Service Provider - Half-Duplex VPN's

Service Provider – Half-Duplex VPN’s

April 7, 2013 · by · in , , ,

The other day whilst reading up on some SP topics I came across a rarely used function available on some higher end Cisco models called half duplex VRF’s (or HD VRF’s in some places).

I know it is quite a common thing to see in service provider topologies where you have a radius / virtual-template driven platform such as a DSL LNS etc but up until now I wasn’t aware that it can also be used on other platforms on regular (non virtual) interfaces.

For the demo topology I am going to use a faily simple network of three 7200′s in GNS3. According to the Cisco documentation here this feature has been around since 12.4(20)T or 12.2(33)SRC for the SR train.

In the topolgy I am using R1 and R2 to emulate customer sites which will be a member of the same VRF on R3 which will play the role of our PE.

Another one bites the dust – BGP+MPLS (642-691) PASSED!

February 25, 2011 · by · in , , , , ,

It has been some time since I last updated the blog but that isn’t to say that I haven’t been working/studying away. After finishing Internet Routing Architectures by Sam Halabi which alongside what I have learned both during my CCNP studies and whilst at my day-to-day job was going to serve as my reading to then go ahead and do the CCIP BGP exam. Before taking the BGP exam I started reading MPLS Fundamentals by Luc D Ghein and then decided that I felt that I would be comfortable enough…

MPLS QoS Marking : The rebuttal

MPLS QoS Marking : The rebuttal

February 2, 2011 · by · in , , ,

Earlier today Ivan Pepelnjak over at IOS Hints (url / @ioshints) posted a piece on his blog in which he mentioned the behaviour of MPLS QoS markings and how they don’t copy over upon label imposition at the edge-LSR (the post is here). Having only looked at this very same topic a couple of weeks ago I was almost certain that this was not the case, and so I set out to lab it out and either prove myself or Ivan wrong…. My setup for this lab is as follows:

2011 – Whats to come?

January 2, 2011 · by · in , , ,

I thought I would join every man and his dog and write either a 2010 recap or a 2011 prediction post. Over the past 12 months I have began and completed my CCNP certification and now have that certification bug that I swear should be a medical condition, the only way to cure it is to get yet more exams done! Some of my goals for 2011 may be a little farfetched however some are easily obtainable.