port

Function

The port command specifies the port to be added to an ERPS ring and sets the port role.

The undo port command deletes a port from the ERPS ring and cancels the port role.

By default, ports are not added to ERPS rings, and no port roles are specified.

Format

port { interface-name | interface-type interface-number } [ rpl { neighbour | owner } ]

undo port { interface-name | interface-type interface-number }

Parameters

Parameter	Description	Value
interface-name	Specifies the interface name.	The value is a string of 1 to 63 case-sensitive characters, spaces not supported.
interface-type	Specifies the interface type.	The value is a string of 1 to 63 case-sensitive characters, spaces not supported.
interface-number	Specifies the interface number.	-
rpl	Specifies the port type to be added to an ERPS ring.	-
neighbour	Specifies the port to be added to an ERPS ring as the RPL neighbor port.	-
owner	Specifies the port to be added to an ERPS ring as the RPL owner port.	-

Views

ERPS ring view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
erps	write

Usage Guidelines

Usage Scenario

After an ERPS ring is created, run the port command to add Layer 2 ports to the ERPS ring to allow transmission of R-APS PDUs. Each device that is added to an ERPS ring is a node, and each node cannot have more than two ports being added to the ERPS ring.

ERPS defines three port roles: RPL owner port, RPL neighbor port (only in ERPSv2), and ordinary port. The link where the RPL owner port resides is the RPL.

RPL owner port
An RPL owner port is a ring port responsible for blocking traffic over the RPL to prevent loops. An ERPS ring has only one RPL owner port.
When the node on which the RPL owner port resides receives an R-APS PDU indicating that a link or node on the ring fails, it unblocks the RPL owner port to allow the port to send and receive traffic. This mechanism ensures that traffic is not interrupted.
RPL neighbor port
An RPL neighbor port is a ring port directly connected to an RPL owner port and helps reduce the number of times FDB entries are refreshed.
RPL owner and neighbor ports are both blocked under normal conditions to prevent loops.
If an ERPS ring fails, both RPL owner and neighbor ports are unblocked.
Ordinary port
Ordinary ports are ring ports other than the RPL owner and neighbor ports.
An ordinary port monitors the status of the directly-connected ERPS link and sends R-APS PDUs to inform the other ports if the link status changes.

Prerequisites

Before adding a port to an ERPS ring, ensure that:

Spanning Tree Protocol (STP) is not enabled on the port. If the port has STP enabled, run the stp disable command to disable STP.
The port is not a Layer 3 port. If the port is a Layer 3 port, run the portswitch command to switch the port to the Layer 2 mode.
The control VLAN and ERP instance have been configured using the control-vlan and protected-instance commands in the ERPS ring view.
ERPSv2 has been specified for the ERPS ring using the version v2 command if the port will be specified as an RPL neighbor port.

Configuration Impact

If any port has been added to the ERPS ring, the control VLAN cannot be changed. If the configured control VLAN needs to be deleted, run the undo port command in the ERPS ring view, and run the undo control-vlan command to delete the control VLAN.

Precautions

Before removing a port from an ERPS ring or changing the port role, run the shutdown command to shut down the port. Then remove the port or change the port role and run the undo shutdown command to enable the port. If the port is left disabled, traffic will be interrupted.

If ports added to an ERPS ring are all ordinary ports, any port on the device with the largest MAC address will be blocked.

Example

# Add GE 0/1/1 to ERPS ring 10, and set the port to the RPL owner port.

<HUAWEI> system-view
[~HUAWEI] interface GigabitEthernet 0/1/1
[~HUAWEI-GigabitEthernet0/1/1] portswitch
[*HUAWEI-GigabitEthernet0/1/1] shutdown
[*HUAWEI-GigabitEthernet0/1/1] commit
[~HUAWEI-GigabitEthernet0/1/1] quit
[~HUAWEI] erps ring 10
[*HUAWEI-erps-ring10] version v2
[*HUAWEI-erps-ring10] control-vlan 100
[*HUAWEI-erps-ring10] protected-instance all
[*HUAWEI-erps-ring10] port GigabitEthernet 0/1/1 rpl owner