4-7
system-guard tcn enable
Syntax
system-guard tcn enable
undo system-guard tcn enable
View
System view
Parameters
None
Description
Use the
system-guard tcn enable
command to enable System Guard against TCN attacks.
Use the
undo system-guard tcn enable
command to disable System Guard against TCN attacks.
With this feature enabled, System Guard monitors the TCN/TC packet receiving rate on the ports. If the
rate exceeds the preset threshold, the system will output trap and log information to notify the user and
starts to send only on TCN/TC packet to the CPU in a 10-second cycle. This can prevent MAC and ARP
entries from being frequently deleted by STP or RSTP; in addition, when the TCN/TC packet rate
exceeds the preset threshold, proper measures can be taken based on the output trap and log
information.
By default, this feature is disabled.
Examples
# Enable System Guard against TCN attacks.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] system-guard tcn enable
system-guard tcn rate-threshold
Syntax
system-guard tcn rate-threshold rate-threshold
undo system-guard tcn rate-threshold
View
System view
Parameters
rate-threshold
: TCN/TC packet receiving rate in packets per second (pps), with an effective range of 1
to 20.
Description
Use the
system-guard tcn rate-threshold
command to set the threshold of TCN/TC packet receiving
rate, which will trigger the output of trap and log information.
Summary of Contents for 5500-EI PWR
Page 43: ...2 6...
Page 76: ...1 17...
Page 228: ...ii stp transmit limit 1 44 vlan mapping modulo 1 45 vlan vpn tunnel 1 46...
Page 477: ...5 24 Sysname vlan 2 Sysname vlan2 service type multicast...
Page 503: ...2 3 System View return to User View with Ctrl Z Sysname dot1x url http 192 168 19 23...
Page 519: ...iii...
Page 597: ...2 2 security policy server 192 168 0 1 user name format without domain...
Page 648: ...1 9 Examples Clear static ARP entries Sysname reset arp static...
Page 663: ...4 3 Sysname resilient arp interface vlan interface 2...
Page 767: ...1 28 From 12 00 Jan 1 2008 to 12 00 Jun 1 2008...
Page 1111: ...ii xmodem get 3 18...
Page 1314: ...A 44 Z...