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In the Cisco IOS, [1] they are used in several places, for example: To indicate the size of a network or subnet for some routing protocols, such as OSPF. To indicate what IP addresses should be permitted or denied in access control lists (ACLs). A wildcard mask can be thought of as an inverted subnet mask.
Border Gateway Protocol (BGP) is a standardized exterior gateway protocol designed to exchange routing and reachability information among autonomous systems (AS) on the Internet. [2] BGP is classified as a path-vector routing protocol, [3] and it makes routing decisions based on paths, network policies, or rule-sets configured by a network ...
For example, on Cisco routers, routes issued by the Open Shortest Path First routing protocol have a lower default administrative distance than routes issued by the Routing Information Protocol. This is because, by default on Cisco routers, OSPF has a default administrative distance of 110 and RIP has a default administrative distance of 120.
Multiprotocol Extensions for BGP (MBGP or MP-BGP), sometimes referred to as Multiprotocol BGP or Multicast BGP and defined in IETF RFC 4760, [1] is an extension to Border Gateway Protocol (BGP) that allows different types of addresses (known as address families) to be distributed in parallel.
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The design on the napkin was expanded to three hand-written sheets of paper from which the first interoperable BGP implementation was quickly developed. A photocopy of these 3 sheets of paper now hangs on the wall of a routing protocol development area at Cisco Systems in Milpitas, California.
The concept of BGP hijacking involves identifying an Internet Service Provider (ISP) that does not filter advertisements, whether intentionally or unintentionally, or identifying an ISP with vulnerable internal or ISP-to-ISP BGP sessions susceptible to a man-in-the-middle attack. Once identified, an attacker can potentially advertise any prefix ...
EtherType is a two-octet field in an Ethernet frame.It is used to indicate which protocol is encapsulated in the payload of the frame and is used at the receiving end by the data link layer to determine how the payload is processed.