When connecting SRX and QFX5110 with 1G link using fiber SFP, the physical interface is down on SRX. However, the interface is up QFX5110.
SRX345(ge-0/0/9)------------(ge-0/0/10)QFX5110
[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
{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