First the info from traps and syslog don't fully overlap. Traps for example are easier to parse for events like link down because you get the iftype and ifname in the trap to filter on. Where as syslog is useful for events where there is no corresponding trap.
There is no equivalent syslog msg that I know of for SNMP traps but there are in the cases of routers and switches syslog traps. With EEM you could set up whatever you want but probably for only a limited subset of devices.
In my many years of doing this I say you should use both otherwise you will miss some notifications. Many event managers like Netcool will allow you to setup deduplication too if you don't want the same incident annunciated more than once.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...