iBGP Scalability – Route Reflection

As previously discussed, the use of BGP between multiple BGP speakers within a single AS requires a full mesh of peerings.  If there are limitations within the network that do not allow the routers to be fully meshed then one workaround to accommodate for BGP scalability is the use of BGP [...]

BGP Synchronization Rule

BGP Synchronization Scenarios

The use of BGP on multiple routers within a single Autonomous System presents complications in configuration due to the fact that internal BGP has no loop prevention mechanism.  To review; BGP uses AS-Path as its loop prevention mechanism.  Network reachability information received from an eBGP peer is sent with [...]

BGP Part 1

BGP Scenario Startup Configs
.NET Scenario File
Introduction to BGP – Slides
BGP can be classified as a path vector routing protocol.  In a brief review of IGP dynamic routing protocol classifications, you may remember that distance vector routing protocols have the following characteristics:

Pass full routing tables
Directly connected neighbors
Hop count as a metric
Time based updates
Routes are understood from [...]

Unicast Reverse Path Forwarding

Tier-2 Explanation:  As a mechanism for mitigating Denial of Service attacks, Unicast Reverse Path Forwarding (uRPF) comes in two flavors.  The first and original implementation was uRPF strict mode.  In this mode, uRPF is configured on the interface and verifies that any packet coming in the interface is sourced from a known route within the [...]

DRP

Tier-2 Explanation: Gap analysis on this topic was a zero.  The DistributedDirector feature set/Application is new to me and will require more research to achieve Tier-3 understanding.
The Director Response Protocol (DRP) is used by the DistributedDirector application to query DRP Servers for EGP/IGP metric information.  With the information gathered, the Director is able to respond [...]

Mobile IP – Introduction

These are my notes on the topic.  I’ve never configured this before…

Mobile IP is comprised of three device types:
Mobile Node (MN): A device that can change it network location from one subnet to another. This device is able to maintain communications while maintaining it’s home IP.
Home Agent (HA): A router on the home network of [...]

Pull your head out of your 1000BASE-T SFP’s.

…verify interconnect configurations and give the implementation engineers the peace of knowing they can dispatch a device for install and know that it will come up.

Intro to Network Address Translation

IOS 12.2-> Configuration Guides-> IP Configuration Guide-> IP Addressing & Services-> Configuring IP Addressing
Network Address Translation (NAT) has become de facto method of maintaining private address space for internal enterprise/campus configuration while also conserving the rapidly diminishing public IPv4 address space.
This article will focus on the configuration guidelines for tier-2 understanding of NAT.
NAT Terminology:
Inside-Local: An [...]

Configuration Change Notification and Logging

OS 12.4->Configuration guides-> IOS Configuration Guide->Managing configuration files->Configuration Change Notification and Logging
This feature tracks changes made to the running configuration. The main component that provides this functionality is the configuration log.
For each configuration command that is executed, the following information will be logged:
•The command that was executed
•The configuration mode in which the command was executed
•The [...]