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2. Link-state advertisement - Wikipedia

   en.wikipedia.org/wiki/Link-state_advertisement

   E-Bit: Indicative if area is AS-external capable, or STUBed. x-bit: Set 0, used previously used by MOSPF; N/P-bit: Indicative if area is NSSA. EA-bit: Indicative receive and forward External-Attributes-LSAs; DC-bit: Indicative router's handling of demand circuits, RFC 1793. O-bit: Indicative router's willingness to receive and forward Opaque-LSAs

3. Multiprotocol BGP - Wikipedia

   en.wikipedia.org/wiki/Multiprotocol_BGP

   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.

4. Border Gateway Protocol - Wikipedia

   en.wikipedia.org/wiki/Border_Gateway_Protocol

   In the Connect state, the router waits for the TCP connection to complete and transitions to the OpenSent state if successful. If unsuccessful, it starts the ConnectRetry timer and transitions to the Active state upon expiration. In the Active state, the router resets the ConnectRetry timer to zero and returns to the Connect state.

5. Path-vector routing protocol - Wikipedia

   en.wikipedia.org/wiki/Path-vector_routing_protocol

   Border Gateway Protocol (BGP) is an example of a path vector protocol. In BGP, the autonomous system boundary routers (ASBR) send path-vector messages to advertise the reachability of networks. Each router that receives a path vector message must verify the advertised path according to its policy.

6. Screened subnet - Wikipedia

   en.wikipedia.org/wiki/Screened_subnet

   In network security a screened subnet refers to the use of one or more logical screening routers as a firewall to define three separate subnets: an external router (sometimes called an access router), that separates the external network from a perimeter network, and an internal router (sometimes called a choke router) that separates the ...

7. 6to4 - Wikipedia

   en.wikipedia.org/wiki/6to4

   A 6to4 border router is an IPv6 router supporting a 6to4 pseudo-interface. It is normally the border router between an IPv6 site and a wide-area IPv4 network, where the IPv6 site uses 2002:: / 16 co-related to the IPv4 address used later on. On the other hand, a "relay router" is a 6to4 router configured to support transit routing between 6to4 ...