3.5.4 Ring Protocol

<Structure of this section>

(1) Ring Protocol

The following table describes the capacity limits for Ring Protocol.

Table 3-16 Ring Protocol housing conditions
Item	Per ring	Per switch
Number of rings	-	24^#1
Number of VLAN mappings	-	128
Number of VLAN groups	2	48^#2
Number of VLANs in a VLAN group	1023^{#3 #4}	1023^{#3 #4}
Number of ring ports*5	2	48^#2

Legend:-: Not applicable

#1

If Ring Protocol is used together with Spanning Tree Protocols or the multiple failure monitoring facility is used, the value is 8.

#2

If Ring Protocol is used together with Spanning Tree Protocols or the multiple failure monitoring facility is used, the value is 16.

#3

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.

#4

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

#5

Each channel group is counted as one port.

(2) Virtual link

The following table describes the capacity limits for virtual links.

Table 3-17: Capacity limits for virtual links
Item	Maximum number
Number of virtual link IDs per switch	1
Number of VLANs per virtual link	1
Number of ring nodes per base	2
Number of bases for virtual links in a network	250

(3) Multiple failure monitoring function

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

Table 3-18: 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