Category: route

OSPF and Loopback Interfaces

I was studying via Google+ Hangout the other day with CJ and Rob, and one of the topics that came up was the idea of OSPFv2 advertising all loopbacks as 32-bit no matter what the configured mask is. I rarely use loopbacks outside of a lab and had no idea, so I set up a quick lab to see for myself. Sure enough! That’s exactly what I saw.

Routing IPv6 with BGP – The Basics

Are you sensing a theme lately? Since we covered the basics of the main IGPs (I’m an enterprise guy, so no IS-IS comments, please.), I thought I’d try to describe the basics of advertising IPv6 routes over BGP. Yet again, we’re not going to do any route manipulation or change any of the 948284928 BGP attributes. We’re just trying to get routes exchanged.

OSPFv3 – The Basics

A few hours ago, the last of the IPv4 addresses were allocated by IANA. Now’s the time to learn more about IPv6! Yesterday, I posted about EIGRP for IPv6, so I think I’ll continue the trend by introducing OSPFv3, which is the IPv6 implementation of OSPF

EIGRP for IPv6 – The Basics

I’m not going to go all out like Jeremy over at has, but I’m going to start to discuss a few IPv6 topics. In time (like in September when APNIC runs out of IPv4 addresses), I’m sure I’ll ramp up the IPv6 talk, but let’s start easy and get EIGRP for IPv6 up and running.

Tagging External Routes in EIGRP

EIGRP allows you to tag external routes.  That is, any route redistributed into EIGRP can be tagged with a numeric descriptor from 0 to 4294967295. Aaron ConawayI shake my head around sometimes and see what falls out. That’s what lands…