The customer needs to enable 100M on the MX204. Please clarify if it will be possible. According to https://apps.juniper.net/hct/product/?cat=Transceivers&prd=MX204 We have two transceivers with the same Part# 740-013111 compatible. CTP-SFP-1GE-T = 1000Base-T EX-SFP-1GE-T = 10/100/1000 Cooper The customer bought the transceiver with the label EX-SFP-1GE-T, but we can not bring the interface as 100M. The only way to manipulate the speed is on gigether-options stanza, which does not include the 100M option.

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labroot@MX# show interfaces xe-0/1/0| display set

Apr 12 14:14:52

set interfaces xe-0/1/0 description "mlf01.north Gig1/0/15 "

set interfaces xe-0/1/0 speed 100m

set interfaces xe-0/1/0 mtu 9100

set interfaces xe-0/1/0 gigether-options no-auto-negotiation

[edit]

labroot@MX# show chassis | display set

Apr 12 14:15:16

set chassis aggregated-devices ethernet device-count 64

set chassis fpc 0 pic 0 tunnel-services

set chassis fpc 0 pic 0 port 0 speed 40g

set chassis fpc 0 pic 0 port 1 speed 40g

set chassis fpc 0 pic 0 port 2 speed 10g

set chassis fpc 0 pic 1 port 0 speed 1G >>>>>>>

set chassis fpc 0 pic 1 port 1 speed 10g

set chassis fpc 0 pic 1 port 2 speed 10g

set chassis fpc 0 pic 1 port 3 speed 10g

set chassis fpc 0 pic 1 port 4 speed 10g

set chassis fpc 0 pic 1 port 5 speed 10g

set chassis fpc 0 pic 1 port 6 speed 10g

set chassis fpc 0 pic 1 port 7 speed 10g

set chassis network-services enhanced-ip

Output

labroot@MX# run show interfaces xe-0/1/0 extensive | grep spe

Apr 12 14:16:16

Link-level type: Ethernet, MTU: 9100, MRU: 9108, LAN-PHY mode, Speed: 10Gbps, BPDU Error: None, Loop Detect PDU Error: None,

MAC-REWRITE Error: None, Loopback: None, Source filtering: Disabled, Flow control: Enabled, Speed Configuration: Auto

labroot@MX# show interfaces xe-0/1/0| display set

Apr 12 14:19:12

set interfaces xe-0/1/0 description "mlf01.north Gig1/0/15 "

set interfaces xe-0/1/0 speed 100m

set interfaces xe-0/1/0 mtu 9100

set interfaces xe-0/1/0 gigether-options no-auto-negotiation

set interfaces xe-0/1/0 gigether-options speed 1g

[edit]

labroot@MX# run show interfaces xe-0/1/0 extensive

Apr 12 14:19:38

Physical interface: xe-0/1/0, Enabled, Physical link is Up

Interface index: 175, SNMP ifIndex: 542, Generation: 204

Description: mlf01.north Gig1/0/15

Link-level type: Ethernet, MTU: 9100, MRU: 9108, LAN-PHY mode, Speed: 10Gbps, BPDU Error: None, Loop Detect PDU Error: None,

MAC-REWRITE Error: None, Loopback: None, Source filtering: Disabled, Flow control: Enabled, Speed Configuration: 1G

Pad to minimum frame size: Disabled

 100M interface is able but using Junos Fusion, you have to inject an EX3400/EX4300 switch or eg. ACX1100 in between. It is not possible just using the MX204.