User's Manual

Table Of Contents
280
Users Manual of CS-6306R
transmit the MEAPS packets. Each MEAPS has two control VLANs, that is, the main control VLAN and the
sub control VLAN.
You need to specify the main control VLAN when configuring the major ring or the sub ring. During
configuration you just need to specify the main control VLAN and take a VLAN, the ID of which is 1 more than
the ID of the main control VLAN, as the sub control VLAN. The major ring will be added to the main control
VLAN and the sub control VLAN at the same time, while the sub ring will only be added to the sub control
VLAN. See number 3 and number 4 beside each port on figure 2.
The main-ring protocol packets are transmitted in the main control VLAN, while the sub-ring protocol packets
are transmitted in the sub control VLAN. The sub control VLAN on the major ring is the data VLAN of the
major ring. The ports of a switch that access the Ethernet ring belong to the control VLAN, and only those
ports that access the Ethernet ring can be added into the control VLAN.
Remarks:
The MEAPS port of the major ring should belong to both the main control VLAN and the sub control VLAN;
the MEAPS port of the sub ring only belongs to the sub control VLAN. The major ring is regarded as a logical
node of the sub ring and the packets of the sub ring are transparently transmitted through the major ring; the
packets of the major ring are transmitted only in the major ring.
27.1.2.6 Data VLAN
The data VLAN is used to transmit data packets. The data VLAN can include the MEAPS port and the
non-MEAPS port. Each domain protects one or multiple data VLANs. The topology that is calculated by the
ring protection protocol in a domain is effective only to the data VLAN in this domain.
Whether the data VLAN is created or not has no influence on the work of the ring state machine, where the
MEAPS port is controlled by the MEAPS module and the non-MEAPS port is controlled by the STP module.
Remarks:
The processing methods which are similar to that of the MSTP module can be used, that is, the status of a
port in the default STP instance is decided by the link status of the port, no matter what the VLAN
configuration of a port is.
27.1.2.7 Master Node
The master node works as policy making and control of a ring. Each ring must possess only one master node.
The master node takes active attitude to know whether the ring’s topology is complete, removes loopback,
control other switches to update topology information. See the following figure, where S3 is the master node
of the sub ring and S4 is the master node of the major ring.