When connecting SRX and QFX5110 with 1G link using fiber SFP, the physical interface is down on SRX. However, the interface is up QFX5110.
Topology Example
SRX345(ge-0/0/9)------------(ge-0/0/10)QFX5110
On SRX345
[edit]
root@SRX345-2# run show interfaces terse
Interface Admin Link Proto Local Remote
ge-0/0/0 up down
……
ge-0/0/9 up down
……
vtep up up
[edit]
root@SRX345-2# run show chassis hardware
Hardware inventory:
Item Version Part number Serial number Description
Chassis CZ3316AF0732 SRX345
Routing Engine REV 0x07 650-065042 CZ3316AF0732 RE-SRX345
FPC 0 FPC
PIC 0 8xGE,8xGE SFP Base PIC
Xcvr 9 REV 01 740-031851 PTS26Q1 SFP-SX
Power Supply 0
[edit]
root@SRX345-2# run show interfaces ge-0/0/9
Physical interface: ge-0/0/9, Enabled, Physical link is Down
Interface index: 145, SNMP ifIndex: 523
Link-level type: Ethernet, MTU: 1514, LAN-PHY mode, Link-mode: Full-duplex,
Speed: 1000mbps, BPDU Error: None, MAC-REWRITE Error: None,
Loopback: Disabled, Source filtering: Disabled, Flow control: Disabled,
Auto-negotiation: Enabled, Remote fault: Online
Device flags : Present Running Down
Interface flags: Hardware-Down SNMP-Traps Internal: 0x0
Link flags : None
CoS queues : 8 supported, 8 maximum usable queues
Current address: 30:b6:4f:2e:4d:ca, Hardware address: 30:b6:4f:2e:4d:ca
Last flapped : 2018-06-27 08:06:52 UTC (00:01:55 ago)
Input rate : 0 bps (0 pps)
Output rate : 0 bps (0 pps)
Active alarms : LINK
Active defects : LINK
Interface transmit statistics: Disabled
On QFX5110
{master:0}[edit]
root# run show interfaces terse
Interface Admin Link Proto Local Remote
ge-0/0/0 up down
ge-0/0/0.0 up down inet 2.2.2.254/24
gr-0/0/0 up up
pfe-0/0/0 up up
pfe-0/0/0.16383 up up inet
inet6
pfh-0/0/0 up up
pfh-0/0/0.16383 up up inet
pfh-0/0/0.16384 up up inet
xe-0/0/4 up down
xe-0/0/4.0 up down inet
ge-0/0/10 up up
ge-0/0/10.0 up up inet
ge-0/0/30 up down
ge-0/0/30.0 up down inet 1.1.1.12/24
ge-0/0/31 up down
ge-0/0/31.0 up down inet 1.1.1.1/24
bme0 up up
bme0.0 up up inet 128.0.0.1/2
128.0.0.4/2
128.0.0.16/2
128.0.0.63/2
---(more)---[abort]
{master:0}[edit]
root# run show interfaces ge-0/0/10
Physical interface: ge-0/0/10, Enabled, Physical link is Up
Interface index: 657, SNMP ifIndex: 638
Link-level type: Ethernet, MTU: 1514, LAN-PHY mode, Speed: 1000mbps,
BPDU Error: None, Loop Detect PDU Error: None, Ethernet-Switching Error: None,
Source filtering: Disabled
Ethernet-Switching Error: None, MAC-REWRITE Error: None, Loopback: Disabled,
Flow control: Disabled, Auto-negotiation: Disabled, Remote fault: Online,
Media type: Fiber
Device flags : Present Running
Interface flags: SNMP-Traps Internal: 0x4000
Link flags : None
CoS queues : 12 supported, 12 maximum usable queues
Current address: 5c:45:27:9e:5f:cd, Hardware address: 5c:45:27:9e:5f:cd
Last flapped : 2018-06-27 08:03:51 UTC (00:04:12 ago)
Input rate : 0 bps (0 pps)
Output rate : 0 bps (0 pps)
Active alarms : None
Active defects : None
PCS statistics Seconds
Bit errors 0
Errored blocks 0
Ethernet FEC statistics Errors
FEC Corrected Errors 0
FEC Uncorrected Errors 0
FEC Corrected Errors Rate 0
FEC Uncorrected Errors Rate 0
Interface transmit statistics: Disabled
……
Link negotiation is enabled by default on Gigabit Ethernet ports, link negotiation exchange flow-control parameters, remote fault information, and duplex information. The ports on both ends of a link must have the same setting. The link will not come up if the ports at each end of the link are set inconsistently (link negotiation enabled on one port and disabled on the other port).
By default, SRX enabled negotiation and QFX5110 disabled the negotiation. Therefore, the link of SRX is down and QFX is up as shown above.
Disable negotiation on SRX or enable negotiation on QFX to fix the issue, but to not change on both sides.
After running the following command on SRX, the issue could be resolved.
root@SRX345-2#set interfaces ge-0/0/9 gigether-options no-auto-negotiation
root@SRX345-2# commit
[edit]
root@SRX345-2# run show interfaces terse
Interface Admin Link Proto Local Remote
ge-0/0/0 up down
……
ge-0/0/9 up up
……
vtep up up
[edit]
root@SRX345-2# run show interfaces ge-0/0/9
Physical interface: ge-0/0/9, Enabled, Physical link is Up
Interface index: 145, SNMP ifIndex: 523
Link-level type: Ethernet, MTU: 1514, LAN-PHY mode, Link-mode: Full-duplex,
Speed: 1000mbps, BPDU Error: None, MAC-REWRITE Error: None,
Loopback: Disabled, Source filtering: Disabled, Flow control: Disabled,
Auto-negotiation: Disabled, Remote fault: Online
Device flags : Present Running
Interface flags: SNMP-Traps Internal: 0x0
Link flags : None
CoS queues : 8 supported, 8 maximum usable queues
Current address: 30:b6:4f:2e:4d:ca, Hardware address: 30:b6:4f:2e:4d:ca
Last flapped : 2018-06-27 08:10:02 UTC (00:03:06 ago)
Input rate : 0 bps (0 pps)
Output rate : 0 bps (0 pps)
Active alarms : None
Active defects : None
Interface transmit statistics: Disable