Agree. Thanks.
Page 15
term loopback
—The first order of business is to identify the switch’s loopback address and export it to all other
BGP peers. We can do this by looking at the directly connected interfaces that match a 10/24 or longer bitmask.
This quickly identifies all loopback addresses across the entire IP fabric. Because we don’t want to propagate all
of the point-to-point addresses throughout the IP fabric, we use next-hop self to change the next hop of each
advertised prefix to the egress interface of the switch. Now each switch in the IP fabric directly uses neighbor IP
addresses in the forwarding table.