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Applications of Switch/Router
Published in James Aweya, Designing Switch/Routers, 2023
VRRP creates a virtual router interface that can be shared by two or more routers. The interface consists of a virtual MAC address and a virtual IP address. Each server is configured with the VRRP virtual interface as the default gateway. Each of the routers participating in the virtual interface is assigned a priority that determines which is the primary router. The VRRP routers multicast periodic “hello” messages that include the priority of the sending router. In the event the primary VRRP router fails, the secondary router detects the missing hello, determines that it has the highest remaining priority, and begins processing the traffic addressed to the virtual interface.
Reliability and Scalability Methods
Published in Al Kovalick, Video Systems in an IT Environment, 2013
Finally, there is a method (not shown) for creating a fault-tolerant “virtual router” using a pair of routers. One router is in standby, while the other is active. The Virtual Router Redundancy Protocol (VRRP, RFC 2338) performs an automatic failover between the two routers in the event that the active one fails. All connecting links attach to both routers, so there is always routed connectivity via one switch or the other. In effect, VRRP creates a NSPOF-configured router.
Mapping Network Device Functions to the OSI Reference Model
Published in James Aweya, Designing Switch/Routers, 2023
VRRP creates a virtual router interface that can be shared by two or more routers. The interface consists of a virtual MAC address and a virtual IP address. Each database server is configured with the VRRP virtual interface as the default gateway. Each of the routers participating in the virtual interface is assigned a priority that determines which is the primary router.
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.