Specifications

ALAXALA Ring Configuration Guide (Edition 1)
Copyright © 2008, ALAXALA Networks Corporation. All rights reserved.
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3.1.2 Important points on constructing a system
This section explains the important points on constructing a system.
(1) The Spanning Tree Protocol (STP) must be disabled.
By default, the STP runs by means of PVST+ on AX series switches. However, you need to disable STP
because this configuration does not use STP.
(2) In addition to VLANs for data communication, a control VLAN is required.
With the Ring Protocol, a special VLAN is used for controlling the topology of the ring, while normal VLANs
are used for typical data communication. This special VLAN is required per ring (that is, per ring ID). Therefore,
when you assign VLANs, you need to take the ring control VLAN into account.
(3) VLANs for data communication need to be defined in the VLAN mappings.
You need to define data communication VLANs used for the Ring Protocol in the VLAN mappings.
When you configure path balancing across VLAN groups as described in (6) below, you can simplify the
configuration by these VLAN mappings (by configuring a group of multiple data transfer VLANs together),
which allows you to prevent a loop due to configuration errors or other trouble.
(4) The secondary port on the master node must be configured as a blocking port.
During normal operation, the blocking point in the ring is the secondary port on the master node. You cannot
specify the ring port on a transit node as the blocking point.
You can specify the secondary port (blocking port) by specifying a port that you want not to be blocked as a
primary port in your master node configuration (with the axrp-primary-port command).
Without this configuration (without executing the axrp-primary-port command to specify the primary
port), the primary port will be automatically determined as follows:
For VLAN group #1
Ring port #1 Ring port #2 Prioritized port
Physical port Physical port (For the box-type master node)
The port with the smaller
port number runs as the primary port.
Physical port Channel group
(Interface using the link
aggregation)
The physical port runs as the primary port.
Channel group Physical port The physical port runs as the primary port.
Channel group Channel group The port with the smaller channel group number runs as the
primary port.
For VLAN group #2
Ring port #1 Ring port #2 Prioritized port
Physical port Physical port (For the box-type master node)
The port with the larger
port number runs as the primary port.
Physical port Channel group The port for the channel group runs as the primary port.
Channel group Physical port The port for the channel group runs as the primary port.
Channel group Channel group The port with the larger channel group number runs as the
primary port.
Also, if you want to configure clockwise and counter-clockwise rings by using two VLAN groups, you need to
specify different ports for each VLAN group as primary ports.