Turning off auto-negotiation did not make a difference.
Here are the show interface outputs from both sides...
Juniper
Physical interface: ge-0/0/30, Enabled, Physical link is Up
Interface index: 239, SNMP ifIndex: 590, Generation: 256
Description: ASR1 0/0/5
Link-level type: Ethernet, MTU: 9216, Speed: 1000mbps, Duplex: Full-Duplex, BPDU Error: None,
MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled, Flow control: Enabled,
Auto-negotiation: Enabled, Remote fault: Online, Media type: Fiber
Device flags : Present Running
Interface flags: SNMP-Traps Internal: 0x0
Link flags : None
CoS queues : 8 supported, 8 maximum usable queues
Hold-times : Up 0 ms, Down 0 ms
Current address: dc:38:e1:a1:5c:61, Hardware address: dc:38:e1:a1:5c:61
Last flapped : 2016-08-15 15:11:28 EDT (18:12:14 ago)
Statistics last cleared: Never
Traffic statistics:
Input bytes : 1736241 0 bps
Output bytes : 17568 0 bps
Input packets: 5238 0 pps
Output packets: 274 0 pps
IPv6 transit statistics:
Input bytes : 0
Output bytes : 0
Input packets: 0
Output packets: 0
Input errors:
Errors: 0, Drops: 0, Framing errors: 0, Runts: 0, Policed discards: 0, L3 incompletes: 0, L2 channel errors: 0,
L2 mismatch timeouts: 0, FIFO errors: 0, Resource errors: 0
Output errors:
Carrier transitions: 9, Errors: 0, Drops: 0, Collisions: 0, Aged packets: 0, FIFO errors: 0,
HS link CRC errors: 0, MTU errors: 0, Resource errors: 0
Egress queues: 8 supported, 4 in use
Queue counters: Queued packets Transmitted packets Dropped packets
0 best-effort 0 918 0
1 assured-forw 0 0 0
5 expedited-fo 0 0 0
7 network-cont 0 0 0
Queue number: Mapped forwarding classes
0 best-effort
1 assured-forwarding
5 expedited-forwarding
7 network-control
Physical interface: ge-0/0/30, Enabled, Physical link is Up
Link-level type: Ethernet, MTU: 9216, Speed: 1000mbps, Duplex: Full-Duplex, BPDU Error: None,
Auto-negotiation: Enabled, Remote fault: Online, Media type: Fiber
Link flags : None
HS link CRC errors: 0, MTU errors: 0, Resource errors: 0
Autonegotiation information:
Negotiation status: Complete
Link partner:
Link mode: Full-duplex, Flow control: Symmetric, Remote fault: OK, Link partner Speed: 1000 Mbps
Flow control: Symmetric, Remote fault: Link OK
Cisco
GigabitEthernet0/0/5 is up, line protocol is up
Hardware is 6XGE-BUILT-IN, address is f44e.0588.2d05 (bia f44e.0588.2d05)
MTU 9216 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation 802.1Q Virtual LAN, Vlan ID 1., loopback not set
Keepalive not supported
Full Duplex, 1000Mbps, link type is auto, media type is SX
output flow-control is on, input flow-control is on
ARP type: ARPA, ARP Timeout 04:00:00
Last input 18:13:43, output 00:00:13, output hang never
Last clearing of "show interface" counters never
Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
926 packets input, 58833 bytes, 0 no buffer
Received 908 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 13 multicast, 0 pause input
6541 packets output, 1825630 bytes, 0 underruns
0 output errors, 0 collisions, 16 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out
Speed and duplex both match up. The stats show some input/output but no errors.