3.4.5 Ring Protocol

<Structure of this section>

(1) Ring Protocol

The following table describes the capacity limits for Ring Protocol.

Table 3-21: Capacity limits for Ring Protocol
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

Note #1

If the Ring Protocol is used together with a Spanning Tree Protocol or with GSRP, or if the multi-fault monitoring functionality is used, the number will be 8.

Note #2

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

Note #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.

Note #4

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

Note #5

Each channel group is counted as one port.

(2) Virtual link

The following table describes the capacity limits for virtual links.

Table 3-22: 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 3-23: Capacity limits for monitoring multiple failures
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