Brocade Communications Systems Brocate Ethernet Access Switch 6910 - Manual (Page 828)

778 Brocade 6910 Ethernet Access Switch Configuration Guide
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Configuring Interface Settings for MSTP
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• Learning – Port has transmitted configuration messages for an interval set by the Forward
Delay parameter without receiving contradictory information. Port address table is cleared,
and the port begins learning addresses.
• Forwarding – Port forwards packets, and continues learning addresses.
• Priority – Defines the priority used for this port in the Spanning Tree Protocol. If the path cost
for all ports on a switch are the same, the port with the highest priority (i.e., lowest value) will
be configured as an active link in the Spanning Tree. This makes a port with higher priority less
likely to be blocked if the Spanning Tree Protocol is detecting network loops. Where more than
one port is assigned the highest priority, the port with lowest numeric identifier will be enabled.
(Default: 128; Range: 0-240, in steps of 16)
• Admin MST Path Cost – This parameter is used by the MSTP to determine the best path
between devices. Therefore, lower values should be assigned to ports attached to faster
media, and higher values assigned to ports with slower media. (Path cost takes precedence
over port priority.) Note that when the Path Cost Method is set to short (page 3-63), the
maximum path cost is 65,535.
By default, the system automatically detects the speed and duplex mode used on each port,
and configures the path cost according to the values shown below. Path cost “0” is used to
indicate auto-configuration mode. When the short path cost method is selected and the
default path cost recommended by the IEEE 8021w standard exceeds 65,535, the default is
set to 65,535.
The recommended range is listed in Table 158 on page 769 .
The default path costs are listed in Table 159 on page 769 .
Interface
To configure MSTP parameters for a port or trunk:
1. Click Spanning Tree, MSTP.
2. Select Configure Interface from the Step list.
3. Select Configure from the Action list.
4. Enter the priority and path cost for an interface
5. Click Apply.
FIGURE 129 Configuring MSTP Interface Settings