Configuring Guard Functions - 3Com 4210 PWR Configuration Manual

Configuration Example
Configuring Guard
Functions
Introduction
Perform the mCheck operation in system view
Table 128 Perform the mCheck operation in system view
Operation
Enter system view
Perform the mCheck
operation
Perform the mCheck operation in Ethernet port view
Table 129 Perform the mCheck operation in Ethernet port view
Operation
Enter system view
Enter Ethernet port view
Perform the mCheck
operation
# Perform the mCheck operation on Ethernet 1/0/1.
1 Perform this configuration in system view
<4210> system-view
[4210] stp interface Ethernet1/0/1 mcheck
2 Perform this configuration in Ethernet port view
<4210> system-view
[4210] interface Ethernet1/0/1
[4210-Ethernet1/0/1] stp mcheck
The following guard functions are available on an MSTP-enabled switch: BPDU
guard, root guard, loop guard, TC-BPDU attack guard, and BPDU drop.
BPDU guard
Normally, the access ports of the devices operating on the access layer are directly
connected to terminals (such as PCs) or file servers. These ports are usually
configured as edge ports to achieve rapid transition. But they resume non-edge
ports automatically upon receiving configuration BPDUs, which causes spanning
tree recalculation and network topology jitter.
Normally, no configuration BPDU will reach edge ports. But malicious users can
attack a network by sending configuration BPDUs deliberately to edge ports to
cause network jitter. You can prevent this type of attacks by utilizing the BPDU
guard function. With this function enabled on a switch, the switch shuts down the
edge ports that receive configuration BPDUs and then reports these cases to the
administrator. Ports shut down in this way can only be restored by the
administrator.

Configuring Guard Functions

Command
system-view
stp [ interface interface-list ]
mcheck
Command
system-view
interface interface-type
interface-number
stp mcheck
173
Description
-
Required
Description
-
-
Required