Specifications

ALAXALA Ring Configuration Guide (Edition 1)
Copyright © 2008, ALAXALA Networks Corporation. All rights reserved.
19
2.6 When a line is down in only one direction
In some cases, if the auto-negotiation is disabled in the port configuration, or if a relay device such as a media
converter is connected to the master node or between transit nodes in the ring, the line cannot be put into
link-down state in response to the line being down in only one direction.
For the Ring Protocol, when the line is down in only one direction, a node can no longer receive either of the
clockwise or counter-clockwise health-check frames sent by the master node. However, as long as the node can
receive frames in either direction, a failure is not assumed to occur. This is because if the port in the Blocking
state is switched to the Forwarding state due to the line down in one direction, a data loop occurs in the direction
in which communication was possible before switching to Forwarding.
Therefore, to detect a line down in one direction in the Ring Protocol, we recommend that you configure the
ring line by:
- Directly connecting optical fiber lines
- Using the auto-negotiation functionality, or
- Using the UDLD (Uni-Directional Link Detection) functionality
If you use one of the solutions above, the link will be down when the line down in one direction occurs.
Therefore, the master node in the Ring Protocol cannot receive the health-check frames, resulting in a failure
operation.
2.7 Supported specifications
Table 2.7-1 shows the supported specifications of the Ring Protocol. When you use the Ring Protocol with
STP or GSRP, the supported specifications for the virtual link must also be satisfied as shown in Table 2.7-2. In
the tables, the chassis-type refers to the AX6700S/AX6300S series switches, and the box-type refers to AX3600S
and AX2400S series switches.
2.7.1 Common specifications supported
Table
2.7-1 List of the supported specifications for the Ring Protocol
No. Item Supported specifications
Chassis-type Box-type
Remarks
1 Single ring Supported
2
Configuration
Multi-ring
Supported
(including multi-ring configurations
with shared links)
3 Number of rings per device
A maximum of
16
A maximum of 8
4
Number of
rings
Number of nodes per ring
Minimum: 2
Maximum: Unlimited
Depending on the number of nodes
in a ring, the health-check frame
sending interval and monitoring
time must be adjusted.
5
Ring
port
Number of ports per ring 2
Both physical lines and LA can be
specified for a ring port.
6
Number of control VLANs
per ring
[Range of available VLAN
number]
1 [2 - 4095] 1 [2 - 4094]
You cannot use the default VLAN.
7
Number of VLAN groups
for data transfer per ring
A maximum of 2
A single VLAN group per ring can
also be configured.
8
Number of VLAN groups
for data transfer per device
A maximum of
32
A maximum of 16
(Number of rings per device) x
(Number of VLAN groups for data
transfer per ring)
9
VLAN
configuration
Maximum number of
VLANs per VLAN group
for data transfer
4094
1023
(recommended)
(You can set the
value to 4093, but
we recommend that
you specify the
value to 1023 as a
maximum value for
the device.)
The number of available VLANs is
the maximum number of VLANs -
1 (for the control VLAN).