What is the VNI in the EVPN distributed gateway L3VPN used for

Created: Nov 29, 2019 14:20:43Latest reply: Dec 16, 2019 12:06:14 140 3 0 0
  Rewarded Hi-coins: 0 (problem resolved)

Hi,

I read the documentation but cannot get myself clear about the VNI in the EVPN distributed gateway L3VPN.

If it's used to distinguish the private network of the users, the RT and RD could be enough, what's more, the VNI cannot be the same with the VNI of the BD domain. Can anyone help to explain that? Thanks!

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
chenhui
Admin Created Nov 29, 2019 14:27:32 Helpful(0) Helpful(0)

@user_3445655 hello,
first of all, the layer 3 VNI is a very important thing.
you might ignore the affect of the VNI during the routing information spreading. But when the packets forwarding, it will be encapsulated by the vxlan, the remote peer VNI will be contained so that it could be forwarded to the correct vpn instance based on the encapsulated VNI. After that, the packet are forwarded in the vpn instance.
for the second question, when the packets arrived, if the VNI matches the BD domain VNI, it will be transferred to the BD domain(this is a layer 2 forwarding). If it matches the layer 3 VNI, it will be transferred into the vpn instance. So, if the VNI is same with the BD domain VNI, the router cannot distiguish them from each other.
  • x
  • convention:

All Answers
chenhui
chenhui Admin Created Nov 29, 2019 14:27:32 Helpful(0) Helpful(0)

@user_3445655 hello,
first of all, the layer 3 VNI is a very important thing.
you might ignore the affect of the VNI during the routing information spreading. But when the packets forwarding, it will be encapsulated by the vxlan, the remote peer VNI will be contained so that it could be forwarded to the correct vpn instance based on the encapsulated VNI. After that, the packet are forwarded in the vpn instance.
for the second question, when the packets arrived, if the VNI matches the BD domain VNI, it will be transferred to the BD domain(this is a layer 2 forwarding). If it matches the layer 3 VNI, it will be transferred into the vpn instance. So, if the VNI is same with the BD domain VNI, the router cannot distiguish them from each other.
  • x
  • convention:

user_3445655
user_3445655 Created Dec 2, 2019 06:20:36 Helpful(0) Helpful(0)

Posted by chenhui at 2019-11-29 14:27 @user_3445655 hello,first of all, the layer 3 VNI is a very important thing.you might ignore the aff ...
thanks dear.
  • x
  • convention:

chenhui
chenhui Admin Created Dec 16, 2019 12:06:14 Helpful(0) Helpful(0)

You are welcome. :D
  • x
  • convention:

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