11-18-2013 07:16 AM - edited 03-04-2019 09:36 PM
Dear friends
I know about how the routers distinguish between classful and classless address. But I could not find how the router calculates the path when forwarding packets.
I know fact like
Consider scenario like
LAN -> Router-A <------> Router-B -> LAN
(172.16.0.0/16) (192.168.1.0/30) (172.20.0.0/24)
Please specify how routers calculate/find route when forwarding packets between lans in Router-A's LAN interface and Router-B's LAN interface.
Assuming router is being configured with RIP.
What about when we configure the same with OSPF and please mention how router in both cases use routing table to forward those packets.
In short, What going inside routers brain when forwarding packets and how routers behave when there is RIP and when there is OSPF.
Frankly I know the rules but I could not understand fundamentals like
Sometimes even forwarding to default gateway fails when configured with classful behavior. Why?
Please help My total fundamentals is shaken with this wierd.
I WANT TO BE CONFIDENT IN HOW AND WHEN ROUTERS COULD AND COULD NOT FORWARD PACKETS.
PLEASE SOME HELP WITH SOME PERFECT EXPLANATIONS AND EXAMPLES WITH ALL CLASS OF NETWORK IN ONE EXAMPLE IF POSSIBLE.
11-18-2013 04:53 PM
Vishal,
Have a look through this cisco pdf
Regards,
Alex.
Please rate useful posts.
11-18-2013 06:05 PM
Hi Mr A Campbell
Thanks for good reference manual. But can you please provide me with some good example and probably with route summarization and classful protocols behaviour thereby.
Hope one example is lot better than reading 100 books or so..
Thanks
11-18-2013 06:31 PM
Hope one example is lot better than reading 100 books or so..
LOL!
Alex is not recommending you read 100 books. He's recommending you to read just ONE file.
You might as well just tell Alex "Can you please summarize it in 200 words or less so my professor/instructor can give me an A+".
11-20-2013 03:04 AM
Dear Leo Laohoo
I need one example which shows the classful and classless behavior of routing protocols.
1. But probably one with discontiguous network in between two same class of network (This is normal example of this type of case)
2. Another one with example containing same class network but with several different masks but two WANS connected must also be of same class of network.
Can someone please provide a solid example
11-20-2013 03:37 AM
Vishal,
Take the time to read Alex's PDF file.
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