Ranked #1
VLANs and spanning tree
VLANs and spanning tree
VLANs are a feature of ethernet switches which makes them act like multiple "virtual switches". Each VLAN is a separate... Read more
31 Jan 2009
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Ranked #2
Rapid Spanning Tree 802.1w
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... Read more
8 Mar 2009
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Ranked #3
OSPF Areas and Network Summary LSA's
OSPF Areas and Network Summary LSA's
We introduce multiple OSPF areas and network summary LSA's.
16 Jul 2007
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Ranked #4
BGP route selection with MEDs
BGP route selection with MEDs
In BGP, MED stands for Multi Exit Discriminator. It is a well-known optional attribute which allows one autonomous syst... Read more
29 May 2008
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Ranked #5
eBGP and iBGP
eBGP and iBGP
We put together what we learned about eBGP, iBGP, and OSPF.
22 Mar 2008
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Ranked #6
VTP Vlan Trunking Protocol
VTP Vlan Trunking Protocol
VTP is the VLAN trunking protocol. It's used to disseminate uniform vlan information between switches over 802.1q or IS... Read more
1 Mar 2009
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Ranked #7
RIPv2
RIPv2
RIP version 2 includes subnet information in the route advertisement. It also improves efficiency by multicasting to RI... Read more
22 Sep 2006
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Ranked #8
Migrating from RIPv1 to IGRP via route redistribution
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 betwe... Read more
25 Jul 2006
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Ranked #9
OSPF route filtering and area border routers
OSPF route filtering and area border routers
OSPF routes should be filtered or summarized at area border routers.
21 Oct 2007
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Ranked #10
OSPF stub areas and neighbor synchronization
OSPF stub areas and neighbor synchronization
We cover OSPF stub areas and neighbor synchronization.
23 Sep 2007
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Ranked #11
Totally stubby and not-so-stubby OSPF areas
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.
30 Sep 2007
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Ranked #12
Intermediate spanning tree
Intermediate spanning tree
We cover intermediate spanning tree concepts. The importance of specifying your root bridge and backup root bridge with... Read more
23 Feb 2009
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Ranked #13
eBGP
eBGP
An eBGP example with 3 autonomous systems with 1 router each.
19 Mar 2008
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Ranked #14
OSPF distribute-list problems
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 fund... Read more
7 Oct 2007
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Ranked #15
iBGP
iBGP
An iBGP example with 1 autonomous system with 3 routers.
20 Mar 2008
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Ranked #16
Introduction to OSPF
Introduction to OSPF
We show a single area OSPF network and go into router and network link state advertisements (LSA's) in detail.
1 Jul 2007
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Ranked #17
Shortest Path First Algorithm
Shortest Path First Algorithm
A brief tutorial on Dijkstra's Shortest Path First Algorithm. This algorithm is used by most link state routing protoco... Read more
4 Jun 2007
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Ranked #18
Etherchannels and the port aggregation protocol
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... Read more
3 Mar 2009
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Ranked #19
IOS Access Control Lists
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 th... Read more
24 Mar 2009
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Ranked #20
IOS DHCP and NAT
IOS DHCP and NAT
IOS routers can act as DHCP clients and DHCP servers. They can also function as Network Address Translation (NAT) devic... Read more
23 Mar 2009
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