This is an original planning guide. It is not a vendor manual, an official standard, or legal advice. Example addresses use documentation ranges. Review every command before you paste it.
What this hour is for
The map estimates delay between cloud regions. It does not measure a network you do not own and it does not send traffic through someone else's systems on your behalf beyond the published estimate.
Users near one region and data in another pay the delay on every round trip. Write the budget the application can stand. A VPN back to the office adds more. The hybrid page owns that path.
One application. Choosing a region because the number was the smallest, while the data-residency rule says otherwise, is the mistake to catch on paper.
The change you can finish
Apply nothing during the writing of the note. When the lab window opens, it is one change on the device named in the ticket. Read the draft, then the device, then decide.
Rollback is the file or the revision you saved first. You do not invent a rollback after the only copy is gone.
- Name the application.
- Read the region pair.
- Write the latency budget.
- Check the residency rule.
- Do not move the workload in this hour.
- Stop.
Mistakes that outlive the command
Cloud Region Latency Explained goes wrong in a small set of ways. The list is here so the ticket can forbid them before the window.
- Moving production because a cell was green.
- Ignoring a residency rule.
- Treating the estimate as a probe of a third party.
- Changing regions and the VPN in one window.
Decisions to write down
One decision for Cloud Region Latency Explained: The application is yours. The pair is written. Residency was checked. Nothing was moved. And the VPN is a later page.
Checks before you call it done
Confirm this before you call the change done: One pair is in the note. The budget is a number you can say. Residency allows it. No workload moved. And no probe was launched. If one of those fails, stop.
Before you leave the device
Cloud Region Latency Explained ends when the hostname on the device matches the hostname in the ticket. If it does not, you are on the wrong box. Stop. A command that succeeded on the wrong box is not progress.
The draft stays a draft until a person has read the names in it. A generator does not log into the device and does not know which interface is the uplink. You delete a line that names a device, a zone, or a prefix you did not write down.
0.0.0.0/0 is not kept because a sample included it. A source you can say is the source you keep. 192.0.2.0/24, 198.51.100.0/24, 203.0.113.0/24, and 2001:db8::/32 are documentation. They belong in the note. They are not prefixes you type onto a production device because they appeared in a draft.
prompt-for-this is a reminder that a secret is missing. It is not a password, a key, a community string, or a pre-shared key you save in the ticket or in git. The real secret stays in the store.
One change is the window. A VLAN and a routing protocol and a VPN do not share it. If two things move and the result is wrong, you will not know which one did it. The next feature waits for its own page.
If the same step fails twice, stop for the day. The failure is the result. Adding a forum command beside a half-applied config produces a device nobody can rebuild. Restore the copy you took first.
A second person reads the device name and the change aloud. If they cannot find them in the ticket, the note is not done. Silence is not agreement. Then leave the device alone.
This page is a planning guide. It is not a vendor manual, not an official standard, and not a permission to touch a network you do not administer. The pillar guide owns the wider design. This page owns one lab proof.
Tools for this guide
These tools run in the browser on this site. They do not log into your machines.
Related pillar guides
More in this cluster
The pillar for this page, and the next published pages filed with it.