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You are here: Home / Juniper / EX9200-40T auto negotiation behavior with 10/100M box

EX9200-40T auto negotiation behavior with 10/100M box

June 2, 2016 by James Palmer

EX9200 auto negotiation behavior with default configuration
When EX9200 is connected to a device which supports only 100M (such as any legacy box), the link will not come up without any auto negotiation configuration

The cause of this issue is because EX9200 works in tri mode auto negotiation.
[working case (config speed explicitly)]

lab@Jazz# run show interfaces terse | match ge-2/0/1 
ge-2/0/1 up up

[edit]
lab@Jazz# show interfaces ge-2/0/1 | display set 
set interfaces ge-2/0/1 speed 100m
set interfaces ge-2/0/1 ether-options no-auto-negotiation

NPC2(Jazz vty)# show bcm5466 registers 0 1
BCM5466 Chip Registers:
MII Control Register (0x00) : 0x2100
MII Status Register (0x01) : 0x794d
MII PHY ID 0 Register (0x02) : 0x0143
MII PHY ID 1 Register (0x03) : 0xbeb4
MII Auto-Neg Advertisement (0x04) : 0x0d01
/////////////////////////////////

[non-working case1 (no auto nego config)]
lab@Jazz# run show interfaces terse | match ge-2/0/1
ge-2/0/1 up down

[edit]
lab@Jazz# show interfaces ge-2/0/1 | display set

[edit]
lab@Jazz#

NPC2(Jazz vty)# show bcm5466 registers 0 1
BCM5466 Chip Registers:
MII Control Register (0x00) : 0x1140
MII Status Register (0x01) : 0x7949
MII PHY ID 0 Register (0x02) : 0x0143
MII PHY ID 1 Register (0x03) : 0xbeb4
MII Auto-Neg Advertisement (0x04) : 0x0c01


/////////////////////////////////

[non-working case2 (no speed option)]


[edit]
lab@Jazz# show interfaces ge-2/0/1 | display set
set interfaces ge-2/0/1 ether-options auto-negotiation

[edit]
lab@Jazz# run show interfaces terse | match ge-2/0/1
ge-2/0/1 up down


NPC2(Jazz vty)# show bcm5466 registers 0 1
BCM5466 Chip Registers:
MII Control Register (0x00) : 0x1140
MII Status Register (0x01) : 0x7949
MII PHY ID 0 Register (0x02) : 0x0143
MII PHY ID 1 Register (0x03) : 0xbeb4
MII Auto-Neg Advertisement (0x04) : 0x2c01
/////////////////////////////////

Auto-Neg Advertisement register 8bit indicate speed and duplex capability mode

0x2c01
0010 1100 0000 0001
0x0c01
0000 1100 0000 0001
0x0d01
0000 1101 0000 0001

8 bit indicate 100m FULL capability
1:100M FULL is capable
0:Not 100M FULL is capable

 

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