The Link with Stan Grant takes the stories we're all talking about and explains what they mean for you.

The Link - Netflix

Type: News

Languages: English

Status: Running

Runtime: 30 minutes

Premier: 2017-03-10

The Link - Link aggregation - Netflix

In computer networking, the term link aggregation applies to various methods of combining (aggregating) multiple network connections in parallel in order to increase throughput beyond what a single connection could sustain, and to provide redundancy in case one of the links should fail. A Link Aggregation Group (LAG) combines a number of physical ports together to make a single high-bandwidth data path, so as to implement the traffic load sharing among the member ports in the group and to enhance the connection reliability. Other umbrella terms used to describe the method include port trunking, link bundling, Ethernet/network/NIC bonding, or NIC teaming. These umbrella terms encompass not only vendor-independent standards such as Link Aggregation Control Protocol (LACP) for Ethernet defined in IEEE 802.1AX or the previous IEEE 802.3ad, but also various proprietary solutions. Network architects can implement aggregation at any of the lowest three layers of the OSI model. Examples of aggregation at layer 1 (physical layer) include power line (e.g. IEEE 1901) and wireless (e.g. IEEE 802.11) network devices that combine multiple frequency bands. OSI layer 2 (data link layer, e.g. Ethernet frame in LANs or multi-link PPP in WANs, Ethernet MAC address) aggregation typically occurs across switch ports, which can be either physical ports, or virtual ones managed by an operating system. Aggregation at layer 3 (network layer) in the OSI model can use round-robin scheduling, hash values computed from fields in the packet header, or a combination of these two methods. Regardless of the layer on which aggregation occurs, it may balance the network load across all links. This is not always the case. Most methods provide failover as well. Combining can either occur such that multiple interfaces share one logical address (i.e. IP) or one physical address (i.e. MAC address), or it allows each interface to have its own address. The former requires that both ends of a link use the same aggregation method, but has performance advantages over the latter.

The Link - Virtualization platforms - Netflix

Citrix XenServer and VMware ESX have native support for link-aggregation. XenServer offers both static-LAG's as well as LACP. vSphere 5.1 (ESXi) now supports both static-LAG's and LACP natively with their virtual distributed switch. For Microsoft's Hyper-V, bonding or teaming isn't offered from the hyper-visor or OS-level, but the above-mentioned methods for teaming under Windows applies to Hyper-V as well.

The Link - References - Netflix