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[QFX] Configuring 1G and 25G ports on QFX5120-48Y

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Article ID: KB35439 KB Last Updated: 07 Aug 2020Version: 2.0
Summary:

QFX5120-48Y switches are 25-Gigabit Ethernet small form-factor pluggable (SFP28) switches with 48 SFP28 ports and eight 100-Gbps quad small form-factor pluggable (QSFP28) ports. Each SFP28 port can operate as a native 25-Gigabit Ethernet port, a 10-Gigabit Ethernet port, or a 1-Gbps port based on the transceivers inserted.

However, by default, ports 0 to 47 are pre-configured to work only at 10-G speeds, and require modification of the chassis configuration to connect 1G or 25G transceivers.

This article shows how the configuration can be modified.

Symptoms:

If you try connecting an SFP-T on QFX5120-48Y, it will appear in the show chassis hardware output but not as a valid interface:

show chassis hardware                                                                                       
Hardware inventory:                                                                                                                         
Item             Version  Part number  Serial number     Description                                                                        
Chassis                                XH3719370381      JNP48Y8C-CHAS                                                                      
Pseudo CB 0                                                                                                                                 
Routing Engine 0          BUILTIN      BUILTIN           RE-QFX5120-48Y-8C                                                                  
FPC 0            REV 09   650-083242   XH3719370381      JNP48Y8C-CHAS                                                                      
  CPU                     BUILTIN      BUILTIN           FPC CPU                                                                            
  PIC 0                   BUILTIN      BUILTIN           48x25G-8x100G                                                                      
    Xcvr 0       REV 01   740-038291   I100254           SFP-T                                                                              
    Xcvr 1       REV 01   740-038291   E066957           SFP-T                                                                      
Power Supply 0   REV 04   740-070749   1F189203760       JPSU-650W-AC-AO                                                                    
Power Supply 1   REV 04   740-070749   1F189203434       JPSU-650W-AC-AO                                                                    
Fan Tray 0                                               fan-ctrl-0 0, Front to Back Airflow - AFO                                          
Fan Tray 1                                               fan-ctrl-0 1, Front to Back Airflow - A

show interfaces terse                                                                                   
Interface               Admin Link Proto    Local                 Remote                                                                    
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              <-----------No interfaces created                                                                                       
bme0                    up    up                                                                                                            
bme0.0                  up    up   inet     128.0.0.1/2                                                                                     
                                            128.0.0.4/2     
                                            128.0.0.63/2                                                                                    
cbp0                    up    up                                                                                                            
dsc                     up    up                                                                                                            
em0                     up    up   
 

Also the following messages will be logged on the switch:

Jan 19 01:04:59 jtac-qfx5120-48y-8c fpc0 CMQFX: FPC0:PIC0:PORT0 Default (10g) config on port but XCVR doesn't support 10g speed. IFD creation skipped
Jan 19 01:04:59 jtac-qfx5120-48y-8c fpc0 CMQFX: FPC0:PIC0:PORT1 Default (10g) config on port but XCVR doesn't support 10g speed. IFD creation skipped
Solution:

To convert the ports to connect 1G or 25G transceivers, use the following command from the chassis hierarchy:

[edit chassis fpc fpc-slot pic pic-slot]
user@switch# set port port-number speed speed
set chassis fpc 0 pic 0 port 0 speed 1G

show interfaces terse
Interface               Admin Link Proto    Local                 Remote
ge-0/0/0                up    up
ge-0/0/0.0              up    up   eth-switch   <-------Interface is now created.
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
ge-0/0/1                up    up
ge-0/0/1.0              up    up   eth-switch   <-------Interface is now created.
bme0                    up    up

Note: The speed configuration under the chassis can be applied only for quads (four ports) and not for single ports.

Example

set chassis fpc 0 pic 0 port 0 speed 1G   <- 0 to 3
set chassis fpc 0 pic 0 port 12 speed 1G  <- 12 to 15
set chassis fpc 0 pic 0 port 16 speed 1G  <- 16 to 19
Modification History:
2020-08-06: Minor, non-technical edit.
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