BGP IPv4 Table
Figure 2.111 shows the remote AS300 addresses learned from ASBR-200 (166.50.10.1) that have been installed into the BGP IPv4 table. For RR-200 to form an eBGP peering relationship with RR-300 it must first learn RR-300’s loopback address (156.50.10.4), which it does via iBGP + IPv4 + Label from ASBR-200
Figure 2.111 BGP IPv4 Entries on RR-200
Since ASBR-200 also passed the label for 156.50.10.4, as shown in Figure 2.112, it can set up the appropriate label stack {16 23} to form the eBGP peering.
Figure 2.112 Label for RR-300 ...
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