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NET-C0072 · IP & Internet Intelligence

Internet Exchange Points and Peering Explained

Explain an exchange and a peering session as a choice you have not made yet.

Updated 25 October 2026 · Explainer

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

An internet exchange is a shared fabric where networks can peer. PeeringDB is a directory those networks publish. The lookups show a record for a name or a number you type. They do not open a BGP session and they do not buy a port.

Write whether you are reading your own record or learning what an exchange is. Someone else's ASN is a label, not a peer you may configure. A session, if you ever build one, is a later ticket with prefixes you originate.

One record. Do not email a stranger from this page.

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.

  1. Look up one exchange or one network you may read.
  2. Write what the record says.
  3. Say that no session is opened.
  4. Keep foreign prefixes unannounced.
  5. Do not contact anyone from this note.
  6. Stop.

Mistakes that outlive the command

Internet Exchange Points and Peering Explained goes wrong in a small set of ways. The list is here so the ticket can forbid them before the window.

Decisions to write down

One decision for Internet Exchange Points and Peering Explained: The record was read. No session was opened. No prefix was announced. No one was contacted. And one record is the scope.

Checks before you call it done

Confirm this before you call the change done: The name or ASN is written. The exchange or network is written. No session was configured. No prefix was announced. And the note stops at the explanation. If one of those fails, stop.

Before you leave the device

Internet Exchange Points and Peering 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.

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