Modular IOS was an idea to build separate software modules so for instance, if an upgrade is needed for something related to CDP, instead of having to upgrade the whole IOS you could just "patch" the CDP portion which actually prevents a reload on the whole box. This has not advanced that much so you can stick with the normal IOS.
SSO is the prefered supervisor redundancy method mainly due to its speed when doing a sup switchover, it takes less than 3 seconds and the standby supervisor is ready (full MAC tables and configurations). the problem is with the routing protocols (and some other layer3 features) because upon a switchover, the protocols must re-converge and that usually takes a little longer. Here is when NSF comes into play, if it is being used, a routing protocol like OSPF can converge a lot faster if you are using NSF-capable devices.
SRM/SSO is just the regular stateful switchover mode and in my opinion it's a lot better than RPR+ and I'm talking about "speed" because at the end is what we want from a supervisor redundancy protocol
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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