Summary: Cisco Application Centric Design Guide
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6 Overview of Cisco ACI Forwarding
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6.1 VXLAN Forwarding Infrastructure
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What is the abbrevition of VXLAN?
Virtual Extensible LAN -
6.1.1 VXLAN Tunnel Endpoints
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What is a VTEP?
A VTEP is a virtual or physical device that maps end devices to VXLAN segments and performs encapsulation and decapsulation -
What kind of interfaces does the VTEP have?
-Interface on local segment used to connect end devices
-Interface on IP transport network used to encapsulate layer 2 frames into udp packets and send them over the transport network -
What is the abbreviation of PTEP?
physical tunnel endpoint -
What is the abbreviation of FTEP and for what is it used?
Fabric loopback TEP (Tunnel end point)
Used to encapsulate traffic in VXLAN to a vSwitch VTEP if present -
What does proxy TEP (PTEP)do?
Proxy TEP is an anycast address that exists across all spines and is used for forwarding lookups into the mapping database -
What control-plane protocols are running inside the fabric?
ISIS (used to maintain infrastructure reachability)
COOP (runs on on the PTEP loopback to synchronize endpoint database)
MP-BGP (run on PTEP loopback to advertise external WAN routes through the fabric)
VXLAN tunnels to PTEPs -
What is the infrastructure loopback address used for?
This address is used for communication with the APIC, for MPBGP peering, and for traceroute or ping in the infrastructure -
What is the vPC loopback VTEP address loopback address used for?
this IP address is used when the two leaf nodes forward traffic that enters through a vPC port. Traffic is forwarded by the leaf using the VXLAN encapsulation. This address is shared with the vPC peer -
What is the Fabric loopback TEP address used for?
All leaf nodes in the fabric have an IP address to communicate with the VTEP southbound (for instance, with a Cisco Application Virtual Switch [AVS]).
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