Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

 
 

Port Speed Overview

Learn about port speed on a device or line card, support for multiple port speed details, guidelines and how to configure the port speed.

Introduction to Port Speed

Port speed refers to the maximum amount of data that the line card transmits through a port at any given second. Port speed is measured as follows:

  • Kilobits per second (Kbps)

  • Gigabits per second (Gbps)

  • Terabits per second (Tbps)

Table 1 describes the different types of port speed configuration.

Table 2 describes the naming formats for the channelized and non-channelized interfaces.

Table 3 lists the line cards and devices, the port profile configuration, and link to the same.

Unresolved xref describes the port speed configuration at PIC Level - Chassis Hierarchy.

Unresolved xref describes the port speed configuration at Port Level - Chassis Hierarchy.

Unresolved xref describes the steps to configure the port speed for non-channelized interfaces from the [edit interfaces] hierarchy.

Unresolved xref describes the steps to configure the port speed for channelized interfaces from the [edit interfaces] hierarchy.

Table 1: Types of Port Speed Configuration

Port Speed Configuration Type

Description

PIC or MIC Level

You can configure all the ports in one PIC or MIC to operate at the same speed. For example, you can configure all the ports of a PIC that support port speed of 100 Gbps to operate at 100 Gbps speed. If you do not specify the speed by using the pic-mode statement, then the port operates in the default speed.

Port Level

You can configure each port to operate at a different speed and thus enable each port. When you configure the port speed at the port level, you have the flexibility of operating the ports of the line card at different supported speeds.

When you change the speed of a specific port in a given PIC using the speed statement, then only the speed of that port is modified. All other ports in the PIC remain unaffected. For example, you can configure four 10-Gigabit Ethernet interfaces on port 0, one 40-Gigabit Ethernet interface on port 1, and one 100-Gigabit Ethernet interface on port 2.

Interface Naming Conventions

Each interface name includes a unique identifier and follows a naming convention. When you configure the interface, use the interface name. You can either configure a port as a single interface (non channelized interface) or partition the port into smaller data channels or multiple interfaces (channelized interfaces).

When multiple interfaces are supported on a physical port, you use the colon (:) notation in the interface naming conventions as a delimiter to differentiate the multiple interfaces on a physical port. In the interface naming convention, xe-x/y/z:channel:

  • x refers to the FPC slot number.

  • y refers to the PIC slot number.

  • z refers to the physical port number.

  • channel refers to the number of channelized interfaces.

When the 40-Gigabit Ethernet interfaces (et-fpc/pic/port) are channelized as 10-Gigabit Ethernet interfaces, the interface appears in the xe-fpc/pic/port:channel format, and channel is a value of 0 through 3.

Table 2: Channelized and Non-Channelized Interface Naming Formats

Interfaces

Non-channelized Interfaces Naming Formats

Channelized Interfaces Naming Formats

10-Gigabit Ethernet Interfaces

Prefix is xe-. The interface name appears in the xe-fpc/pic/port format.

Prefix is xe-. The interface name appears in the xe-fpc/pic/port:channel format.

25-Gigabit Ethernet Interfaces, 40-Gigabit Ethernet Interfaces, 100-Gigabit Ethernet Interfaces, 200-Gigabit Ethernet Interfaces, and 400-Gigabit Ethernet Interfaces.

Prefix is et-. The interface name appears in the et-fpc/pic/port format.

Prefix is et-. The interface name appears in the et-fpc/pic/port:channel format.

What is Oversubscription?

Oversubscription occurs when you configure the speed of a port at the PIC level, and all ports that support that speed are enabled. To prevent oversubscription, you can configure the number of active ports that operate at the configured speed. Interfaces are created only for active ports. When oversubscription of Packet Forwarding Capacity is not supported, the demand on each Packet Forwarding Engine should be less than or equal to its forwarding capacity.

Supported Line Cards and Devices

Table 3 lists the line cards and devices, the port profile configuration, and link to the same.

Table 3: Supported Line Cards and Routers

Product Family

Line Card or Device

Supported Port Profile Configuration

ACX Series Routers

ACX7509-FPC-20Y

Interfaces Hierarchy

  • Channelized Interfaces

  • Non-channelized Interfaces

ACX7509-FPC-16C

Interfaces Hierarchy

  • Channelized Interfaces

  • Non-channelized Interfaces

ACX7509-FPC-4CD

Interfaces Hierarchy

  • Channelized Interfaces

  • Non-channelized Interfaces

ACX7100-48L

Interfaces Hierarchy

  • Channelized Interfaces

  • Non-channelized Interfaces

ACX7100-32C

Interfaces Hierarchy

  • Channelized Interfaces

  • Non-channelized Interfaces

ACX710

Chassis Hierarchy

  • Channelized Interfaces

  • Non-channelized Interfaces

ACX7024

Chassis Hierarchy

  • PIC level

  • Port level

ACX5448, ACX5448-D, and ACX5448-M

Chassis Hierarchy

  • PIC level

  • Port level

MX Series Routers

MPC7E-MRATE

Chassis Hierarchy

  • PIC level

  • Port level

MPC7E-10G

Chassis Hierarchy

  • PIC level

  • Port level

MIC-MRATE

Chassis Hierarchy

  • PIC level

  • Port level

MX10003 MPC

Chassis Hierarchy

  • PIC level

  • Port level

MX204

Chassis Hierarchy

  • PIC level

  • Port level

MX304

Chassis Hierarchy

  • PIC level

  • Port level

MIC-MACSEC-20GE

Chassis Hierarchy

  • PIC level

  • Port level

MPC10E-10C-MRATE

Chassis Hierarchy

  • PIC level

  • Port level

MPC10E-15C-MRATE

Chassis Hierarchy

  • PIC level

  • Port level

MX2K-MPC11E

Chassis Hierarchy

  • PIC level

  • Port level

MX10K-LC2101

Chassis Hierarchy

  • PIC level

  • Port level

MX10K-LC9600

Chassis Hierarchy

  • PIC level

  • Port level

PTX Series Routers

PTX10K-LC1201

Interfaces Hierarchy

  • Channelized Interfaces

  • Non-channelized Interfaces

PTX10001-36MR

Interfaces Hierarchy

  • Channelized Interfaces

  • Non-channelized Interfaces

PTX10K-LC1202-36MR

Interfaces Hierarchy

  • Channelized Interfaces

  • Non-channelized Interfaces

PTX10003

Interfaces Hierarchy

  • Channelized Interfaces

  • Non-channelized Interfaces