F5 Device Service Clustering Flashcards
What is device service clustering?
An underlying architecture within BIG-IP Traffic Management Operation System (TMOS). It provides synchronization and failover of BIG-IP configuration data at user-defined levels of granularity, among multiple BIG-IP devices on a network.
What are some features of DSC?
- Synchronize some or all of its configuration data among several BIG-IP devices
- Fail over to one of many available devices
- Mirror connections to a peer device to prevent interruption in service during failover
What are some components of DSC?
Devices, Device groups, Traffic groups, Device trust and trust domains, and Folders.
What is a Device Trust and Trust Domain?
Underlying the success of device groups and traffic groups is a feature known as device trust. Device trust establishes trust relationships between BIG-IP devices on the network, through mutual certificate-based authentication. A trust domain is a collection of BIG-IP devices that trust one another and is a prerequisite for creating a device group for config sync and failover operations. The trust domain is represented by a special system-generated and system-managed device group named device_trust_group, which is used to synchronize trust domain information across all devices.
What is a Device Group?
A device group is a collection of BIG-IP devices that trust each other and can synchronize, and sometimes fail over, their BIG-IP configuration data. You can create two types of devices groups: A Sync-Failover device group contains devices that synchronize configuration data and support traffic groups for failover purposes when a device becomes unavailable. A Sync-Only device group contains devices that synchronize configuration data, such as policy data, but do not synchronize failover objects.
Within DSC, what is a Device?
A device is a physical or virtual BIG-IP system, as well as a member of a local trust domain and a device group. Each device member has a set of unique identification properties that the BIG-IP system generates.
What are the DSC communication ports?
1) TCP 4353 - Synchronizes configuration data
2) TCP 1029-155 - Connection and persistence mirroring
3) UDP 1026 - Failover Heartbeat
