Spanning Tree Protocol
Configuring Multiple Spanning Tree
Cisco 220 Series Smart Switches Administration Guide Release 1.1.0.x
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•
Fast Link Operational Status
—Displays whether the Fast Link (Edge Port) is
enabled or disabled on the interface.
•
Port Status
—Displays the RSTP status of the interface. The values are:
-
Disabled
—RSTP is currently disabled on the interface.
-
Blocking
—The interface is currently blocked, and cannot forward traffic
or learn MAC addresses.
-
Learning
—The interface is in learning mode, and cannot forward traffic,
however it can learn new MAC addresses.
-
Forwarding
—The interface is in Forwarding mode, and can forward
traffic and learn new MAC addresses.
STEP 6
Click
Apply
. The RSTP interface settings are defined, and the Running
Configuration is updated.
STEP 7
If the selected interface connects to the bridge partner being tested, the Activate
Protocol Migration is activated. When a link partner is discovered by using STP,
click
Activate Protocol Migration
to run a Protocol Migration test. This test
discovers whether the link partner using STP still exists, and if so whether it has
migrated to RSTP or MSTP. If it still exists as an STP link, the device continues to
communicate with it by using STP. Otherwise, if it has been migrated to RSTP or
MSTP, the device communicates with it using RSTP or MSTP, respectively.
Configuring 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.
To configure MSTP:
STEP 1
Set the STP operation mode to MSTP as described in the
section.
STEP 2
Define global MSTP parameters as described in the
section.
