Cisco Hands On Training Podcast

Cisco Hands On Training Podcast episodes:

• 03.14.2010

  IPv6 RIPng dynamic routing

  The linked video demonstrates RIPng, our first dynamic routing protocol for IPv6. This is a simple but inefficient routing protocol. The metric is based on number of router hops, with no provision for differentiating between links with drastically different bandwidth...

  
• 11.02.2009

  IPv6 Static Routing

  In this hands-on exercise, we configure IPv6 addresses on 3 routers in a triangle. Then we configure IPv6 static routes to allow the 6 IPv6 subnets (3 loopback, 3 P2P links) to be accessible on all 3 routers.Static routes are...

  
• 09.27.2009

  The need for QOS versus Net Neutrality

  In 2003, I made a VOIP call from home while downloading a large email attachment. The DSL line saturated and my audio quality became horrible while VOIP packets (and email packets) were being dropped. Doubling the bandwidth to my home...

  
• 09.20.2009

  IPv6 theory

  The linked video introduces IPv6 theory. IPv6 is the 128-bit address replacement for IPv4. The Internet is expected to run out of it's 4-billion IPv4 addresses in 2012. IPv6 will replace IPv4 at the network-layer of the OSI stack. By...

  
• 05.31.2009

  IOS Version Selection Tactics

  The linked video provides guidance for optimal IOS version selection.The large number of IOS versions makes choosing the best version for your router or switch difficult. You must pick the most reliable version which includes the features you need. Different...

  
• 03.24.2009

  IOS Access Control Lists

  In this video demonstration, we show an example of writing IOS Access Control Lists (ACL's) on a home router. We use the revision control system (RCS) to maintain the master ACL file and push the ACL's to the router via...

  
• 03.23.2009

  IOS DHCP and NAT

  IOS routers can act as DHCP clients and DHCP servers. They can also function as Network Address Translation (NAT) devices. In this video we show a demonstration using a 2621 as a DHCP client, server, and NAT translation device for...

  
• 03.22.2009

  Hot Standby Router Protocol

  In this episode we show a video demonstration of the hot standby router protocol. This is a Cisco proprietary redundancy protocol. The purpose is to allow two routers to share one virtual IP address on an access subnet/vlan. Hosts on...

  
• 03.08.2009

  Rapid Spanning Tree 802.1w

  This video demonstrates layer-2 convergence in less than 2 seconds thanks to rapid spanning-tree.Rapid per-vlan spanning-tree is configured with "spanning-tree mode rapid-pvst".The rapid spanning tree protocol, 802.1w, is the answer to the slow convergence time of the historic 802.1d spanning-tree...

  
• 03.03.2009

  Etherchannels and the port aggregation protocol

  When you have two different links between the same two switches, normally spanning tree will forward on one and block on the other. This means half of your bandwidth is sitting idle. An etherchannel is a way to bind two...

  
• 03.01.2009

  VTP Vlan Trunking Protocol

  VTP is the VLAN trunking protocol. It's used to disseminate uniform vlan information between switches over 802.1q or ISL trunks. It can also "prune" vlans, dynamically removing unneeded VLANs from trunks. This decreases unneeded frame flooding.VTP can eliminate outages thanks...

  
• 02.24.2009

  802.1q and ISL trunks

  Switches can have multiple vlans. When we connect switches together we use 802.1q trunks (or older ISL trunks) to run multiple vlans over one physical link. With either trunking protocol, a tag is added to the ethernet frame with the...

  
• 02.23.2009

  Intermediate spanning tree

  We cover intermediate spanning tree concepts. The importance of specifying your root bridge and backup root bridge with spanning-tree priority. Using portfast to allow host ports to start forwarding without waiting for 30 seconds. Using bpduguard to disable portfast-enabled ports...

  
• 01.31.2009

  VLANs and spanning tree

  VLANs are a feature of ethernet switches which makes them act like multiple "virtual switches". Each VLAN is a separate broadcast domain and could be configured with a separate subnet. That way could could have separate subnets for separate purposes...

  
• 01.25.2009

  How ARP and Ethernet Work

  So far we've talked about how IPv4 encodes data into a packet, and how routers learn which direction to forward those IPv4 packets based on the destination IP address and the route table. But in the end, routers and hosts...

  
• 05.29.2008

  BGP route selection with MEDs

  In BGP, MED stands for Multi Exit Discriminator. It is a well-known optional attribute which allows one autonomous system to inject it's IGP route metrics into its BGP advertisements to another BGP autonomous system. This allows the second autonomous system...

  
• 04.11.2008

  BGP route filtering

  We filter BGP routes in 4 different ways.

