Network SLA: Defining and Contracting Service Commitments

April 15, 2026·2 min read·263 words

Define and formalize network SLAs: availability, latency, throughput, and MTTR. Internal SLAs (IT → business) + external SLAs (MSP → customer). Measurement, reporting, and service credits. 2026 guide for CIOs.

SLA Metrics

Availability (Uptime): 99.5% to 99.999%
Latency: maximum WAN/LAN latency in ms
Packet loss: <0.1% for critical services
Jitter: <30 ms for VoIP
Throughput: guaranteed minimum
MTTR (Mean Time To Resolve)
Ticket response time: P1 <15 min

Standard Levels

99%: 3.65 days of downtime/year — unacceptable for modern environments
99.5%: 1.83 days — basic SMB requirements
99.9%: 8.77 hours — standard SMB requirements
99.95%: 4.38 hours — mid-market enterprises
99.99%: 52 min — critical services
99.999%: 5.26 min — banking and emergency healthcare

Internal SLA (IT → Business)

Service agreement: defines responsibilities
Exclusions: scheduled maintenance, force majeure
Annual review
Budget impact: a higher SLA requires greater infrastructure investment

External SLA (MSP / Provider)

Contractual: provider commitment
Service credits: X% of the invoice if the target is not met (capped at 10-20%)
Important: service credits ≠ actual losses
Independent monitoring recommended

SLA Measurement

Continuous monitoring: Prometheus, PRTG, ThousandEyes
Synthetic transactions: ping, HTTP, apps
ThousandEyes: external user perspective
User sentiment: surveys + NPS
Mandatory monthly reporting

Standard Exclusions

Scheduled maintenance (notified 48 hours in advance)
Force majeure
User actions (configuration errors)
Third-party factors (ISP outage)
Vendor TAC response time

Key Clauses

Precise uptime definition (who measures it, and how?)
Measurement window (monthly rolling or yearly)
Progressive penalties
Termination right if the SLA is missed 3× consecutively
Quarterly review
Automated reporting

Order from OPTINOC

Support for drafting internal/external SLAs. Independent monitoring. Quote within 48 hours.