Time to live, the caching lifetime of a DNS record. A short value (five minutes, say) on the FQDN used for NSX Manager is what lets an NSX Multisite management plane be manually recovered at the other site.
Also called time to live.
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Each book explains TTL in context, with comparison tables and the common traps.
Terms in this definition
- TTL
Automatic deletion after a number of seconds. In Cosmos DB it is set per container with DefaultTimeToLive or per item with ttl; in Redis it is set on a key.
- DNS
The system that turns names into addresses. In Azure, private endpoints depend on private DNS zones, which are queried through 168.63.129.16.
- FQDN
The full DNS name of a host, zone included, for example www.contoso.com.
- NSX Manager
Runs NSX's management and control planes. Through its interface or API, admins create segments, VPCs and transit gateways and steer traffic; one copy may belong to a single VCF domain or be shared.
- NSX Multisite
Unlike NSX Federation, with its Global Manager and per-location manager clusters, this option runs NSX across two metropolitan sites (latency below 10 ms, VLAN stretched) from one NSX Manager cluster and keeps every NSX feature. Management-plane recovery is automatic only if NSX Manager sits on a stretched vCenter cluster, where vSphere HA restarts it at the other site.
- Management plane
Layer of Azure operations that act on a resource itself, such as changing a key vault's properties, firewall or access policies. Azure RBAC authorises it, and it gives no access to the data inside the resource.
- LSDOU
The sequence in which Group Policy is processed: the local policy first, followed by site, domain and organisational unit policies. The nearest, last-processed setting takes effect unless Enforced or Block Inheritance alters that.