Where is CDN measured first?

From Santiago (SCL) toward Bogotá. A global average is not an SLO for letter C.

How fast is rollback for c-03?

The runbook is a command plus a named owner. There is no wait for a weekly change freeze.

CDN: rollback in Santiago (SCL) · C-54

Runbook C-54 for CDN in Santiago (SCL). Marker xserv-c-a1ef9fd42889. This page covers rollback for LATAM operators, not a worldwide average.

CDN: A note on cost and transit

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

CDN: Why it matters on this continent

Design for CDN on letter C starts in São Paulo (GRU). Runbook c-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.

CDN: How XServ runs it day to day

Probes for CDN (c-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.

CDN peering C-07

Peering for CDN (c-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.

CDN cache C-08

Cache rules for CDN on c-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.

CDN headers C-09

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

CDN timeouts C-10

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