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Port Speed on SRX Series Devices

 
Summary

Learn about port speeds, support for multiple port speeds, and how to configure port speed on SRX Series devices.

SRX4600 Port Speed Overview

Table 1 presents the details of SRX4600 port speeds.

Table 1: Port Speed Details and Description

Port Location

Number and Type of Ports

Supported Speeds

FPC0, PIC0 (ports 0–3)

4 chassis cluster ports:

  • 2 fabric (FAB)

  • 2 control (CTL)

  • 10 Gbps (default)

  • 1 Gbps (only on CTL ports)

FPC1, PIC0 (ports 0–3)

4 100GbE QSFP28 ports or 40GbE QSFP+ ports

At port or PIC level:

  • 40 Gbps (default), with QSFP+ optics

  • 100 Gbps, with QSFP28 optics

FPC1, PIC1 (ports 0–7)

8 10GbE SFP+ ports

  • 10 Gbps (default)

  • 1 Gbps

Follow these guidelines when you configure the speed of a port:

  • You need to reboot the chassis cluster for configuration changes (from 10 Gbps to 1 Gbps) to take effect. For more details, see speed (Chassis Cluster).

  • To configure all 40GbE ports, use the set chassis fpc 1 pic 0 pic-mode 10G command.

  • To set only the first two 40GbE ports, use the set chassis fpc 1 pic 0 pic-mode 10G number-of-ports 2 command. This configuration sets only the first two 40GbE ports and disables the last two ports. You need to reboot the device for the configuration to take effect.

  • You can channelize each 40GbE port into four 10GbE interfaces by using QSFPP-4X10-GE optics, suitable breakout cables, and the speed configuration statement.

  • Use the speed (Gigabit Ethernet interface) configuration to set 1-Gbps speed on PIC 1 ports. 1-Gbps speed is supported only in non-autonegotiation mode. If autonegotiation mode is enabled by default at the remote end, then you must disable it.

  • You can configure the interface that is already operating in 10GbE mode to operate in 1GbE mode.

  • To prevent oversubscription, configure the number of active ports operating at the configured speed by using the number-of-ports statement. The SRX4600 supports a maximum speed of 400 Gbps; the speed cannot be oversubscribed.

  • If you try to commit an invalid configuration, the configuration gets committed, but the port is not activated. This is because Junos OS allows you to configure a port before a line card is inserted. You will get an error message in the output of the show chassis alarms command and also in the log messages. For example, if you configure four 100GbE interfaces with eight 10GbE interface, then the configuration is invalid.

  • The SRX4600 does not support copper SFP transceivers.

For information about interface-naming formats for channelized and nonchannelized interfaces and how to configure SRX Series devices at port level and PIC level, see Port Speed.

For more information about SRX4600 devices, see SRX4600 Services Gateway Hardware Guide.

For information about platforms support, see hardware compatibility tool (HCT).

To view the port speeds on each PIC, execute the show chassis pic command.

Interface Naming Conventions

Table 2 describes the interface naming convention for a 40GbE interface channelized as four 10GbE interfaces:

Table 2: SRX4600 Interface Naming Convention

Interface Type

Example

4x10GbE

When the 40GbE port et-1/0/0 is channelized into four 10GbE interfaces, the channelized interfaces are named as follows::

xe-1/0/0:0

xe-1/0/0:1

xe-1/0/0:2

xe-1/0/0:3

Supported Active Physical Ports on SRX4600 to Prevent Oversubscription

You can use the number-of-ports statement to configure a port as an active port.

Table 3 summarizes the SRX4600 active ports with number-of-ports and port speed configured at PIC level.

Table 3: SRX4600 Port Speed at PIC level

PIC

Number of Active Ports

Active Port Number at PIC Level

10-Gigabit Ethernet

40-Gigabit Ethernet

100-Gigabit Ethernet

PIC 0

0

-

-

-

1

0

0

0

2

0, 1

0, 1

0, 1

3

0, 1, 2

0, 1, 2

0, 1, 2

4

0, 1, 2, 3

0, 1, 2, 3

0, 1, 2, 3

PIC 1

0

-

-

-

1

0

-

-

2

0, 1

-

-

3

0, 1, 2

-

-

4

0, 1, 2, 3

-

-

5

0, 1, 2, 3, 4

-

-

6

0, 1, 2, 3, 4, 5

-

-

7

0, 1, 2, 3, 4, 5 ,6

-

-

8

0, 1, 2, 3, 4, 5, 6, 7

-

-

To prevent oversubscription, you can configure the maximum number of active ports that can operate at the configured speed. Table 4 summarizes the maximum number of Gigabit Ethernet ports at PIC and port levels:

Table 4: Maximum Number of Gigabit Ethernet Ports at PIC and Port Level

Port Type

Maximum Number of Ports at PIC Mode (on PIC0 and PIC1)

Maximum Ports Configurable at Port Mode (on PIC0 and PIC1)

10GbE

24

16 ports from PIC 0 and 8 ports from PIC 1.

20

Refers to 12 ports from PIC 0 and 8 ports from PIC 1.

40GbE

4

Only 4 ports from PIC 0. PIC 1 supports only 10-Gbps speed.

4

100GbE

4

Only 4 ports from PIC 0. PIC 1 supports only 10-Gbps speed.

Note: If you configure all four PIC 0 ports as 100GbE interfaces then, the PIC 1 ports are disabled. If you then try to configure any PIC 1 port and commit your configuration, the configuration will be invalid.

4

For information about oversubscription, see Port Speed.

See also