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Posts Tagged ‘OSPF’

Improving the Routing Table in an OSPF Network

posted in Cisco Networking
by on December 1st, 2011 tags: , ,

OSPF Network

The topology above is an example network, consisting of four OSPF areas (one backbone, area 0) and one external EIGRP area. I’ve set up an IP addressing scheme using 10.0.0.0/8 for OSPF and 172.16.0.0/12 for EIGRP. In case you didn’t notice, the second part of the IP address is the same as the area number (10.x.0.0 for area x).

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Basic IPv6 Routing

posted in Cisco Networking, Technical
by on May 10th, 2010 tags: , , , , ,

The purpose of this article is to discuss and compare different methods of routing in IPv6. In particular, we will cover configuration of static routing with IPv6, RIPng, OSPFv3, IS-IS for IPv6,  Multi-protocol BGP, and EIGRP. We will also go over the application of some basic troubleshooting commands, including show commands.

To begin, we will use the below topology.

Basic IPv6 Routing

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MPLS VPN Challenge

posted in Cisco Networking, Technical
by on January 23rd, 2010 tags: , , , , , , ,

I spent some time using GNS3 to build out a 3 router lab focusing on a single customer MPLS VPN. Everything went fine initially, OSPF came up, BGP with route reflectors were fine, LDP neighborships established, and I even saw VRF route advertisements across the network. The problem came when I tried to PING across the network on the VRF from one customer subnet to the other, I got nothing. I spent about an hour troubleshooting, looking up examples, and pulling out my imaginary hair before I figured out the problem. In this blog post I will present the lab as it was originally built for the sake of discussion and leave it up to you to figure out where I went wrong and why exactly it wasn’t working.

Here is the networking drawing as built in GNS3:

lab challenge

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