Re: Router-on-a stick Cisco Router with Juniper Switch

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.