  
• 03.22.2008

  eBGP and iBGP

  We put together what we learned about eBGP, iBGP, and OSPF.

  
• 03.20.2008

  iBGP

  An iBGP example with 1 autonomous system with 3 routers.

  
• 03.19.2008

  eBGP

  An eBGP example with 3 autonomous systems with 1 router each.

  
• 03.15.2008

  Introduction to BGP theory

  An introduction to BGP theory.

  
• 10.21.2007

  OSPF route filtering and area border routers

  OSPF routes should be filtered or summarized at area border routers.

  
• 10.07.2007

  OSPF distribute-list problems

  OSPF's fundamental design is that all routers in an area have the same exact view of the network topology. This is fundamentally incompatible with filtering routes within an area. As a result OSPF distribute lists do not have the same...

  
• 09.30.2007

  Totally stubby and not-so-stubby OSPF areas

  OSPF totally stubby areas and not-so-stubby areas are ways to improve OSPF scalability. But they can be very confusing.

  
• 09.23.2007

  OSPF stub areas and neighbor synchronization

  We cover OSPF stub areas and neighbor synchronization.

  
• 07.31.2007

  OSPF Redistribution

  We redistribute from RIPv2 into OSPF and introduce autonomous system boundry summary LSAs and external summary LSAs.

  
• 07.16.2007

  OSPF Areas and Network Summary LSA's

  We introduce multiple OSPF areas and network summary LSA's.

  
• 07.01.2007

  Introduction to OSPF

  We show a single area OSPF network and go into router and network link state advertisements (LSA's) in detail.

  
• 06.04.2007

  Shortest Path First Algorithm

  A brief tutorial on Dijkstra's Shortest Path First Algorithm. This algorithm is used by most link state routing protocols, including OSPF and IS-IS.

  
• 09.22.2006

  RIPv2

  RIP version 2 includes subnet information in the route advertisement. It also improves efficiency by multicasting to RIPv2 routers instead of broadcasting to all hosts.

  
• 07.25.2006

  Migrating from RIPv1 to IGRP via route redistribution

  If you run two different routing protocols in two different parts of your network, you need to redistribute routes between the two routing protocols. This session is an introduction to route redistribution by example. In production you must be cautious...

  
• 07.10.2006

  Migrating from RIPv1 to IGRP via "ships in the night" routing

  "Ships in the night" routing refers to two routing protocols which do not interact with each other. We can migrate from one routing protocol to a more believable one by simply turning on the new protocol then turning off the...

  
• 06.29.2006

  IGRP: Interior Gateway Routing Protocol

  IGRP is a Cisco-proprietary routing protocol. It is a classful distance vector protocol with a metric based on bandwidth and delay. This is superior to RIP, whose metric is based on hop-count. IGRP's classfulness makes it a bad choice for...

  
• 06.21.2006

  RIPv1 distribute lists and offset-lists

  RIP distribute lists deny specific route advertisements. RIP offset-lists increase the metric (hopcount) for specific route advertisements.

  
• 06.19.2006

  Problems with RIP Version 1

  RIP version 1 route advertisements do not include a field for the netmask. This means receiving routers have to gess the netmask based on whatever information they have available. That includes the "natural" netmask of that classful network. That also...

  
• 06.17.2006

  RIP Version 1

  RIP version 1 is a classful routing protocol. We cover the RIP packet format and configuration. We see examples of split horizon and triggered updates using the RIP debug commands.

  
• 06.13.2006

  Static routing and introduction to CEF

  Routing protocols (and static routing) update the route table. The route table is used to forward packets. Cisco Express Forwarding (CEF) is a special route table optimized to forward packets more efficiently.

  
• 06.11.2006

  Serial and ethernet point-to-point links

  We cable and configure ethernet and synchronous serial point-to-point links. In the next session these will be the "legs" of our triangle.

  
• 06.08.2006

  Classful IP addressing

  Routers route packets based on the destination IP address: a 32-bit number included in the header of every IP packet. Historically, "large" sites were allocated IP address blocks starting with 0 (binary). Medium sites were allocated address blocks starting with...

  
• 06.03.2006

  Cisco 2500 password recovery

  Every network engineer needs to be able to deal with a router with an unknown password. Whether you are taking over a site where the previous engineer was "hit by a bus", or scrounging routers from the storage closet, good...

  
• 06.02.2006

  Scrounging Cisco Gear and Using the Console

  You can best take advantage of the Cisco training podcast series by getting routers and following along. First you need to scrounge or buy routers and cables. This episode helps you decide what to get. This episode also explains how...