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The process of forming a supernet is called supernetting, prefix aggregation, route aggregation, or route summarization. Supernetting within the Internet serves as a strategy to avoid fragmentation of the IP address space by using a hierarchical allocation system that delegates control of segments of address space to regional Internet ...
Classless Inter-Domain Routing (CIDR / ˈ s aɪ d ər, ˈ s ɪ-/) is a method for allocating IP addresses for IP routing. The Internet Engineering Task Force introduced CIDR in 1993 to replace the previous classful network addressing architecture on the Internet .
The link-state ID of the type 2 LSA is the IP interface address of the DR. 3 Summary-LSAs The ABR Type 3 summary-LSAs describe routes to networks. To inform other areas about inter-area routers. These routes can also be summarised. 4 ASBR-summary The ABR Type 4 describe routes to AS boundary routers beyond its area.
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.
The no auto-summary command prevents automatic route summarization on classful boundaries, which would otherwise result in routing loops in discontiguous networks. Router# configure terminal Router(config)# router eigrp 1 Router (config-router)# network 10.201.96.0 0.0.15.255 Router (config-router)# no auto-summary Router (config-router)# exit
Each summary-LSA describes a route to a destination outside the area, yet still inside the AS (i.e., an inter-area route). This summarization helps provide scalability by removing detailed topology information for other areas, because their routing information is summarized into just an address prefix and metric.
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 ...
The letter "S" indicates that the route is a static route that has, for all intents and purposes, been added manually to the router process by the administrator and installed into the routing table. Router#enable Router#configure terminal Router(config)#ip route 1.1.1.0 255.255.255.0 fastEthernet 0/0 Router(config)#do show ip route
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