I found this note when i clean my old files, quite helpful.
Step 1. Configure IP address on a loopback interface.
Step 2. Tell BGP on each router to use the loopback ip address as source ip address .
Step 3. Configure the BGP neighbor command on each router to refer to the other router's loopback up address.
Step 4. Make sure each router has ip routes so that they can forward packets to the loopback interface IP address to the other router.
When configure loopback interface as source address, we need to configure eBGP multihop command to increase
the TTL value.
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