Calculate max no. of OSPF routers on a single area, based on Processing Power and Memory and Prefixes?

[George-Sl]

Hi,

How to calculate the maximum number of ospf routers in a single area base on memory and processing power and number of prefixes? and ofc how to estimate the propagation delay based on processing power and number of prefixes and link speed? and how much is acceptable?

And how much memory is being allocated by each ospf prefix? I know allocation is based on LSAs not prefixes but I mean an estimation of occupied memory per prefix.

Thx a lot

[balaji.bandi · Accepted solution]

look at the below document to start with :

http://www.ciscopress.com/articles/article.asp?p=1763921&seqNum=6

you also need a consultant to SE to understand more deeply and calculate.

Some times its ongoing Lifecycle based on the inputs and analysis.

[Deepak Kumar · Accepted solution]

Hi,

It is an estimate idea based on the LSA type and flooding amount based on Device CPU, Memory and mostly of your network planning and design. As many Cisco documents, anyone router should have no more than 55 - 60 neighbors and an area should have no more than 45 - 50 routers. Areas that suffer with unstable links should be smaller.

Really, I am not sure how much memory needed for LSA and I gone through the many artical and books, didn't find any answer.