Issue with the EX4400 interface behavior:

When trying to bring up a 25G link of EX4400 connecting to the 10G link of EX4300 interface were the interface doesn't come up.

Interfaces are not coming up, and it shows “error: device xe-0/2/3 not found”.

user1@ex4400> show configuration chassis | display set

set chassis redundancy graceful-switchover

set chassis aggregated-devices ethernet device-count 8

set chassis fpc 0 pic 2 port-range 0 1 channel-speed 25g

set chassis fpc 0 pic 2 port-range 2 3 channel-speed 10g

set chassis fpc 1 pic 2 port-range 0 1 channel-speed 25g

set chassis fpc 1 pic 2 port-range 2 3 channel-speed 10g

set chassis alarm management-ethernet link-down ignore

user1@ex4400> show configuration interfaces xe-0/2/3

apply-groups TRUNK-PORT;

description connected-to-ex4300:et-0/2/3;

unit 0 {

family ethernet-switching {

vlan {

members [ J-TEST1 J-TEST2 J-TEST3 ];

}

}

}

{master:1}

user1@ex4400> show interfaces xe-0/2/3

error: device xe-0/2/3 not found

{master:1}

user1@ex4400> show interfaces et-0/2/3

error: device et-0/2/3 not found

{master:1}
user1@ex4400> show interfaces et-0/2/1show interfaces et-0/2/1
Physical interface: et-0/2/1, Enabled, Physical link is Up
Interface index: 702, SNMP ifIndex: 613
Link-level type: Ethernet, MTU: 9192, LAN-PHY mode, Speed: 25Gbps, BPDU Error: None,
Loop Detect PDU Error: None, Ethernet-Switching Error: None, MAC-REWRITE Error: None,
Loopback: Disabled, Source filtering: Disabled, Flow control: Enabled, 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: 00:00:00:00:00:00, Hardware address: 00:00:00:00:00:0C
Last flapped : 2023-05-25 18:42:54 EDT (2w3d 16:57 ago)
Input rate : 163915728 bps (6816 pps)
Output rate : 41355496 bps (1404 pps)
Active alarms : None
Active defects : None
PCS statistics Seconds
Bit errors 0
Errored blocks 0
Ethernet FEC Mode : FEC74
Ethernet FEC statistics Errors
FEC Corrected Errors 0
FEC Uncorrected Errors 0
FEC Corrected Errors Rate 0
FEC Uncorrected Errors Rate 0
PRBS Mode : Disabled
Interface transmit statistics: Disabled
 
Logical interface et-0/2/1.0 (Index 610) (SNMP ifIndex 617)
Flags: Up SNMP-Traps 0x24024000 Encapsulation: Ethernet-Bridge
Input packets : 55280
Output packets: 60373
Protocol aenet, AE bundle: ae0.0
 
user1@ex4400> show chassis hardware
Hardware inventory:
Item             Version  Part number  Serial number     Description
Chassis                                000000000055      Virtual Chassis
Routing Engine 0          BUILTIN      BUILTIN           RE-EX4400-48MP
Routing Engine 1          BUILTIN      BUILTIN           RE-EX4400-48P
FPC 0            REV 14   650-114387   000000000075      EX4400-48MP
  CPU                     BUILTIN      BUILTIN           FPC CPU
  PIC 0          REV 14   BUILTIN      BUILTIN           36x100M/1G/2.5G Base-T & 12x 100M/1G/2.5G/5G/10G Base-T
  PIC 1          REV 14   650-114387   000000000075      2x100G QSFP28 VCP
    Xcvr 0       REV 01   740-061000   00000000000UF     QSFP28-100G-CU1M
    Xcvr 2       REV 01   740-061000   000000000003F     QSFP28-100G-CU1M
  PIC 2          REV 04   650-107357   000000000028      4x25G SFP28
    Xcvr 1       REV 01   740-068639   0000000000070     SFP28-25G-BASE-SR
    Xcvr 3       REV 01   740-068639   000000000003C     SFP28-25G-BASE-SR
  Power Supply 0 REV 01   640-107109   0000000000H       JPSU-1600-C-AC-AFO
  Fan Tray 0                                             Fan Module, Airflow Out (AFO)
  Fan Tray 1                                             Fan Module, Airflow Out (AFO)
FPC 1            REV 12   650-114383   000000000055      EX4400-48P
  CPU                     BUILTIN      BUILTIN           FPC CPU
  PIC 0          REV 12   BUILTIN      BUILTIN           48x10M/100M/1G
  PIC 1          REV 12   650-114383   000000000055      2x100G QSFP28 VCP
    Xcvr 0       REV 01   740-061000   000000000003F     QSFP28-100G-CU1M
    Xcvr 2       REV 01   740-061000   00000000000UF     QSFP28-100G-CU1M
  PIC 2          REV 04   650-107357   000000000078      4x25G SFP28
    Xcvr 0       REV 01   740-068639   00000000000HY     SFP28-25G-BASE-SR
    Xcvr 3       REV 01   740-021308   0000000000U       SFP+-10G-SR
  Power Supply 0 REV 01   640-107109   00000000007       JPSU-1600-C-AC-AFO
  Fan Tray 0                                             Fan Module, Airflow Out (AFO)
  Fan Tray 1                                             Fan Module, Airflow Out (AFO)

user1@ex4400> show version

fpc0:

--------------------------------------------------------------------------

Hostname: ex4400

Model: ex4400-48mp

Junos: 22.3R2-S1.7

Per PLM EX4400 doesn’t support 10G speed on a 25G transceiver and hence the link is down. Also, different SFP's are not supported in a PIC. Same transceiver speeds should be used with a PIC.

WILL NOT WORK WITH DIFFERENT TRANSCEIVERS:

set chassis fpc 0 pic 2 port-range 0 1 channel-speed 25g

set chassis fpc 0 pic 2 port-range 2 3 channel-speed 10g

set chassis fpc 1 pic 2 port-range 0 1 channel-speed 25g

set chassis fpc 1 pic 2 port-range 2 3 channel-speed 10g

THIS WILL WORK:

set chassis fpc 0 pic 2 port-range 0 1 channel-speed 25g

set chassis fpc 0 pic 2 port-range 2 3 channel-speed 25g

set chassis fpc 1 pic 2 port-range 0 1 channel-speed 10g

set chassis fpc 1 pic 2 port-range 2 3 channel-speed 10g

Juniper documentation, https://www.juniper.net/documentation/us/en/hardware/ex4400/ex4400.pdf

You can install up to four 10GbE SFP+ transceivers or four 25GbE SFP28 transceivers in the extension module.

Do not install SFP+ transceivers and SFP28 transceivers in the extension module at the same.