass first. Whereas if you use OSPF, should R2 can go straight to R1. Why R2 can choose BGP than OSPF ?? because the value of AD BGP is 20 while the value of OSPF is 110 AD.
In order R2 prefer use OSPF routing protocol, we can configure BGP Backdoor

R2(config)#router bgp 2

R2(config-router)#net 1.1.1.1 mask 255.255.255.255 backdoor

Now we check the routing table on R2

R2(config-router)#do sh ip ro
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/11] via 12.12.12.1, 00:00:06, Ethernet0/0
12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks C
12.12.12.0/24 is directly connected, Ethernet0/0
23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks C
23.23.23.0/24 is directly connected, Ethernet0/1

Note that at this time has chosen R2 using OSPF routing protocol BGP compared to heading 1.1.1.1 z 5:51 PM Admin Bandung Indonesia