Latest Ospf Podcast Episodes
IPv6 RIPng dynamic routing
Cisco Hands On Training Podcast - March 14, 2010 04:22 - Video ★★★★ - 72 ratingsThe 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 (a frame-relay hop has the ...
IPv6 Static Routing
Cisco Hands On Training Podcast - November 02, 2009 01:44 - Video ★★★★ - 72 ratingsIn 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 easy to understand. At first glance they appear simple. You just ma...
The need for QOS versus Net Neutrality
Cisco Hands On Training Podcast - September 27, 2009 03:19 - Video ★★★★ - 72 ratingsIn 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 would not have solved this problem. The email download woul...
IPv6 theory
Cisco Hands On Training Podcast - September 20, 2009 05:42 - Video ★★★★ - 72 ratingsThe 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 replacing one layer in the stack, most applications and mos...
IOS Version Selection Tactics
Cisco Hands On Training Podcast - May 31, 2009 04:11 - Video ★★★★ - 72 ratingsThe 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 IOS "packages" have different featu...
IOS Access Control Lists
Cisco Hands On Training Podcast - March 24, 2009 04:47 - Video ★★★★ - 72 ratingsIn 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 TFTP. This is similar to many production networks, where maintaing comments...
IOS DHCP and NAT
Cisco Hands On Training Podcast - March 23, 2009 04:42 - Video ★★★★ - 72 ratingsIOS 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 my home network. It's important to understand that most IOS rout...
Hot Standby Router Protocol
Cisco Hands On Training Podcast - March 22, 2009 04:36 - Video ★★★★ - 72 ratingsIn 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 the subnet can use the virtual IP for their default route. ...
Rapid Spanning Tree 802.1w
Cisco Hands On Training Podcast - March 08, 2009 04:57 - Video ★★★★ - 72 ratingsThis 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-t...
Etherchannels and the port aggregation protocol
Cisco Hands On Training Podcast - March 03, 2009 05:35 - Video ★★★★ - 72 ratingsWhen 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 links into one logical link with twice the bandwidth. In addition to incre...
VTP Vlan Trunking Protocol
Cisco Hands On Training Podcast - March 01, 2009 23:14 - Video ★★★★ - 72 ratingsVTP 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 to the uniform V...
802.1q and ISL trunks
Cisco Hands On Training Podcast - February 24, 2009 02:17 - Video ★★★★ - 72 ratingsSwitches 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 vlan information. ISL is an older Cisco-proprietary trunking...
Intermediate spanning tree
Cisco Hands On Training Podcast - February 23, 2009 03:49 - Video ★★★★ - 72 ratingsWe 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 where someone...
VLANs and spanning tree
Cisco Hands On Training Podcast - January 31, 2009 17:33 - Video ★★★★ - 72 ratingsVLANs 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 (IT, accounting, network management) on one p...
How ARP and Ethernet Work
Cisco Hands On Training Podcast - January 25, 2009 05:22 - Video ★★★★ - 72 ratingsSo 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 need to encode the IPv4 packet onto a physical medium. Examples of physic...
BGP route selection with MEDs
Cisco Hands On Training Podcast - May 29, 2008 05:42 - Video ★★★★ - 72 ratingsIn 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 to make intelligent routing decisions...
BGP route filtering
Cisco Hands On Training Podcast - April 11, 2008 05:56 - Video ★★★★ - 72 ratingsWe filter BGP routes in 4 different ways.
eBGP and iBGP
Cisco Hands On Training Podcast - March 22, 2008 05:51 - Video ★★★★ - 72 ratingsWe put together what we learned about eBGP, iBGP, and OSPF.
iBGP
Cisco Hands On Training Podcast - March 20, 2008 05:49 - Video ★★★★ - 72 ratingsAn iBGP example with 1 autonomous system with 3 routers.
eBGP
Cisco Hands On Training Podcast - March 19, 2008 05:48 - Video ★★★★ - 72 ratingsAn eBGP example with 3 autonomous systems with 1 router each.
Introduction to BGP theory
Cisco Hands On Training Podcast - March 15, 2008 05:46 - Video ★★★★ - 72 ratingsAn introduction to BGP theory.
OSPF route filtering and area border routers
Cisco Hands On Training Podcast - October 21, 2007 05:45 - Video ★★★★ - 72 ratingsOSPF routes should be filtered or summarized at area border routers.
OSPF distribute-list problems
Cisco Hands On Training Podcast - October 07, 2007 05:41 - Video ★★★★ - 72 ratingsOSPF'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 effect as RIP distribute lists. In fact, using distribute-l...
Totally stubby and not-so-stubby OSPF areas
Cisco Hands On Training Podcast - September 30, 2007 05:39 - Video ★★★★ - 72 ratingsOSPF totally stubby areas and not-so-stubby areas are ways to improve OSPF scalability. But they can be very confusing.
OSPF stub areas and neighbor synchronization
Cisco Hands On Training Podcast - September 23, 2007 05:35 - Video ★★★★ - 72 ratingsWe cover OSPF stub areas and neighbor synchronization.
OSPF Redistribution
Cisco Hands On Training Podcast - July 31, 2007 05:33 - Video ★★★★ - 72 ratingsWe redistribute from RIPv2 into OSPF and introduce autonomous system boundry summary LSAs and external summary LSAs.
OSPF Areas and Network Summary LSA's
Cisco Hands On Training Podcast - July 16, 2007 05:31 - Video ★★★★ - 72 ratingsWe introduce multiple OSPF areas and network summary LSA's.
Introduction to OSPF
Cisco Hands On Training Podcast - July 01, 2007 05:29 - Video ★★★★ - 72 ratingsWe show a single area OSPF network and go into router and network link state advertisements (LSA's) in detail.
Shortest Path First Algorithm
Cisco Hands On Training Podcast - June 04, 2007 05:26 - Video ★★★★ - 72 ratingsA brief tutorial on Dijkstra's Shortest Path First Algorithm. This algorithm is used by most link state routing protocols, including OSPF and IS-IS.
RIPv2
Cisco Hands On Training Podcast - September 22, 2006 05:25 - Video ★★★★ - 72 ratingsRIP version 2 includes subnet information in the route advertisement. It also improves efficiency by multicasting to RIPv2 routers instead of broadcasting to all hosts.
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