Here's the output on the Cisco side:
3750-01#show spanning-tree vlan 110
VLAN0110
Spanning tree enabled protocol rstp
Root ID Priority 4206
Address 5006.0436.8400
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 4206 (priority 4096 sys-id-ext 110)
Address 5006.0436.8400
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300 sec
Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Fa3/0/46 Desg FWD 200000 128.162 P2p
Fa3/0/47 Back BLK 200000 128.163 P2p
I have highlighted the interface that trunks to the Juniper switches. The Juniper switch shows the port is forwarding and is a root port.
root@EX-01> show spanning-tree interface
Spanning tree interface parameters for instance 0
Interface Port ID Designated Designated Port State Role
port ID bridge ID Cost
... [output removed as unecessary]
ge-0/0/10 128:500 128:500 32768.9ccc83ac7a71 20000 FWD DESG
ge-0/0/11 128:501 128:163 4097.500604368400 200000 FWD ROOT
ge-0/1/0 128:502 128:502 32768.9ccc83ac7a71 20000 FWD DESG
Ports ge-0/0/10 & ge-0/1/0 are the redundant uplinks to the other EX switch.