3.4.4 Ring Protocol

<Structure of this section>

(1) Ring Protocol

The following table describes the capacity limits for Ring Protocol.

Table 3-15 Ring Protocol housing conditions
Item	Per ring	Per switch
Number of rings	-	24
Number of VLAN mappings	-	128
Number of VLAN groups	2	48
Number of VLANs in a VLAN group	1023^{#1 #2}	1023^{#1 #2}
Number of ring ports*3	2	48

Legend:-: Not applicable

#1

The maximum recommended number of VLANs for a switch.

The control VLAN needed for each ring accounts for one VLAN, leaving a maximum of 1023 VLANS available for VLAN groups. As the number of rings increases, the number available for VLAN groups decreases.

#2

The multi-fault monitoring functionality accounts for one VLAN per ring, which reduces the maximum number of VLANs available for VLAN groups.

#3

Each channel group is counted as one port.

(2) Multiple failure monitoring function

The following table describes the capacity limits for the multi-fault monitoring functionality.

Table 3-16: Capacity limits for the multiple failure monitoring facility
Item	Maximum number
Number of multi-fault monitoring-enabled rings per switch	4
Multi-fault monitoring VLANs per ring	1
Number of multi-fault monitoring VLANs per switch	4