Spanning Tree
VLANs to a MSTP Instance
Cisco 350XG & 550XG Series 10G Stackable Managed Switches
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•
Max Hops
—Set the total number of hops that occur in a specific region
before the BPDU is discarded. Once the BPDU is discarded, the port
information is aged out. The field range is from 1 to 40.
•
IST Master
—Displays the regions master.
STEP 5
Click
Apply
. The MSTP properties are defined, and the Running Configuration file
is updated.
VLANs to a MSTP Instance
The VLAN to MSTP Instance page enables you to map each VLAN to a Multiple
Spanning Tree Instance (MSTI). For devices to be in the same region, they must
have the same mapping of VLANs to MSTIs.
NOTE
The same MSTI can be mapped to more than one VLAN, but each VLAN can only
have one MST Instance attached to it.
Configuration on this page (and all of the MSTP pages) applies if the system STP
mode is MSTP.
Up to 16 MST instances can be defined in addition to instance zero.
For those VLANs that are not explicitly mapped to one of the MST instances, the
device automatically maps them to the CIST (Core and Internal Spanning Tree)
instance. The CIST instance is MST instance 0.
To map VLANs to MST Instances:
STEP 1
Click
Spanning Tree
>
VLAN to MSTP Instance
.
The VLAN to MSTP Instance page contains the following fields:
•
MSTP Instance ID
—All MST instances are displayed.
•
VLANs
—All VLANs belonging to the MST instance are displayed.
STEP 2
To add a VLAN to an MSTP instance, select the MST instance, and click
Edit
.
STEP 3
Enter the parameters:
•
MSTP Instance ID
—Select the MST instance.
•
VLANs
—Define the VLANs being mapped to this MST instance.
