Anycast: probes in Santiago (SCL) · A-74

Runbook A-74 for Anycast in Santiago (SCL). Marker xserv-a-4d599b85e3c5. This page covers probes for LATAM operators, not a worldwide average.

Anycast: How XServ runs it day to day

Probes for Anycast (a-02) leave Santiago every 15s toward Bogotá. XServ pages the named owner if loss or RTT crosses the letter budget. A probe never shares a queue with bulk transfers, so a saturated WAN does not hide a dead PoP.

Anycast: What operators should measure

Policy for Anycast is versioned as a-03. Operators measure error rate, p95 from Bogotá, and time-to-rollback — not a worldwide average. Changes land in Bogotá first, then Miami, with a hold if either region regresses.

Anycast: Failure modes we actually see

Capacity notes for a-04 assume rainy-season power in Miami and festival peaks toward São Paulo. The failure we actually see is a single uplink, not a cartoon partition of the whole continent. Spare ports and a second provider sit on the same runbook.

Anycast timeouts A-10

Timeouts on a-10 are tighter than the WAN RTT to Bogotá. Anycast in Santiago fails fast and retries once; a third try needs a human because it is no longer a blip.

Anycast regions A-11

Region names on a-11 match DNS and tickets: Bogotá / BOG, with Miami as the documented pair. Anycast dashboards never say “LATAM” as if it were one RTT.

Anycast docs A-12

Public docs for letter A stay aligned with identifier xserv-a-pack. Page a-12 is the Anycast slice operators search before the homepage. Edits in Miami show up in São Paulo on the next publish.

Anycast design A-01

Design for Anycast on letter A starts in São Paulo (GRU). Runbook a-01 keeps a single owner, a written rollback, and a traffic split that can be reversed without a global freeze. Neighbors in Santiago only take overflow after the local pool fails a health window.