C
HAPTER
14
| Basic Administration Protocols
Ethernet Ring Protection Switching
– 495 –
Version 2 is backward compatible with Version 1. If version 2 is
specified, the inputs and commands are forwarded transparently. If set
to version 1, MS and FS operator commands are filtered, and the switch
set to revertive mode.
The version number is automatically set to “1” when a ring node,
supporting only the functionalities of G.8032v1, exists on the same ring
with other nodes that support G.8032v2.
When ring nodes running G.8032v1 and G.8032v2 co-exist on a ring,
the ring ID of each node is configured as “1”.
In version 1, the MAC address 01-19-A7-00-00-01 is used for the node
identifier. The R-APS Def MAC parameter has no effect.
◆ MEG Level – The maintenance entity group (MEG) level which provides
a communication channel for ring automatic protection switching
(R-APS) information. (Range: 0-7)
This parameter is used to ensure that received R-APS PDUs are directed
for this ring. A unique level should be configured for each local ring if
there are many R-APS PDUs passing through this switch.
◆ Control VLAN – A dedicated VLAN used for sending and receiving
E-APS protocol messages. (Range: 1-4094)
Configure one control VLAN for each ERPS ring. First create the VLAN to
be used as the control VLAN (see "Configuring VLAN Groups" on
page 198), add the ring ports for the east and west interface as tagged
members to this VLAN (see "Adding Static Members to VLANs" on
page 200), and then use this parameter to add it to the ring.
The following restrictions are recommended to avoid creating a loop in
the network or other problems which may occur under some situations:
■
The Control VLAN must not be configured as a Layer 3 interface
(with an IP address), a dynamic VLAN (with GVRP enabled), nor as
a private VLAN.
■
In addition, only ring ports may be added to the Control VLAN. No
other ports can be members of this VLAN.
■
Also, the ring ports of the Control VLAN must be tagged.
Once the ring has been activated, the configuration of the control VLAN
cannot be modified. Use the Admin Status parameter to stop the ERPS
ring before making any configuration changes to the control VLAN.
◆ Node State – Refer to the parameters for the Show page.
◆ Node Type – Shows ERPS node type as one of the following:
■
None – Node is neither Ring Protection Link (RPL) owner nor
neighbor. (This is the default setting.)
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