Characteristics of dynamic IP routing protocols

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Characteristics of dynamic IP routing protocols

Characteristics of dynamic IP routing protocols

Posted: 15 Jan 2011 05:04 AM PST


Below are some important characteristics of various Dynamic Routing Protocols that are used in Cisco IOS routers.

RIPv2

* Distance Vector Protocol.
* Suitable for small to medium networks.
* Average convergence speed.
* Supports VLSM.
* Supports CIDR.
* Standardized protocols (supports multi-vendor networks.)
* Multicast address for updates: 224.0.0.9
* Administrative distance: 120.
* Difficulty to Administer: Low

EIGRP

* Advanced distance vector protocol.
* Suitable for routing in large networks.
* Very high speed of convergence.
* Supports VLSM.
* Supports CIDR.
* Cisco proprietary.
* Multicast address for updates: 224.0.0.10
* Administrative Distance: internal 90, external 170.
* Difficulty to Administer: Medium

OSPFv2

* Link state protocol.
* Suitable for routing in large networks.
* High convergence speed.
* Supports VLSM.
* Supports CIDR.
* Standardized (supports multi-vendor networks.)
* Multicast address for updates: 224.0.0.5 / 224.0.0.6
* Administrative distance: 110.
* Difficulty to Administer: Medium

IS-IS

* Link state protocol.
* Suitable for routing in large networks.
* High convergence speed.
* Supports VLSM.
* Supports CIDR.
* OSI standard (it supports multi-vendor networks.)
* Administrative distance: 115.
* Difficulty to Administer: High.

BGPv4

* Path vector protocol.
* Suitable for the Internet (between Autonomous Systems or within ISP networks).
* Speed of convergence: low.
* Supports VLSM.
* Supports CIDR.
* Standard (supports multi-vendor networks.)
* Updates unicast.
* Administrative Distance: 20 eBGP, iBGP 200.
* Difficulty to Administer: High.

Some Notes about MPLS

Service Providers use MPLS networks (MultiProtocol Label Switching) to offer IP network connectivity to their clients. The usual connectivity services offered from MPLS networks are Layer3 VPNs and Layer2 VPNs (usually point-to-point Layer 2). An MPLS network makes use of two different Routing Protocols. An Interior Gateway Protocol (usually OSPF or IS-IS) and also BGPv4 which is a modified version of the regular BGP protocol and is used to carry MPLS label information within the MPLS network.

Broadband: How will faster wireless affect wireline?

Posted: 14 Jan 2011 08:00 AM PST


Several announcements in the last month got us to thinking about what effect faster wireless broadband speeds will have on wireline broadband. For example, could 4G/LTE broadband wireless substitute for wireline broadband access to the extent that wireless voice has replaced wired phone lines? Could 4G/LTE wireless broadband supplement wireline in cases of disaster recovery or in remote areas in lieu of a satellite broadband connection? Of will 4G/LTE hasten the move of cloud-based applications to mobile devices?

The government really is here to help

Posted: 14 Jan 2011 08:00 AM PST


Back in June the U.S. government issued a draft of The National Strategy for Trusted Identities in Cyberspace. A number of good friends in the so-called user-centric identity community attended meetings where the draft was promulgated, and said that -- on the whole -- it was a good initiative. There was so little controversy, in fact, that we didn't even note it at the time here in the IdM newsletter. I'd planned to wait until the final version arrived.

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