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And you have only one Cisco or Juniper Product knowledge.
The best way to resolve issues between multivendor devices is to do a packet capture and log messages which appear in your syslog server or device logs.
You can capture the traffic by setting up SPAN/RSPAN or port mirroring for the ports where Cisco and Juniper devices are connected, when you are setting up IPSEC tunnel or using it.99% of the times, you can resolve IPSEC tunnel issues by checking and googling the logs which appear during IPSEC setup, be aware that if you want debugs, then it is not a good idea for devices in production.
Hope I answered your question.
