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Each routing protocol contains loop-avoidance mechanisms, but the information needed for loops to be avoided is lost when routes are redistributed. For example, a distance-vector routing protocol may prevent loops by the "split-horizon" rule; that is to say, if a router learns a route from a particular interface it will not re-advertise the ...
The Space Router provided the ability to route Internet Protocol computer network traffic on board the satellite, which enabled users of Web, VoIP, and other IP applications to directly communicate without having to double-hop data to and from an intermediate Earth station. The ability to avoid the double-hop to the Earth station can reduce ...
Carrier Routing System (CRS) is a modular and distributed core router developed by Cisco Systems Inc that enables service providers to deliver data, voice, and video services over a scalable IP Next-Generation Network (NGN) infrastructure. In a network topology, these routers are generally positioned in the core or edge of a service provider ...
Routing protocols, according to the OSI routing framework, are layer management protocols for the network layer, regardless of their transport mechanism: IS-IS runs on the data link layer (Layer 2) Open Shortest Path First (OSPF) is encapsulated in IP, but runs only on the IPv4 subnet, while the IPv6 version runs on the link using only link ...
IP forwarding algorithms in most routing software determine a route through a shortest path algorithm. In routers, packets arriving at an interface are examined for source and destination addressing and queued to the appropriate outgoing interface according to their destination address and a set of rules and performance metrics.
Routing Bit. Set to 1 if Routing and Offset information are present. K (1 bit) Key bit. Set to 1 if a key is present. S (1 bit) Sequence number bit. Set to 1 if a sequence number is present. s (1 bit) Strict source route bit. Recur (3 bits) Recursion control bits. Flags (5 bits) Reserved for future use, set to 0. Version (3 bits) Set to 0 ...
[5] [10] While EIGRP is an advanced routing protocol that combines many of the features of both link-state and distance-vector routing protocols, EIGRP's DUAL algorithm contains many features which make it more of a distance vector routing protocol than a link-state routing protocol. [10] [11] Despite this, EIGRP contains many differences from ...
In order to address the issues of address space and other factors, Cisco created EIGRP (Enhanced Interior Gateway Routing Protocol). EIGRP adds support for VLSM (variable length subnet mask) and adds the Diffusing Update Algorithm (DUAL) in order to improve routing and provide a loopless environment. EIGRP has completely replaced IGRP, making ...