Juniper J2300 User Manual page 314

J-series™ Services Router User Guide
Figure 74: BGP Confederations
Sub-AS 65300
Figure 74 shows AS 3 divided into four sub-ASs, 64517, 64550, 65300, and
65410, which are linked through EBGP sessions. Because the confederations
are connected by EBGP, they do not need to be fully meshed. EBGP
routes are readvertised to other sub-ASs.
284
BGP Overview
AS 3
Sub-AS 64517 Sub-AS 64550
IBGP
EBGP
IBGP
Sub-AS 65410