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CCIP

A collection of 7 posts

6to4 Tunnelling (GNS3 Lab)

6to4 Tunnelling (GNS3 Lab)

This is a quick lab to look over how 6to4 tunnelling can be implemented using GNS3 1.3 and 3725 (running c3725-adventerprisek9-mz124-15.image). The topology will be as below but the important part if the colouring of the network segments and noticing the middle/core is purely IPv4 only! Our

BGP RTBH setup using exaBGP

BGP RTBH setup using exaBGP

In this post I'll describe a basic setup using Cisco IOS, IOS XR and exaBGP that will function as a BGP remotely triggered blackhole (RTBH) allowing you to null route any source/destination prefix. The example topology will be as below: exaBGP by a very nice man called

Difference between Router Descriptor (RD) and Route Target (RT)

642-691 BGP+MPLS

Difference between Router Descriptor (RD) and Route Target (RT)

Studying towards the SPEDGE (great word Cisco!) tonight and couldn't quite define exactly Route Descriptors and Route Targets. So lets try First off it might be important (and obvious) to note both RT and RDs will only ever be configured and used on PE nodes! P and CE

642-691 BGP+MPLS

BGP Route Reflectors (GNS3 lab)

One problem of having a large number of routers running IBGP with each other in a full mesh is the volume of IBGP connections needed. The formula to see the number of connections needed for a full IBGP mesh is n(n-1)/2 so with 20 routers we would end

BGP Attributes

When BGP sends an UPDATE packet to a peer it sends path attributes associated with the prefix. These path attributes are then used by BGP to pick the best route to a destination. BGP attributes are similar to metrics in OSPF and EIGRP in the way it uses them to

QoS fields

The QoS fields used by the network device depend on the capabilities of the device and the QoS deployments of the network. Below is a little info about a few of these fields. This post will be edited over time with more info added. A table showing some of the

IP Precedence DSCP and CoS relationships

IP Precedence DSCP and CoS relationships

As part of studying the 642-642 QoS exam course is seems quite important to understand the relationship between the various ways of marking traffic. Below are some notes I've made so far about these relationships. This is note a post about the inner working of the various PHBs