It might be that there aren't enough messages yet for the scan for new nodes to pick it up. You can always configure a connector manually from Manage > Appliances > Gear on the left > Connectors. There's a Cisco IOS connector there that you can add manually (Gear > New), the logging paths match up with the local facility (e.g. local2 = /var/log/local2.log, local7 = /var/log/local7.log).
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