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16.1.2 Port Roles
The MS TP bridge assigns a port role to each port which runs MSTP.
CIS T port roles: Root Port, Designated Port, Alternate Port and B ackup Port
On top of those roles, each MS TI port has one new role: Master Port.
The port roles in the CIS T (Root Port, Designated Port, Alternate Port and B ackup Port ) are defined in the
same ways as those in the RS TP.
16.1.3 MSTP Load Balance
In a MS TP region, VLA Ns can by mapped to various instances. That can form various topologies. Each
instance is independent from the others and each distance can have its own attribut es such as bridge priority
and port cost etc. Consequently, the VLANs in different instances have their own paths. The traffic of the
VLANs are load-balanced.
16.2 MSTP Configuration Task List
MSTP configuration task list:
1.
Enable the MS TP and set the running mode
2.
Configure instance parameters
3.
Configure MS TP region parameters
4.
Configure MS TP time parameters
5.
Configure the fast migrate feature for MS TP
6.
Configure the format of port packet
7.
Configure the snooping attribute of authentication key
8.
Configure the FLUS H mode once topology changes
1. Enable MSTP and set the running mode
Global Mode and Port Mode
spanning-tree
no spanning-tree
Global Mode
spanning-tree mode {mstp|stp|rstp}
no spanning-tree mode
Port Mode
spanning-tree mcheck
2. Configure instance parameters
Global Mode
spanning-tree mst <instance-id> priority
<bridge-priori ty>
Command
Command
Explanation
Enable/Disable MS TP.
Set MSTP running mode.
Force port migrate to run under MSTP.
Explanation
Set bridge priority for specified instance.
16-3
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