Category Archives: Knowledge Base

Configuring MPLS L2 – Base/lab config

This example is how to configure basic Layer 2 MPLS connectivity across your MPLS core, so CE endpoints, or in some cases, ToR switches can appear to be layer 2 adjacent, through your core.  This is primarily used on the service provider side but has amazing uses for the data center end of things.  Being… Read More »

Useful Curl command

Ever write an F5 iRule and need to test it against a test VIP but you need to pass the hostname without wanting to update your host file and use a traditional browser?  Well curl to the rescue.  See below: curl -v -H “Host:” This has the added benefit of giving you header… Read More »

OSPF Neighbor Relationships

In this post, we will discuss the components involved with OSPF Neighbor Relationships.  This is not a configuration guide but should be used as a reference for various OSPF states and concepts that the OSPF protocol goes through to establish connections to its neighbors. Determine your own Router ID.  The router ID identifies the router… Read More »

OSPF Area Design and Terms

Here are some core concepts that go into understanding OSPF.  This is the number one IGRP in the world so it worth taking time to understand a few of these fundamental principles. The three tables used are the Neighbor table, the Topology table, and the Routing table. All routers must connect to Area 0.  Routers… Read More »

AnyConnect 4.5

Hi all, I have not utilized this blog in a long time.  My career has advanced to a point where I am working with primarily CCNP/CCIE level technology and automation with Python (Networking/DevOps).  I will begin posting more as I continue my studies in this area.  In the meantime, allow me to start up this… Read More »

Category: VPN

AnyConnect 4.0 Released

The latest AnyConnect clients have been released from Cisco, version 4.0.00048.   The following Operating Systems are no longer supported in this latest release, so be careful before downloading or deploying these: Windows Vista and XP Mac OS X 10.6 Ubuntu 9, 10, 11 RHEL 5.x All Linux 32-bit platforms— As of AnyConnect 4.0, Linux… Read More »

Exploring vPCs and their verification

Virtual Port Channels (vPCs) allow you to ether channel or bundle multiple ports to the different devices.  Since the 7k/5k devices are looked at as one big virtual device, you can now use ether channel or load balancing and redundancy between multiple Nexus switches. vPC Peers are the bundled devices that act as one single… Read More »

Using ACLs in NX-OS

As usual, the same guidelines apply: You need at least one permit since there is always an implicit deny. The order matters. The global lists are first created then need to be assigned to a purpose. They will either recognize traffic and let it serve the purpose or prevent it from serving its purpose. One… Read More »