OSPF On-demand Circuits
OSPF on-demand configuration was designed for efficient operation over on-demand circuits like ISDN, X.25 switched virtual circuits (SVCs), and dialup lines. Since these are billed on usage basis, you don’t want your OSPF protocol to keep these circuits up 24-7. This feature allows OSPF to suppress periodic hellos and the periodic refreshes of LSAs are not flooded over the demand circuit.
IPv6 Summarization
August 31, 2008 by CCIETalk
Filed under IEWB Vol 2, IPV6, OSPF
I was working through IEWB Vol Lab 4 and ran across this summarization task for IPv6. I can do summarization when it comes to IPv4 but I was kind of sketchy on IPv6 summarization. Well I attempted the task and was close to say the least. So after I went through the whole task and got the details behind how it works, I thought why not post this here so others can benefit from it.
OSPF is done! Here are my notes for you to drool over
Technically I was suppose to start OSPF yesterday but I started working on it over the weekend. I already went through Narbik’s soup-to-nuts labs before I attended the Bootcamp so I had some understanding about the labs. Now I have been working with the Advanced Technologies workbook for my OSPF prep. I think OSPF is one of those protocols that every Network Engineer should have a good understanding of. I have been working with OSPF for a few years now but never went into this detail before. I am actually liking the way OSPF works and I am sure once I start BGP it’s going to be a whole new world. Read more
OSPF Network Types
If you are working on OSPF then you MUST know the different network types. I have been fortunate enough to be working with OSPF for sometime now so wanted to take some time and discuss all the Network types in OSPF.
OSPF LSA Types
I was working through Narbik’s OSPF labs and ran across a few notes that I took in the class. I believe way too many network engineers get stuck when it comes to LSA types and Narbik did a great job teaching us the concepts. Here is a nice visio I did to capture the concepts! Let me know how these help you out. Let me first try to explain the different LSA types and then you can take a look at the diagram for better understanding. Read more
Narbik’s Bootcamp - Day 2
I was not able to finish all the Frame-relay labs last night so I am already behind. I think I will dedicate my Saturday & Sunday for all the leftovers. Today we covered OSPF and EIGRP with 40% lecture and 60% hands-on labs. Narbik started off with OSPF lecture and covered every single thing about OSPF you ever wanted to know. As always the starting point was that OSPF is a linkstate protocol and I thought to myself “Damn I already know that, is that why I am here?” but by the time he was done - I was like WOW! I didn’t know all this about OSPF. So we had the lecture from 9am - 3pm with a lunch break in between. At 3pm we started cranking the OSPF labs until 7pm. I was not able to finish all the labs so got some more leftovers for the weekend. I have tons of notes from the lecture that I will try to post here later on.
Narbik’s Soup-to-Nuts Workbook OSPF Lab 10
“Lab 10 - OSPF and NBMA” goes over the different OSPF network types. Broadcast, Non broadcast, point-to-point, point-to-multipoint etc. I really covered this last lab half sleeping because I have been in front of this computer for last 8 hours!!! I don’t think I can take it any more. Its 11pm and I have to get to work tomorrow morning. This was a day full of OSPF. I think this got me soaked into OSPF but I def would have to come back and revisit. I am trying to make sure that I have this whole workbook finished before I show up @ Pasadena on the 23rd 
If you can’t tell already, I am REALLY excited about that.
Narbik’s Soup-to-Nuts Workbook OSPF Lab 9
“Lab 9 - Limiting the number of OSPF redistributed routes” goes over limiting the number of redistributed routes in OSPF. Never did this before in my life and this is an interesting option. When I see something for the first time, I want to make sure I read the documentation on it. So let’s see what Cisco says about this.
Narbik’s Soup-to-Nuts Workbook OSPF Lab 8
“Lab 8 - Redirecting traffic in OSPF” goes over how to define which path a router will use to get to a path if two equal cost paths are available. We can use the “max-metric” command under the router process.
Narbik’s Soup-to-Nuts Workbook OSPF Lab 7
“Lab 7 - Filtering routes in OSPF”
One thing I have definitely learnt while working on these OSPF labs is that by default OSPF advertises loopbacks as /32 and in order for us to advertise the correct mask, we have to use ospf network type point-to-point.
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