At site 1, the 2 internet links are of unequal capacity & diference in BW is also more. If u do load-balancing, 1Mbps may be choked throughout the day whereas 5Mbps may not have much on it. It is better to use the 2 links in active /backup configuration using either static routes with AD in case of single ISP, or BGP if multihoming.
However on intranet, configure ospf on all routers with bandwidths as mentioned in diagram. Routing will be taken care by ospf itself. But sites 4 & 5 are a real concern bcoz they dont have a backup to DR. So in case Pri site 1 goes down, sites 4 & 5 will be isolated. I assume they are not so important sites.
There is one concern here. If u run EIGRP & OSPF simultaneously, Eigrp wins by AD & will do all routing. So AD may have to be changed for migration to have OSPF as primary routing protocol.
OSPF is a link state protocol which means every time there is fluctuation in link, there will be change in routes associated with it & these changes will be propagated throughtout the area.This would put burden on router resources viz cpu & mem. So larger the changes, higher the utilisation.
Thus it is basically for u to decide. How many networks will be in ospf, how many links, will there be any redistribution (if yes then how many networks). Is there an expected growth in future. All these factors play an important role in deciding for area configs.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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