Configure EBGP on R3 and R4 as follows:
■ Configure EBGP between R3 and R4.
■ The neighbor on backbone segment 2 has an IP address of 18.104.22.168 and is in Autonomous System 2554.
■ Configure EBGP between R4 and the external lab router on backbone segment 2.
■ Permit only the registered address space as defined in the appropriate RFC as allowed networks from any EBGP-defined routers.
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