Route

Advertising a Default Route Into EIGRP

2014-07-06 ·4 min read

Let’s get an IPv4 default route into EIGRP. There are a few methods to do it. I hate most of them, though. I think it will be obvious which one I like. Here’s the lab I have set up to test …

default eigrp route

EIGRP Redistribution - Default Metrics of Connected and Static Routes

2014-06-19 ·5 min read

I wanted to do some analysis of the EIGRP topology table last night, so I fired up a small lab. I was especially interested in how external routes appear there and compare to internal entries. Like …

connected eigrp redistribute redistribution route static topology

Junos Basics - Routing Instances

2012-11-01 ·3 min read

Here’s one that I use every day at work. We have multiple customers coming into the same router, and, as luck would have it, they all use 192.168.1.0/24 (OK…not really but it might …

instance juniper junos route routing table vrf

OSPF and Loopback Interfaces

2011-07-31 ·3 min read

I was studying via Google+ Hangout the other day with CJ and Rob, and one of the topics that came up was that OSPFv2 advertises all loopbacks as 32-bit no matter what the configured mask is. I rarely …

ipv6 loopback ospf ospfv2 ospfv3 route

Redistribution Notes - Tagging

2011-06-20 ·2 min read

Tagging provides a way to mark common or similar routes to manipulate later. In redistribution scenarios with mutual redistribution on two different routers, any routes that gets redistributed from …

350-001 ccie notes redistribution route tag written

BGP Notes - Route Reflectors

2011-06-11 ·1 min read

Route reflectors remove the requirement of having a full mesh iBGP network. Any iBGP route a router reflector learns is sent to all route reflector clients. Non-client iBGP neighbors do not get the …

350-001 bgp ccie reflector route written

EIGRP Notes - Route Filtering

2011-06-07 ·1 min read

As always, correction are encouraged. You can configure an EIGRP router to filter routes from being advertised or from being accepted. Objective: Filter out the route to 10.0.254.1/32 from being …

350-001 ccie eigrp filtering notes route

Routing IPv6 with BGP - The Basics

2011-02-10 ·6 min read

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 …

address-family as bgp ipv6 mpbgp multiprotocol neighbor remote-as route router-id unicast

OSPFv3 - The Basics

2011-02-01 ·3 min read

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 …

area config example ipv6 ospf ospfv3 route router-id

Tagging External Routes in EIGRP

2010-12-03 ·2 min read

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.

bgp egp eigrp external igp ospf redistribution route routing tag