Juniper QFX3500, Hardware Documentation

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Channelizing Interfaces
CAUTION: Starting with Junos OS Release 18.1R1, default behaviors changed for:
•
System mode—Flexi-pic mode is replaced by non-oversubscribed mode.
•
Auto-sense—The ports auto-sense the transceiver and set the port speed to match.
The Packet Forwarding Engine on the switch is restarted when you issue system mode
changes. As a result, you might experience packet loss on the switch.
The following system modes are available on the QFX5110-32Q:
•
Default mode (from Junos OS Release 17.2R1 up to Junos OS Release 18.1R1)
All 32 QSFP+ and QSFP28 ports on the switch are configured for 40-Gigabit Ethernet only. All ports
are supported as access or uplink ports, but cannot be channelized.
•
Default mode (Junos OS 18.1R1 and later)
If you connect 40-Gbps optics to all 32 ports, only ports 1 through 18 are available to channelize to 4
independent 10-Gbps speed downstream ports. You can use the remaining ports as dedicated 40 Gbps
ports. No ports are disabled.
Depending on the optics installed, you can channelize between 18 to 20 ports.
•
If the system detects a 100-Gbps optic in any one of the QSFP28 ports (28 to 31), the port forms a
port group and disables ports 20 to 27. The 40 Gbps QSFP+ ports 0 to 19 can be channelized to 4
independent 10 Gbps speed downstream ports.
•
If the system detects 40 Gbps optics in the QSFP28 ports (28 to 31), you can channelize the 40 Gbps
QSFP+ ports 1 to 18 to 4 independent 10 Gbps speed downstream ports. You can use the remaining
ports as dedicated 40 Gbps ports. No ports are disabled.
CAUTION: Ports 20 through 27 are not be available for channelization if you have
populated the 100 Gbps QSFP28 ports with 100 Gbps optics.
•
Flexi-pic mode (from Junos OS Release 17.2R1 up to Junos OS Release 18.1R1):
•
Ports 0 through 19 of the switch are configured for 40-Gigabit Ethernet and can be channelized to 4
independent 10-Gigabit Ethernet ports.
•
Ports 20 though 27 are disabled.
•
Ports 28 through 31 are configured as 100-Gigabit Ethernet.
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