Configuring ERP ERP Configuration Overview and Guidelines
OmniSwitch AOS Release 7 Network Configuration Guide March 2011 page 9-11
ERP Configuration Overview and Guidelines
Configuring ERP requires several steps. These steps are outlined here and further described throughout
this section. For a brief tutorial on configuring ERP, see ““Quick Steps for Configuring ERP with Stan-
dard VLANs” on page 9-9.
By default, ERP is disabled on a switch. Configuring ERP consists of these main tasks:
1 Configure the basic components of an ERP ring (ring ports, service VLAN, and MEG level). See
“Configuring an ERP Ring” on page 9-12.
2 Tag VLANs for ring protection. See “Adding VLANs to Ring Ports” on page 9-12.
3 Configure an RPL port. When a ring port is configured as an RPL port, the node to which the port
belongs becomes the RPL owner. The RPL owner is responsible for blocking and unblocking the RPL.
See “Configuring an RPL Port” on page 9-13.
4 Change the Wait-To-Restore timer value. This timer value determines how long the RPL owner waits
before restoring the RPL to a forwarding state. See “Setting the Wait-to-Restore Timer” on page 9-13.
5 Change the Guard timer value. This timer value determines an amount of time during which ring nodes
ignore R-APS messages. See “Setting the Guard Timer” on page 9-14.
6 Configure the ring port to receive the loss of connectivity event for a Remote Ethernet OAM endpoint.
See “Configuring ERP with VLAN Stacking NNIs” on page 9-14.
7 Configure a VLAN Stacking NNI-to-SVLAN association for ERP control. This is done to include an
SVLAN in a ring configuration. See “Configuring ERP with VLAN Stacking NNIs” on page 9-14.
8 Clear ERP statistics. Commands to clear ERP statistics for a single ring or multiple rings are described
in “Clearing ERP Statistics” on page 9-16.
Configuration Guidelines
Use the following guidelines when configuring ERP for the switch:
• Physical switch ports and logical link aggregate ports can be configured as ERP ring ports. This also
includes VLAN Stacking Network Network Interface (NNI) ports.
• ERP is not supported on mobile ports, mirroring ports, link aggregate member ports, multicast VLAN
receiver ports (ERP is supported on Multicast VLAN sender ports only), VLAN Stacking User
Network Interface (UNI) ports, or RRSTP ring ports.
• An ERP ring port can belong to only one ERP ring at a time.
• When configuring a ring for a switch that is operating in the flat Spanning Tree mode using STP or
RSTP (not MSTP), administratively disable the default VLAN for the ring port. In this case, if the
switch is using RSTP, disabling Spanning Tree on the ring port is also required.
• When configuring a ring for a switch that is operating in the flat Spanning Tree mode using MSTP,
make sure the standard VLAN to which the ring port is assigned is not a member of an MSTI that is
also associated with ERP protected VLANs.
• The specified service VLAN ID must not participate in a Spanning Tree instance that is associated with
non-ERP VLANs. This canrequire changing the Spanning Tree configuration for the VLAN ID prior to
using this command.
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