Cisco Sg3008 Manual

Spanning Tree
Configuring Rapid Spanning Tree Settings
236 Cisco Small Business 200, 300 and 500 Series Managed Switch Administration Guide (Internal Version) 
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-Blocking—The port is currently blocked, and cannot forward traffic (with 
the exception of BPDU data) or learn MAC addresses.
-Listening—The port is in Listening mode. The port cannot forward traffic, 
and cannot learn MAC addresses.
-Learning—The port is in Learning mode. The port cannot forward traffic, 
but it can learn new MAC addresses....

Spanning Tree
Configuring Rapid Spanning Tree Settings
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To enter RSTP settings:
STEP 1Click Spanning Tree > STP Status and Global Settings. Enable RSTP.
STEP  2Click Spanning Tree > RSTP Interface Settings. The RSTP Interface Settings 
page appears:
STEP  3Select a port.
NOTEActivate Protocol Migration is only available after selecting the port 
that is connected to the bridge partner being...

Spanning Tree
Configuring Rapid Spanning Tree Settings
238 Cisco Small Business 200, 300 and 500 Series Managed Switch Administration Guide (Internal Version) 
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-Designated—The interface through which the bridge is connected to the 
LAN, which provides the lowest cost path from the LAN to the Root 
Bridge.
-
Alternate—Provides an alternate path to the Root Bridge from the root 
interface. 
-
Backup—Provides a backup path to the designated port path toward the 
Spanning Tree leaves. This provides a...

Spanning Tree
Multiple Spanning Tree
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Multiple Spanning Tree
Multiple Spanning Tree Protocol (MSTP) is used to separate the STP port state 
between various domains (on different VLANs). For example, while port A is 
blocked in one STP instance due to a loop on VLAN A, the same port can be 
placed in the Forwarding State in another STP instance. The MSTP Properties 
page enables you to define the...

Spanning Tree
Mapping VL ANs to a MSTP Instance
240 Cisco Small Business 200, 300 and 500 Series Managed Switch Administration Guide (Internal Version) 
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Switches intended to be in the same MST region are never separated by switches 
from another MST region. If they are separated, the region becomes two separate 
regions.
This mapping can be done in the VLAN to MST Instance page.
Use this page if the system operates in MSTP mode.
To  d e f i n e  M S T P :
STEP 1Click Spanning Tree > STP Status and...

Spanning Tree
Defining MSTP Instance Settings
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 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 1Click Spanning Tree > VLAN to MSTP Instance.
The VLAN to MSTP Instance page contains the following fields:...

Spanning Tree
Defining MSTP Interface Settings
242 Cisco Small Business 200, 300 and 500 Series Managed Switch Administration Guide (Internal Version) 
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•Included VLAN—Displays the VLANs mapped to the selected instance. The 
default mapping is that all VLANs are mapped to the common and internal 
spanning tree (CIST) instance 0).
•Bridge Priority—Set the priority of this bridge for the selected MST 
instance.
•Designated Root Bridge ID—Displays the priority and MAC address of the 
Root Bridge for the...

Spanning Tree
Defining MSTP Interface Settings
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STEP  5Enter the parameters.
•Instance ID—Select the MST instance to be configured.
•Interface—Select the interface for which the MSTI settings are to be 
defined.
•Interface Priority—Set the port priority for the specified interface and MST 
instance.
•Path Cost—Enter the port contribution to the root path cost in the User 
Defined textbox or select...

Spanning Tree
Defining MSTP Interface Settings
244 Cisco Small Business 200, 300 and 500 Series Managed Switch Administration Guide (Internal Version) 
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-Backup—The interface provides a backup path to the designated port 
path toward the Spanning Tree leaves. Backup ports occur when two 
ports are connected in a loop by a point-to-point link. Backup ports also 
occur when a LAN has two or more established connections to a shared 
segment.
-Disabled—The interface does not participate in the Spanning...

Spanning Tree
Defining MSTP Interface Settings
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