Friday, March 21, 2008

eBGP and iBGP

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

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Saturday, October 20, 2007

OSPF route filtering and area border routers

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


Saturday, October 6, 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 effect as RIP distribute lists.  In fact, using distribute-lists within an OSPF area is dangerous.


Saturday, September 29, 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.


Saturday, September 22, 2007

OSPF stub areas and neighbor synchronization

We cover OSPF stub areas and neighbor synchronization.


Monday, July 30, 2007

OSPF Redistribution

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

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Sunday, July 15, 2007

OSPF Areas and Network Summary LSA's

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


Saturday, June 30, 2007

Introduction to OSPF

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


Sunday, June 3, 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.