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Distributed VXLAN gateway with BGP EVPN mode

Created: Apr 10, 2020 09:50:28Latest reply: Apr 10, 2020 09:50:47 56 1 0 0
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Hello everyone,

Recently, I am learning EVPN. After reading the product documentation, I still have some questions.  A distributed VXLAN gateway is deployed in BGP EVPN mode, and a Layer 3 VNI is specified for the L3VPN instance. What are the functions of a VNI? 

Why cannot a VNI be the same as a VNI in a BD?

Can multiple VNIs be configured for a BD?

Please help me! Thank you!

ip vpn-instance vpn1

ipv4-family

route-distinguisher 11:11

vpn-target 11:1 export-extcommunity evpn

vpn-target 11:1 import-extcommunity evpn

vxlan vni 5010

# bridge-domain 10

vxlan vni 10

evpn route-distinguisher 10:1

vpn-target 10:1 export-extcommunity

vpn-target 11:1 export-extcommunity

vpn-target 10:1 import-extcommunity


  • x
  • convention:

Featured Answers
Admin Created Apr 10, 2020 09:50:47 Helpful(0) Helpful(0)

Hi WDNJSQ,
Q1: The RT is used by the peer to learn the routes advertised by the local end and belongs to the control plane. VXLAN is used to encapsulate data during data forwarding. In this case, the data does not have RT values. How does the peer end identify and forward the data? That is, check the VNI value in the VXLAN header.
Q2: Why cannot they be the same? When the peer end receives the data, it finds that the VNI value is the VNI value of the BD domain and forwards the data to the BD domain (through Layer 2 forwarding). If the VNI value is the Layer 3 VNI value, the peer end forwards the data to the corresponding VPN instance for Layer 3 routing. If Layer 2 and Layer 3 are the same, they cannot be distinguished.
Q3: One BD is bound to one VNI.
I hope it helps!
View more
  • x
  • convention:

All Answers
DDSN Admin Created Apr 10, 2020 09:50:47 Helpful(0) Helpful(0)

Hi WDNJSQ,
Q1: The RT is used by the peer to learn the routes advertised by the local end and belongs to the control plane. VXLAN is used to encapsulate data during data forwarding. In this case, the data does not have RT values. How does the peer end identify and forward the data? That is, check the VNI value in the VXLAN header.
Q2: Why cannot they be the same? When the peer end receives the data, it finds that the VNI value is the VNI value of the BD domain and forwards the data to the BD domain (through Layer 2 forwarding). If the VNI value is the Layer 3 VNI value, the peer end forwards the data to the corresponding VPN instance for Layer 3 routing. If Layer 2 and Layer 3 are the same, they cannot be distinguished.
Q3: One BD is bound to one VNI.
I hope it helps!
View more
  • x
  • convention:

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