China
Africa
Explore chapters and articles related to this topic
Next Generation Ethernet
Published in Goff Hill, The Cable and Telecommunications Professionals' Reference, 2012
When there are multiple Ethernet links between two switches, they can be aggregated together into a Link Aggregation Group (LAG), which can be logically treated as a single link with a higher speed. A Link Aggregation Control Protocol (LACP) is utilized to control the properties of the link by communicating with the switches at either end of the logical link. Traffic is distributed across the individual links by means of a hashing algorithm in a manner that maintains frame ordering for each communication session. A LAG can be used to protect against failure of an individual link in the group by redistributing the traffic between the remaining links. When the failed link has been restored, the LAG distribution function reintroduces it to allow redistribution of traffic.
Intent-Driven Campus Network Deployment Practices
Published in Ningguo Shen, Bin Yu, Mingxiang Huang, Hailin Xu, Campus Network Architectures and Technologies, 2021
Ningguo Shen, Bin Yu, Mingxiang Huang, Hailin Xu
Link-level reliability relies primarily on link redundancy. On a campus network, the dual-uplink redundancy design is typically used to improve link reliability between devices. For redundant links, link aggregation technology is leveraged to virtualize multiple physical links into one logical Eth-Trunk link using the Link Aggregation Control Protocol (LACP). The interfaces are then grouped into an Eth-Trunk interface. Link aggregation enhances the reliability of links between devices and increases the link bandwidth without requiring hardware upgrades. Consequently, LACP-based link aggregation is recommended between devices on the campus network.
The Switch/Router
Published in James Aweya, Switch/Router Architectures, 2019
The Link Aggregation Control Protocol (LACP) is part of the IEEE 802.3ad standard (now defined in IEEE 802.1AX) and provides mechanisms for creating port channels called link aggregation groups (LAGs). Link aggregation using LACP allows a user to aggregate one or more Ethernet interfaces to form a single logical point-to-point link (or port channel) called a LAG. Two Ethernet switches can automatically establish and maintain LAGs between them using LACP. EtherChannel is a proprietary technology developed by Cisco for creating port-channel or port link aggregation and is primarily used in Cisco switches.
Virtualised Environment for Learning SDN-based Networking
Published in IETE Journal of Education, 2020
Oscar Polanco, Fabio G. Guerrero
Many other network concepts such as, for instance, routing (BGP, MP-BGP, OSPF, IS-IS, EIGRP, etc.), multiple protocol label switching (MPLS) networks, and services can also be practised. We have also found the virtualisation approach to be useful for network security analysis, MPLS traffic engineering, and IPv6 based networks. Using the virtualised educational network environment, students can work autonomously to implement a campus network with layer 2 technologies and protocols (e.g. VLANs, IEEE 802.1q, STP, multiple STP, link aggregation control protocol) as well as layer 3 technologies and protocols (e.g. virtual router redundancy protocol, OSPF, IPv4, and IPv6). Students can also implement scenarios for management and automation (SNMP, Ansible) of a basic ISP infrastructure and, if necessary, connect it to the physical world, along with configuring MPLS services that ISPs usually provide to users (e.g. VPN-MPLS, central services, access to the Internet, etc.). The virtualization approach has several practical advantages. Owing to its associated costs, it is difficult to keep the network equipment of a computer network laboratory always updated. Internet service providers, for obvious reasons, hardly allow outsiders to get details of their network topologies, protocols, and settings. Carrying out an instructional activity involving sensitive aspects such as routing in an operational network is not realistic.