Description

Configuration changes done to interfaces that have unsupported SFPs may cause flaps for other interfaces

Symptoms

Making configuration changes for interfaces that have unsupported SFPs installed may cause flaps in other interfaces, more details below

root@switch> show chassis hardware detail no-forwarding

Hardware inventory:
Item             Version  Part number  Serial number     Description
Chassis                                YS1234567890      QFX5120-48YM-8C

    Xcvr 01      REV 01   740-013111   PRO123456789      SFP-T

SFP-T with part id : 740-013111 is not supported on QFX5120-48YM. Here is the link below for supported optics and the release for it,

https://apps.juniper.net/hct/product/?prd=QFX5120-48YM

Jul 30 23:54:03 switch : %PFE-3: fpc0 ala88e1111_reg_read: Failed (1000) to read register phy_addr 0x2c, reg 0x0 
Jul 30 23:54:03 switch : %PFE-3: fpc0 Fails in function ala88e1111_activate_link 
Jul 30 23:54:03 switch : %PFE-3: fpc0 DCBCM [ge-0/0/1]: Failed to configure power down err(1000) 
Jul 30 23:54:03 switch : %PFE-3: fpc0 DCBCM: DCBCM[ge-0/0/1]: Unable to power down the xcvr phy 
Jul 30 23:54:03 switch : %PFE-6: fpc0 DCBCM[ge-0/0/1]: Autoneg context destroyed 
Jul 30 23:54:03 switch : %PFE-6: fpc0 DCBCM[ge-0/0/1]: SFP-T phy deinited. 
Jul 30 23:54:03 switch : %PFE-6: fpc0 PFE_IFD_PIC_MISS: ms_gencfg_config_status_handler IFD/PIC not found for index 682 
Jul 30 23:54:04 switch : %PFE-6: fpc0 sfp-0/0/1 SFP plugged in 

After that other interfaces flapping:
Jul 30 23:54:08 switch bfdd[10874]: %DAEMON-5-BFDD_TRAP_SHOP_STATE_UP: local discriminator: 24, new state: up, interface: xe-0/0/10.1000, peer addr: 172.1.1.1
Jul 30 23:54:11 switch kernel: %KERN-3: pid 9373 (eventd), uid 0 inumber 461 on /.mount/var/log: filesystem full
Jul 30 23:54:12 switch bfdd[10874]: %DAEMON-5-BFDD_TRAP_SHOP_STATE_UP: local discriminator: 30, new state: up, interface: xe-0/0/11.1001, peer addr: 172.2.2.2
Jul 30 23:54:19 switch l2cpd[10862]: %DAEMON-6-LLDP_NEIGHBOR_DOWN: A neighbor of interface xe-0/0/3 has gone down. Now, this interface has 0 neighbor/s.
Jul 30 23:54:19 switch l2cpd[10862]: %DAEMON-6-LLDP_NEIGHBOR_DOWN: A neighbor of interface xe-0/0/2 has gone down. Now, this interface has 0 neighbor/s.
Jul 30 23:54:19 switch l2cpd[10862]: %DAEMON-6-LLDP_NEIGHBOR_UP: A neighbor has come up for interface xe-0/0/3. Now, this interface has 1 neighbor/s .
Jul 30 23:54:19 switch l2cpd[10862]: %DAEMON-6-LLDP_NEIGHBOR_UP: A neighbor has come up for interface xe-0/0/2. Now, this interface has 1 neighbor/s .

Solution

Please use the supported optics as below for 1gig:

SFP-1G-LX-C
Part Number: 740-011614
SFP, 1G, SMF 10km and MMF 550m, Extended Temperature (-5 through 70 DegC), Duplex LC connector
Introduced Release(s):Junos OS 22.4R1
Common Optic

SFP-1G-SX-C
Part Number: 740-011613
SFP, 1G, FDDI 220m and OM1 275m/OM2 MMF 550m, Extended Temperature (-10 through 85 DegC), Duplex LC connector
 Introduced Release(s):Junos OS 22.4R1

Modification History

2024-08-09: Initial KB