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Dell SmartFabric OS10 User Guide Release 10.5.3

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Example - Routing on the host with BGP

In the following spine-leaf VLT topology, hosts and servers attach to the top-of-rack (ToR) switches with point-to-point Layer 3 interfaces. BGP with Bidirectional Forwarding Detection (BFD) is configured between the servers and ToR switches.

routing-on-the-host-uc1

Routing on the host with BGP allows the host to advertise single-host IPv4 addresses (/32 IP address) directly into the routing domain. If a server or host must be relocated, its IP address moves along with it and the route to that IP address is maintained at its new physical location.

The scalability requirement for this topology is as follows: a maximum of 128 BGP peers with 128 BFD sessions with BFD timers of 200 millisecond x 3 on the ToR switches (128; includes the sessions towards the spine and the servers).


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