Juniper has two kinds of Copper SFPs. One (SFP-1GE-T) only does Gigabit. The other one (SFP-1GE-FE-E-T) can also run at 100M and 10M respectively.
The problem is, in the chassis inventory both are identified as SFP-T:
FPC 11 REV 10 750-038489 XXXXXXXX MPCE Type 1 3D
CPU REV 04 711-038484 XXXXXXXX MPCE PMB 2G
MIC 0 REV 27 750-028392 XXXXXXXX 3D 20x 1GE(LAN) SFP
PIC 0 BUILTIN BUILTIN 10x 1GE(LAN) SFP
Xcvr 0 REV 02 740-013111 XXXXXXX SFP-T
Xcvr 1 SX 740-011782 XXXXXXX SFP-SX
Xcvr 2 SX 740-011782 XXXXXXX SFP-SX
Xcvr 3 LX 740-011783 XXXXXXX SFP-LX10
Xcvr 4 REV 02 740-013111 XXXXXXX SFP-T
Xcvr 5 REV 02 740-013111 XXXXXXX SFP-T
Xcvr 6 REV 02 740-013111 XXXXXXX SFP-T
Xcvr 7 REV 02 740-013111 XXXXXXX SFP-T
On insert we see the SFP type in the syslog:
fpc11 MIC(11/0): Link 7 Tri Rate Copper SFP - plugged in.
but except for that I know no way to distinguish these two. And after two years these logs are probably gone and noone knows the type anymore. So, is there another way?
Best Answer
Post for reference for others: The only way I know of is to log onto pfe.
MX80 Example
start shell pfe network tfeb0show sfp xAmongst Output
vs
sfp index are populated on insertion order --
show sfp listto work out your index.