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Table 3-12 Capacity limits for a Single-instance Spanning Tree
Model
All models
#1
This is the total number of ports configured in each VLAN incorporated in the
Spanning Tree Protocol (the product of the VLAN count and port count).
For example, if 100 VLANs are defined and two lines participate in each VLAN, the
total number of ports will be 100 x 2 = 200.
#2
The value of 256 includes the number of ports subject to PVST+.
#3
When used together with PVST+, the number of PVST+ target VLANs are
subtracted from the value.
Table 3-13 Capacity limits for a Multiple Spanning Tree
Model
All models
#1
This is the total number of ports configured in each VLAN incorporated in the
Spanning Tree Protocol (the product of the VLAN count and port count).
For example, if 100 VLANs are defined and two lines participate in each VLAN, the
total number of ports incorporated in the Spanning Tree Protocol will be 100 x 2 =
200.
#2
Excludes MST instance 0. The number of target VLANs in MST instance 0 is 256.
(6) Ring Protocol
(a) Ring Protocol
The following table describes the capacity limits for Ring Protocol.
Table 3-14 Capacity limits of the Ring Protocol
Item
Number of rings
Number of VLAN mappings
Number of VLAN groups
Number of VLANs in a VLAN group
#2
Number of ring ports
Number of applicable
VLANs
#3
256
Number of
VLAN ports
applicable
VLANs
256
1,024
Per ring
n/a
n/a
2
#1, #3
255
2
#1
VLAN ports
1,024
#1
Number of MST
instances
16
Per device
4
128
8
255
8
3 Capacity Limit
#1
VLAN ports
(when PVST+ also
#2
used
)
256
Number of VLANs in
each MST instance
200
#1, #3
#2
25
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