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Dynamic routing
Static routing which was described in the Static routing article has the following critical disadvantages:
- scalability: adding a new router in the network requires changing the configuration of all the existing nodes;
- operation: changes in the network will require updating the routing information on all network nodes;
- speed: device or link failures require changes to the routing tables of the devices, which must be performed manually.
Dynamic routing protocols are free from all the mentioned disadvantages of the static routing. Besides that, some of them have the following additional benefits:
- traffic balancing: if there are several paths towards the same destination, the router balances the data between the communication channels, ensuring an even distribution of the devices and of the channels channel utilization;
- fault tolerance: automatic transition to the backup infrastructure in case of failure of the main one.
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- By the application area:
- internal: dynamic routing protocols used within an autonomous system, i.e. a set of devices and communication channels under common management (for example, ODR, RIP, OSPF);
- external: dynamic routing protocols used to exchange routing information between autonomous systems (for example, BGP).
- By the operational principles:
- distance-vector: the devices exchange the routing tables, . The network nodes operate only with information about their direct directly connected neighbors and only with routing information received from them (for example RIP, ODR);
- link state: the devices exchange the whole topology tables, each . Each network node operates with information about the structure of the entire network and can reproduce the entire scheme (for example, OSPF).
Dynamic The dynamic routing protocols are supported by the InfiNet devices of the InfiLINK 2x2 and of the InfiMAN 2x2 families. All further examples will be provided for the devices of these families.
In general, a separate module in the device's architecture is responsible for the operation of each dynamic routing protocol, however, for the operation of the RIP and the OSPF protocols, an ARDA module has been added (см. ARDA (Aqua Router Daemon)), which performs a coordination function and integration with the general system (Figure 1). OSPF The OSPF and RIP configurations are performed via ARDA.
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The attached documents contain a description of the dynamic routing protocols: ODR, RIP, OSPF. There are The child pages with device contain configuration examples for each protocol:
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