KB003: Fail to ping Gateway from the Tier-0 uplink in NSX-T

When we want to prepare the Tier-0 gateway the first step we should do is to configure the interface to communicate the physical environment and then ping to test the connection.

Symptoms

– Trying to learn MAC addresses from Tier-0 Gateway failed.

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– Trying to ping the gateway failed.

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Cause

When we configure a Edge Gateway Node, also we need to configure a NSX-T Distributed Switch which reside inside the Edge Gateway.

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But also we need to attach a external portgroup to make sure the communication with the physical environment.

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And finally create the different segments on NSX-T to connect the virtual machines. But there is only one component in the route that can tag the VLAN in a network.

In this case the segment is the component which tags the VLAN.

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But the portgroup tags the VLAN as well.

Workaround

Following the concept mention before there are tree (3) components Layer 2 when you are using Edge Gateway to communicate the physical environment;

1) Segments

2) Portgroup

3) Physical Access Swith

In this way, Portgroup and Physical Access Swith should be in trunk mode and the segment tag the VLAN.

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When we did the changes we test the MAC learning and the ping  successfully.

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Hoping you have enjoyed this post, see you next time

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