I have recently installed Splunk and have a spent a bit of time getting it to work with Cisco IOS devices. So here is a post of a few things I have found that may be useful to first-time Splunkers or just help make it a bit more useful.
The plan for Splunk for me is to monitor faults, track ongoing performance issues and for managing inventory. Note I have only configured this on ISR routers and switches, I haven’t tried it on any ASAs, voice gateways, servers or WLC/APs. Continue reading
Today we are going to configure an OSPF Virtual Link.
What is it?
Before we answer what it is, take a step back and look at one of the basic requirements of OSPF. That is, all areas must be connected to the backbone area (area 0). A virtual link gives us a way around that requirement.
If for some reason, you are stuck with a topology where you must connect a non-zero area via another non-zero area you can create a virtual link between the ABR in non-connected area to a router in area 0. That will hopefully make a bit more sense in a few minutes.
This post is about extending your OSPF routing domain through a VRF in a MPLS backbone. If you are unfamiliar with the MPLS side of things check the previous post out. This post only focuses on the PE/CE side of things, it assumes that a working MPLS backbone has been set up.
Then you have the choice of if you plan on using the MPLS link as a primary link or as a backup.
Here is a step by step example of how to set up a very simple MPLS-VPN. Like last time I am doing this entirely in GNS3 using 2691s running 12.4(25d).
Here is a step by step configuration example to configure a specific path using MPLS-TE tunnels.
This was originally going to be a post about MPLS Fast Reroute. However two things happened, one the post became excessively long and two, I realised none of my simulated routers support MPLS FRR. Also, the Cisco Feature Navigator is lying to me again (FRR is supported on a 6500, FN claims this isn’t so.)
Since I started networking, and more specifically working on Cisco equipment, I have been told to use copy running-configuration startup-configuration rather than the far simpler write. Continue reading