Expressroute to on-Prem with BGP

Lau, Donald 1 Reputation point
2022-04-06T13:46:50.87+00:00

We have a new setup of expressroute to our on-prem network via Telco carrier.
The BGP connection between on-prem to telco was established.
We have defined the Virtual Network Gateway (w/ virtual subnet) on Azure and connected to expressroute instance. However, we found the expressroute circuit cannot display the "Peer ARP in ARP Table" and "Peer IP in route table" in Azure private setting. In "Route table summary", it was show the neighbor IP state is "Active" but the up/down is "never". The AS, subnet and vlan ID is provided by Telco and inputed correctly.

Azure ExpressRoute
Azure ExpressRoute
An Azure service that provides private connections between Azure datacenters and infrastructure, either on premises or in a colocation environment.
373 questions
0 comments

1 answer

Sort by: Most helpful
Most helpful Newest Oldest
  1. ChaitanyaNaykodi-MSFT 26,101 Reputation points Microsoft Employee
    2022-04-07T21:38:49.9+00:00

    Hello @Lau, Donald ,

    ARP issue might arise due to Layer 2 configuration. Can you follow the troubleshooting documentation here and determine if there are any Layer 2 configuration issues? If the provider's MAC address has issues. Open a support request with your connectivity provider to debug such issues.

    1 person found this answer helpful.
    0 comments

Your answer

Answers can be marked as Accepted Answers by the question author, which helps users to know the answer solved the author's problem.