Combo Ports 25 To 28 - Allied Telesis AT-9000 Series User Manual

Chapter 1: AlliedWare Plus Command Line Interface

Combo Ports 25 to 28

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Ports 25 to 28 on the AT-9000/28, AT-9000/28POE, and AT-9000/28SP
Managed Layer 2 ecoSwitches are combo ports. Each combo consists of
one 10/100/1000Base-T port and one SFP slot. The twisted pair ports
have the letter R for Redundant as part of their port numbers on the front
faceplates of the units.
Here are the guidelines to using these ports and slots:
Only one port in a pair — either the twisted pair port or the companion

SFP module — can be active at a time.
The twisted pair port is the active port if the SFP slot is empty, or if an

SFP module is installed but does not have a link to a network device.
The twisted pair port automatically changes to the redundant status

mode when an SFP module establishes a link with a network device.
A twisted pair port automatically transitions back to the active status

when a link is lost on an SFP module.
A twisted pair port and an SFP module share the same configuration

settings, including port settings, VLAN assignments, access control
lists, and spanning tree.
The only exception to shared settings is port speed. If you disable

Auto-Negotiation on a twisted pair port and set the speed and duplex
mode manually, the speed reverts to Auto-Negotiation when an SFP
module establishes a link with an end node.
Note
These guidelines do not apply to the SFP slots on the AT-9000/52
Managed Layer 2 ecoSwitch.