Alcatel-Lucent 6850-48 网络指南

Configuring an ERP Ring

Configuring ERP

page 14-16

OmniSwitch AOS Release 6 Network Configuration Guide

A VLAN Stacking Network Network Interface (NNI) can participate in an ERP ring. However, an NNI is 
created through an association of a port with an SVLAN. Both STP and ERP cannot control the same 
VLAN-port association (VPA). By default, the NNI to SVLAN association is controlled by STP. 

To include an NNI in an ERP ring, specify ERP control at the time the NNI association is configured. This 
is done using the erp parameter of the 

 command. For example:

-> ethernet-service svlan 1001 nni 1/1 erp

-> ethernet-service svlan 1001 nni 1/2 erp

The above commands configure ports 1/1 and 1/2 as NNI ports for SVLAN 1001 with ERP control over 
the VPA. Note that the SVLAN specified must already exist in the switch configuration. 

To configure an ERP ring with NNI-SVLAN associations, use the 

command but specify an 

SVLAN ID for the service VLAN and the associated NNI ports as the ring ports. For example:

-> erp-ring 1 port1 1/1 port2 1/2 service-vlan 1001 level 2

-> erp-ring 1 enable

Note the following when configuring an ERP ring with VLAN Stacking NNI-SVLAN associations:

• Only two ERP type NNI associations are allowed per SVLAN. 

• Configuring an ERP ring on 8021q tagged port associations with SVLANs is not allowed.

• Configuring an ERP Ring on an STP type NNI association with an SVLAN is not allowed.

• Configuring an IMPVLAN as an ERP service VLAN is not allowed.

• If an SVLAN that is not associated with any NNI ports is configured as the service VLAN for an ERP 

ring, the NNI ring ports are automatically associated with that SVLAN at the time the ring is created.

• SVLAN User Network Interface (UNI) associations are not eligible for ERP ring protection.

• If the ERP type NNI ports are connected to the STP path via UNI ports, then STP BPDUs can be 

tunneled with the help of VLAN-stacking mechanism.

• Deleting an ERP service VLAN and it’s associated NNI ports is only allowed when the ERP ring itself 

is deleted using the no for of the erp-ring command. None of the VLAN Stacking CLI commands can 
remove a service VLAN consisting of an NNI-SVLAN association.

The following sequence of configuration commands provides an example of configuring an ERP ring 
consisting of VLAN Stacking NNI ports and SVLANs:

-> ethernet-service svlan 100

-> ethernet-service svlan 200

-> ethernet-service svlan 100 nni 1/3

-> ethernet-service svlan 100 nni 1/1 erp

-> ethernet-service svlan 100 nni 1/2 erp

-> erp-ring 10 port1 1/1 port2 1/2 service-vlan 200 level 3 enable

In the above example, ERP ring 10 is configured as follows:

1 SVLANs 100 and 200 are created.

2 Port 1/3 is associated with SVLAN 100, but no erp parameter is used. As a result, port 1/3 is an STP 
type NNI association by default.