routing-protocol.blogspot.com
Routing Protocols: AS Regular Expression
http://routing-protocol.blogspot.com/2009/07/as-regular-expression.html
Welcome to IT Networking Guide. Tuesday, July 28, 2009. A regular expression is a pattern to match against an input string. When you build a regular expression, you specify a string that input must match. In the case of BGP, you specify a string that consists of path information that an input must match. A regular expression comprises:. A range is a sequence of characters within left and right square brackets. An example is [abcd]. An atom is a single character. The matches any single character. Here I'l...
lan-technology.blogspot.com
LAN Techonology: HSRP
http://lan-technology.blogspot.com/2008/07/hsrp-is-cisco-proprietary-protocol.html
Welcome to IT Networking Guide. Saturday, July 5, 2008. Protocol developed to allow several routers or multilayer switches to appear as a single gateway IP address for internal hosts. HSRP active router election is based on a priority value (0 to 255). That is configured on each router in the group. Default priority is 100. To the multicast destination 224.0.0.2 using UDP port 1985). If hellos are missed for the duration of the holdtime timer (default 10 seconds. Hello message conveys router's HSRP prior...
routing-protocol.blogspot.com
Routing Protocols: July 2009
http://routing-protocol.blogspot.com/2009_07_01_archive.html
Welcome to IT Networking Guide. Tuesday, July 28, 2009. A regular expression is a pattern to match against an input string. When you build a regular expression, you specify a string that input must match. In the case of BGP, you specify a string that consists of path information that an input must match. A regular expression comprises:. A range is a sequence of characters within left and right square brackets. An example is [abcd]. An atom is a single character. The matches any single character. Border G...
lan-technology.blogspot.com
LAN Techonology: July 2008
http://lan-technology.blogspot.com/2008_07_01_archive.html
Welcome to IT Networking Guide. Sunday, July 6, 2008. Virtual LANs (VLANs) enable network managers to group users logically rather than by physical location. Enters global configuration mode. Switch(config)# interface {gigabitethernet fastethernet} card/subcard/port.subinterface. Enters subinterface configuration mode. Specifies ISL encapsulation for the Ethernet frames sent from this subinterface, with a header that maintains the specified VLAN ID between network nodes. Switch# copy system:running-confi...
routing-protocol.blogspot.com
Routing Protocols: July 2008
http://routing-protocol.blogspot.com/2008_07_01_archive.html
Welcome to IT Networking Guide. Wednesday, July 2, 2008. BGP is an exterior gateway protocol and uses TCP (port 179) as its underlying delivery mechanism. BGP updates are incremental and triggered. Because BGP rides on TCP, a separate point-to-point connection to each peer must be established. BGP uses AS numbers ( AS PATH. As a default metric to determine the best/shortest path for destination network. BGP is also called as path vector routing protocol. And the BGP is called internal BGP (IBGP). When tw...
lan-technology.blogspot.com
LAN Techonology: June 2008
http://lan-technology.blogspot.com/2008_06_01_archive.html
Welcome to IT Networking Guide. Saturday, June 28, 2008. STP (Spanning Tree Protocol) 802.1D. STP is used to prevent L2 loops and at the same time provide redundancy. STP prevents loops in the network by assigning either the blocking or forwarding state on the ports. Hence with these two states STP provide redundancy as well as preventing loops in the network. This mechanism guarantees that there is one and only one active path between two network devices. STP uses 3 types of timers. Root Bridge ID and S...
routing-protocol.blogspot.com
Routing Protocols: June 2008
http://routing-protocol.blogspot.com/2008_06_01_archive.html
Welcome to IT Networking Guide. Friday, June 27, 2008. EIGRP allows for variable-length subnet mask (VLSM). EIGRP can summarize not only at any router, but also at any interface on any router. EIGRP provide Loop-free networks with the help of DUAL Algorithm. It selects two paths to reach to the destination, best one is called as. And second best is called as. Provide rapid convergence when there is change in the topology because of DUAL algorithm. Non-periodic, partially bounded updates. If all of the ab...
routing-protocol.blogspot.com
Routing Protocols: Internet Connectivity – BGP Configuration
http://routing-protocol.blogspot.com/2009/07/internet-connectivity-bgp-configuration.html
Welcome to IT Networking Guide. Tuesday, July 28, 2009. Internet Connectivity – BGP Configuration. Border Gateway Protocol (BGP) is one of the key protocols to use to achieve Internet connection redundancy. When you connect your network to two different Internet service providers (ISPs), it is called. This document provide configuration for following scenario;. Configuration to Prevent "Transit AS". Configuration to Receive Full Internet Routing Table. Configuration to Receive Directly-Connected Routes.
