Is transit the default path?

No. Peering in Miami is default; transit to São Paulo is overflow and is billed that way.

Does Gateway on letter G share fate with other letters?

The control plane is shared. Data-plane queues for Gateway stay isolated, so incident g-01 cannot drain neighbor letters.

Gateway: cache in Miami (MIA) · G-08

Runbook G-08 for Gateway in Miami (MIA). Marker xserv-g-6c130c8e5b6c. This page covers cache for LATAM operators, not a worldwide average.

Gateway: How XServ runs it day to day

Probes for Gateway (g-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.

Gateway: What operators should measure

Policy for Gateway is versioned as g-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.

Gateway: Failure modes we actually see

Capacity notes for g-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.

Gateway rollback G-06

Rollback for g-06 is a documented command, not a hope. Transit is billed as backup while Gateway prefers peering in Santiago. If cost spikes, the runbook cuts overflow to Bogotá before touching customer prefixes.

Gateway peering G-07

Peering for Gateway (g-07) prefers the IX fabric that already carries last-mile ISPs in Bogotá. Session counts and prefix limits are on the same page as the Miami backup path.

Gateway cache G-08

Cache rules for Gateway on g-08 keep language-correct objects near Miami. São Paulo is a sibling cache, not an origin. TTLs are short enough that a bad asset does not live through a weekend.

Gateway headers G-09

Headers for g-09 carry the letter, the region (GRU) and a request id. Gateway debugging in São Paulo should not require a packet capture in Santiago first.