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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 core or edge of a service provider ...
Line card running IOS XR. IOS XR is a release train of Cisco Systems' widely deployed Internetwork Operating System (IOS), used on their high-end Network Convergence System (NCS) and carrier-grade routers such as the ASR 9000 series and Carrier Routing System series of routers.
A route is considered unreachable if the hop count exceeds the maximum allowed. Route poisoning is a method of quickly forgetting outdated routing information from other router's routing tables by changing its hop count to be unreachable (higher than the maximum number of hops allowed) and sending a routing update.
Cisco had already issued a patch, but asked that the flaw not be disclosed. [18] Cisco filed a lawsuit, but settled after an injunction was issued to prevent further disclosures. [19] With IOS being phased out on devices, IOS-XE adopted many improvements including updated defaults. Some use cases can now store secrets as one-way hashes.
RIPv1 routing tables are therefore updated every 25 to 35 seconds. [4] The RIPv1 protocol adds a small random time variable to the update time, to avoid routing tables synchronizing across a LAN. [5] It was thought, as a result of random initialization, the routing updates would spread out in time, but this was not true in practice.
Enhanced Interior Gateway Routing Protocol (EIGRP) is an advanced distance-vector routing protocol that is used on a computer network for automating routing decisions and configuration. The protocol was designed by Cisco Systems as a proprietary protocol, available only on Cisco routers.
On-Demand Routing ("ODR") is an enhancement to Cisco Discovery Protocol (CDP), a protocol used to discover other Cisco devices on either broadcast or non-broadcast media. With the help of CDP, it is possible to find the device type, the IP address, the Cisco IOS version running on the neighbor Cisco device, the capabilities of the neighbor device, and so on.
UTM distribution with routing, firewall, anti-spam and anti-virus for web, FTP and e-mail, OpenVPN, IPsec, captive portal functionality, and captive portal (missing in community version). Endian Firewall Community (EFW) is a complete version for x86. The anti-virus for EFW is Sophos or ClamAV. The intrusion protection is Snort. fli4l: Active