Brocade Communications Systems Brocate Ethernet Access Switch 6910 - Manual (Page 395)

Brocade 6910 Ethernet Access Switch Configuration Guide 345
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Spanning Tree Commands
18
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
• This command filters all Bridge Protocol Data Units (BPDUs) received on an interface to save
CPU processing time. This function is designed to work in conjunction with edge ports which
should only connect end stations to the switch, and therefore do not need to process BPDUs.
However, note that if a trunking port connected to another switch or bridging device is
mistakenly configured as an edge port, and BPDU filtering is enabled on this port, this might
cause a loop in the spanning tree.
• Before enabling BPDU Filter, the interface must first be configured as an edge port with the
spanning-tree edge-port command.
Example
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree edge-port
Console(config-if)#spanning-tree bpdu-filter
Console(config-if)#
Related Commands
spanning-tree edge-port (347)
spanning-tree bpdu-guard
This command shuts down an edge port (i.e., an interface set for fast forwarding) if it receives a
BPDU. Use the no form without any keywords to disable this feature, or with a keyword to restore
the default settings.
Syntax
spanning-tree bpdu-guard [auto-recovery [interval interval]]
no spanning-tree bpdu-guard [auto-recovery [interval]]
auto-recovery - Automatically re-enables an interface after the specified interval.
interval - The time to wait before re-enabling an interface. (Range: 30-86400 seconds)
Default Setting
BPDU Guard: Disabled
Auto-Recovery: Disabled
Auto-Recovery Interval: 300 seconds
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
• An edge port should only be connected to end nodes which do not generate BPDUs. If a BPDU
is received on an edge port, this indicates an invalid network configuration, or that the switch
may be under attack by a hacker. If an interface is shut down by BPDU Guard, it must be
manually re-enabled using the
no spanning-tree spanning-disabled command if the
auto-recovery interval is not specified.