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The switches are also capable of layer 3 or layer 4 equal-cost multi-path routing (ECMP), and applying per-port L3/L4 access-control lists (ACLs) entirely in hardware. In November 2013, Arista Networks introduced the Spline network, combining leaf and spine architectures into a single-tier network, aiming to cut operating costs.
Allen-Bradley Stratix 5400, 5410, 5700, 8000 Managed Switches [9] Arista 7050X/X2/X3 Series Switches; Arista 7060X/X2 Series Switches; Arista 7150 Series Switches [10] Arista 7280E/R/R2 Series Switches; Arista 7500E/R/R2 Series Switches; Aruba 2930M Series Switches (with WC.16.04 software release) Aruba CX 6300 M series; Aruba CX 8360
A LAG is a method of inverse multiplexing over multiple Ethernet links, thereby increasing bandwidth and providing redundancy. It is defined by the IEEE 802.1AX-2008 standard, which states, "Link Aggregation allows one or more links to be aggregated together to form a Link Aggregation Group, such that a MAC client can treat the Link Aggregation Group as if it were a single link."
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.
Switching uses different kinds of network switches. A standard switch is known as a layer-2 switch and is commonly found in nearly any LAN. Layer-3 or layer-4 switches require advanced technology (see managed switch) and are more expensive and thus are usually only found in larger LANs or in special network environments.
An example of how to configure a simple, three switch MSTP topology wherein a layer-two access switch carries four VLANs and has two uplinks to two distribution switches, can be found here: MSTP Configuration Guide A good configuration view, from the above-mentioned example shall be: S3# show spanning-tree mst
Typically, this includes routers, switches, access points, network interface cards and other related hardware. This is a list of notable vendors who produce network hardware. This is a list of notable vendors who produce network hardware.
OSPF is a layer 3 protocol. If a layer 2 switch is between the two devices running OSPF, one side may negotiate a speed different from the other side. This can create an asymmetric routing on the link (Router 1 to Router 2 could cost '1' and the return path could cost '10'), which may lead to unintended consequences.
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