Cisco Port Channel Monitoring

There is no Cisco MIB for etherchannel that I have found (in general -- may be something for some specific device types).  Same for other aggregates, like PPP multilink.  In our experience, the only safe way to detect aggregate issues is to monitor the reported speed of the bundle as the underlying link does NOT necessarily need to be down for an aggregate to lose members (seen it happen when carriers do testing and fail to put the member back into the  bundle). Unfortunately, despite previous requests, the interface datasource still does not report ifSpeed so you cannot set a threshold on that datapoint to detect out-of-spec speeds.