Configuring Mstp - Allied Telesis SwitchBlade x3100 Series Manual

Introduction

4.5.9 Configuring MSTP

4.5.9.1 Default Configuration
The default is the same as with (R)STP; only an RSTP instance exists, labeled MAIN with id 0, and it is disabled.
4.5.9.2 Configuration Guidelines
To meet the redundancy and load balance needs of the network, the minimum number of MSTIs necessary
•
should be created. This implies putting as many bridges as possible into an MST Region. With this minimum
number of MSTIs, multiple VLANs can be assigned to each one.
When multiple VLANs are mapped to the MSTI, port blocking will occur for all the VLANs on the ports
•
that are blocked by the MSTI.
An interface must be enabled against MAIN before it can be enabled to any other MSTP instance. (Before
•
enabling an MSTP instance against an interface, the MAIN instance must be enabled against that interface as
well.) Otherwise you will an error message, as shown here.
show stp interface=1.2 // 1.2 is excluded from MAIN instance
--- STP Interfaces Information ------------------------------------------------
STP Instance
---------------- --------------- --------------- --------------- ------------
MAIN
mst9
mst10
enable stp inst mst9 int 1.2 // attempting to include 1.2 in mst9
Error (040482): Could not enable MSTP instance for interface since MAIN
instance is excluded
enable stp int 1.2 // enabling all instances against interface 1.2
Info (040409): Spanning Tree Protocol operation is now enabled for the
specified interface/interface-list (1.2)// Repeated for each instance
show stp interface=1.2 // mst9 now has 1.2 included
--- STP Interfaces Information ------------------------------------------------
STP Instance
4-86
Software Reference for SwitchBlade x3100 Series Switches (Layer Two Switching)
Forwarding
Interfaces
- -
- -
- -
Forwarding
Learning Discarding
Interfaces Interfaces
-
-
-
Learning Discarding
Configuring MSTP
Excluded
Interfaces
1.2
-
1.2
Excluded