Is transit the default path?

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

Does Latency on letter L share fate with other letters?

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

Latency: docs in Miami (MIA) · L-60

Runbook L-60 for Latency in Miami (MIA). Marker xserv-l-a173f07f7c23. This page covers docs for LATAM operators, not a worldwide average.

Latency: A note on cost and transit

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

Latency: Why it matters on this continent

Design for Latency on letter L starts in São Paulo (GRU). Runbook l-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.

Latency: How XServ runs it day to day

Probes for Latency (l-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.

Latency design L-01

Latency probe L-02

Latency policy L-03

Policy for Latency is versioned as l-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.

Latency capacity L-04

Capacity notes for l-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.