A BGP Route Server is a feature designed specifically for internet exchange (IX) operators. It provides an alternative to full mesh external BGP peering among the service providers with a presence at the IX. The route server provides eBGP route reflection with customized policy support for each service provider.
In this comprehensive video guide, I explained the BGP route server, paying particular attention to its implementation on Cisco switches and routers.
Conclusion
Other resources:
IP Routing: BGP Configuration Guide.
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For comprehensive content, you can refer to my Cisco Data Centers | MP-BGP Udemy course.