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  2. Cisco IOS - Wikipedia

    en.wikipedia.org/wiki/Cisco_IOS

    An Interface Descriptor Block, or simply IDB, is a portion of memory or Cisco IOS internal data structure that contains information such as the IP address, interface state, and packet statistics for networking data.

  3. UDP Helper Address - Wikipedia

    en.wikipedia.org/wiki/UDP_Helper_Address

    Cisco's first implementation of this protocol was introduced in version 10 of their router software. [1] It is implemented through the use of the router configuration commands ip helper-address and ip forward-protocol.

  4. Network address translation - Wikipedia

    en.wikipedia.org/wiki/Network_address_translation

    Network address translation between a private network and the Internet. Network address translation (NAT) is a method of mapping an IP address space into another by modifying network address information in the IP header of packets while they are in transit across a traffic routing device. [1]

  5. Enhanced Interior Gateway Routing Protocol - Wikipedia

    en.wikipedia.org/wiki/Enhanced_Interior_Gateway...

    The protocol was designed by Cisco Systems as a proprietary protocol, available only on Cisco routers. In 2013, Cisco permitted other vendors to freely implement a limited version of EIGRP with some of its associated features such as High Availability (HA), while withholding other EIGRP features such as EIGRP stub, needed for DMVPN and large ...

  6. Multicast address - Wikipedia

    en.wikipedia.org/wiki/Multicast_address

    The Cisco multicast router AUTO-RP-ANNOUNCE address is used by RP mapping agents to listen for candidate announcements. Yes 224.0.1.40 The Cisco multicast router AUTO-RP-DISCOVERY address is the destination address for messages from the RP mapping agent to discover candidates. Yes 224.0.1.41 H.323 Gatekeeper discovery address Yes 224.0.1.129–132

  7. Carrier Routing System - Wikipedia

    en.wikipedia.org/wiki/Carrier_Routing_System

    Cisco CRS-1 Backbone Core Router. 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 ...

  8. Cisco Discovery Protocol - Wikipedia

    en.wikipedia.org/wiki/Cisco_Discovery_Protocol

    Cisco Discovery Protocol (CDP) is a proprietary data link layer protocol developed by Cisco Systems in 1994 [1] by Keith McCloghrie and Dino Farinacci. It is used to share information about other directly connected Cisco equipment, such as the operating system version and IP address.

  9. Hot Standby Router Protocol - Wikipedia

    en.wikipedia.org/wiki/Hot_Standby_Router_Protocol

    The primary router with the highest configured priority will act as a virtual router with a pre-defined gateway IP address and will respond to the ARP or ND request from machines connected to the LAN with a virtual MAC address. If the primary router should fail, the router with the next-highest priority would take over the gateway IP address ...