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Juniper Networks' Trivia on DataCenter

Youtube Channel, multiple videos Doug Hanks, Steve Levine

DataCenter Bridging?

  • DCB is suite of protocols to allow converge storage in DataCenter.

  • Collapse storage and data into single network. Require lossles transfer protocols.

Priority-Based Flow Control in DataCenter?

  • PFC is a protocol for DCB. If server talks to storage devices, they can tell each other to slow down in case resource contention.

Preserve lossless behavior on SDN or overlay network?

  • SDN or overlay makes your network config act at Layer-3

  • Can use PFC. Can see how point to point link are cnfigure to enable PFC.

Overlay network in a DataCenter?

  • SDN's overlay provides agility to maintain network programmatically.

  • De-couples the logical network from physical hardware.

Virtual Chassis Fabric?

  • With Overlay Network, acquire IP Fabric. It encapsulated is Virtual Chassis Fabric.

  • Single point of management.

  • It's plug-n-play ethernet fabric.

How does ISSU work on QFX 5100?

  • Virtualized control plane with KVM, JunOS running inside it.

  • When need ISSU, start a new instance of ISSU and then switch control.

  • No loss in Data Plane.

What is best Control Plane protocol for DataCenter IP Fabric?

  • For IP Fabric

advertise prefixes move from point.A to point.B in network traffic tagging (keep track of what came from where)

  • Options

OSPF ISIS BGP

  • BGP

can do traffic tagging and engineering best use-case Internet, runs on BGP

but keep tabs on security flaws in implementation

What is DCBX and why use it in DataCenter?

  • DataCenter Bridging eXtensions.
  • Collapse data and storage on same hardware. Enable plug-n-play.
  • It enables switches automatically identify what capability is there.