Posts Tagged ‘Cisco 2126XM router’

OSPF Explained and Useful Troubleshooting Commands

Wednesday, January 4th, 2012

Open Shortest Path First (OSPF) is an open standard link-state routing protocol that supports multiple equal-cost routes to the same destination (four by default). OSPF constructs a shortest path tree and then updates the routing table with the best paths. In this blog I I will be explaining OSPF in the context of OSPF on Cisco routers, so I will be using Cisco IOS command syntax. For some of the commands I have included screenshots from a Cisco 2621XM [IOS 12.3(16a)] router. (more…)


Setting-up DHCP with IP Helper-Address on Cisco Routers

Thursday, December 29th, 2011

In a prior lab, Setting-up DHCP on Cisco Routers, I discussed how to setup a Cisco router as a DHCP server. In this lab, I use a DHCP server setup on one subnet to provide DHCP services to two different subnets. For this lab I use a Cisco 2126XM router [IOS Version 12.2(28)] as the layer 3 device and two Cisco WS-C2950-24 switches [IOS Version 12.1(22)EA4X] as the layer 2 devices. The network diagram and DHCP server configuration for this lab is shown below. (more…)


Setting-up DHCP on Cisco Routers

Sunday, December 11th, 2011

The Dynamic Host Configuration Protocol (DHCP) provides the capability to automatically allocate reusable network addresses and configuration options to hosts. (more…)