![]() ![]() A loopback interface will never go down unless the router crashes or when you “shut” it. Why?Ī physical interface can go down, which means the IP address on the interface is no longer reachable. We will use the loopback interface as the source for our BGP session. When there are multiple paths, it’s better to use a loopback interface with an IP address and to advertise that into your IGP. What if we had multiple paths between R2 and R4? So, which IP addresses will we select? In this particular scenario, it really doesn’t matter since there is only 1 path between R2 and R4. That’s why we need an IGP like we talked about earlier. I can use any of these IP addresses, but we need connectivity. Interface IP-Address OK? Method Status ProtocolįastEthernet0/0 192.168.12.2 YES NVRAM up upįastEthernet1/0 192.168.23.2 YES NVRAM up up R4# show ip interface briefįastEthernet0/0 192.168.34.4 YES NVRAM up upįastEthernet1/0 192.168.45.4 YES NVRAM up up Our next step will be to configure IBGP between R2 and R4…what IP addresses are we going to use for this? Let’s look at our options: R2# show ip interface brief I am also advertising a prefix (on a loopback interface) in BGP: R1(config)# interface loopback 0 Configurationįirst, we’ll configure R1 and R2. We’ll start with BGP between R1/R2, R2/R4, and R4/5 as I just described. Let’s get our hands dirty with some configuration.
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