Assume I need ping from R1 to R2.
SRX1 is Primary. All necessary zones,security policies are assigned. Also two interfaces are placed into different routing-instances called VR1 and VR2.
Here the ping command from R1 to R2 will allow ! IS NOT IT ?
If SRX1 become disable, then SRX2 become primary. In that case traffic must follow via trunk between of switches (Ex2200).
Am I right ???
If I understand your question correctly, you are at least partially right. For HA failover, you'll need the same ports to have access to the same VLANs. You'll need to trunk VLANs 172 and 192 between your two EX2200 switches and you'll need to make sure both VLANs are available to SRX-1 and SRX-2.
For pings from R1 to R2, it sounds like you're trying to use VRFs which should actually keep them from talking to each other. If you want them to talk, they should be in the same routing instance.
