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Clarify how addresses are propagated

This commit is contained in:
freddygv 2022-10-21 15:50:49 -06:00
parent b9fa83b72b
commit ca9df9c851
1 changed files with 6 additions and 4 deletions
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10
website/content/docs/connect/gateways/mesh-gateway/wan-federation-via-mesh-gateways.mdx
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@ -187,10 +187,12 @@ expected result:
### Upgrading the primary gateways
Once federation has been established, updates for the addresses of new primary
gateways are propagated through the gateways in the primary themselves. If the primary
gateways are upgraded, and their previous instances are decommissioned before
the updates are propagated, then the primary datacenter will become unreachable.
Once federation is established, secondary datacenters will continuously request
updated mesh gateway addresses from the primary datacenter. These requests
themselves flow through the mesh gateways of the primary datacenter, since
secondary datacenters cannot dial the primary datacenter's Consul servers directly.
If the primary gateways are upgraded, and their previous instances are decommissioned
before the updates are propagated, then the primary datacenter will become unreachable.
To safely upgrade primary gateways, we recommend that you apply one of the following policies:
- Avoid decommissioning primary gateway IP addresses. This is because the [primary_gateways](/docs/agent/config/config-files#primary_gateways) addresses configured on the secondary servers act as a fallback mechanism for re-establishing connectivity to the primary.