Interface speed specifications on MX series routers

This article outlines the ethernet interface speed specifications on MX series routers.

M series and T series routers that have gigabit ethernet interfaces are not capable of supporting a speed of 10M or 100M. They always default to 1000M (1gig)
On MX series routers however, the speed can be set to 10/100/1000 by using the command

set interfaces <int> speed <10/100/1000>

The above only works for copper based (UTP) DPCs/FPCs on the MX series routers. Other DPCs that are SFP based will not support anyother speed than 1000M or 10gig

Examples of UTP based DPCs:
DPCE-R-40GE-TX
DPCE-X-40GE-TX

Examples of SFP based DPCs:
DPCE-R-40GE-SFP
DPCE-X-Q-40GE-SFP
DPCE-R-Q-40GE-SFP
DPCE-R-2XGE-XFP

About the author

James Palmer

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