H3C Technologies H3C S12500-X Series Switches - Manual (Page 38)

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Configuring ENDP
Overview
Enhanced Neighbor Discovery Protocol (ENDP) dynamically discovers VTEPs and establishes VXLAN
tunnels.
Working mechanism
ENDP supports multiple VXLAN networks. ENDP uses network IDs to uniquely identify VXLANs. VTEPs
can discover each other if they have the same network ID.
ENDP uses the client/server model.
• ENDS—The enhanced neighbor discovery server collects and maintains all neighbor information
for a VXLAN network.
• ENDC—The enhanced neighbor discovery client works with the ENDS to learn neighbor
information and sets up VXLAN tunnels to the neighbors.
ENDP uses the following process to discover all VTEPs and establish VXLAN tunnels between the VTEPs:
1. The ENDCs register their IP addresses and other data with the ENDS.
2. The ENDS updates its ENDC database with received data, and then sends the updated database
to each ENDC.
3. After receiving the register reply, the ENDCs establish a VXLAN tunnel with each other.
For high availability, you can configure a maximum of two ENDSs for a VXLAN network. When you
enable ENDS on a tunnel interface, an ENDC is automatically enabled.
ENDP timers
ENDP uses an ENDS probe timer, an ENDC register timer, and a registration aging timer in neighbor
discovery.
• ENDS probe timer—Sets the interval for an ENDC to detect an ENDS. This timer is maintained on
ENDCs and is fixed at 5 seconds.
• ENDC register timer—Sets the interval for an ENDC to update its registration with an ENDS. This
timer defaults to 15 seconds and can be changed by using the vxlan neighbor-discovery client
register-interval command on ENDCs.
• Registration aging timer—This timer is five times the ENDC register timer. This timer is maintained
on ENDSs. When the registration aging timer for an ENDC expires, the ENDS removes the ENDC
from its ENDC database.
When an ENDC sends a register request to join a VXLAN network, a 5-second ENDS probe timer starts.
The ENDC sends a register request to the ENDS every 5 seconds until it receives a response from the
ENDS.
When the ENDC receives a response from the ENDS, the ENDS probe timer stops, and an ENDC
register timer starts. The ENDC regularly sends register updates at the interval set by the register timer.