1-39
Examples
# Enable the root guard function on Ethernet 1/0/1.
z
Enable the root guard function on Ethernet 1/0/1 in Ethernet port view.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] interface Ethernet 1/0/1
[Sysname-Ethernet1/0/1] stp root-protection
z
Enable the root guard function on Ethernet 1/0/1 in system view.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] stp interface Ethernet 1/0/1 root-protection
# Enable the root guard function on Ethernet 1/0/2 to Ethernet 1/0/4 in system view.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] stp interface Ethernet 1/0/2 to Ethernet 1/0/4 root-protection
stp tc-protection
Syntax
stp tc-protection enable
stp
tc-protection disable
View
System view
Parameters
None
Description
Use the
stp tc-protection enable
command to enable the TC-BPDU attack guard function.
Use the
stp tc-protection disable
command to disable the TC-BPDU attack guard function.
By default, the TC-BPDU guard attack function is enabled, and the MAC address table and ARP entries
can be removed for up to six times within 10 seconds.
Normally, a switch removes the MAC address table and ARP entries upon receiving TC-BPDUs. If a
malicious user sends a large amount of TC-BPDUs to a switch in a short period, the switch may be busy
in removing the MAC address table and ARP entries frequently, which may affect spanning tree
calculation, occupy large amount of bandwidth and increase switch CPU utilization.
With the TC-BPDU attack guard function enabled, a switch performs a removing operation upon
receiving a TC-BPDU and triggers a timer (set to 10 seconds by default) at the same time. Before the
timer expires, the switch only performs the removing operation for limited times (up to six times by
default) regardless of the number of the TC-BPDUs it receives. Such a mechanism prevents a switch
from being busy in removing the MAC address table and ARP entries.
Examples
# Enable the TC-BPDU attack guard function on the switch.
Содержание 5500-EI PWR
Страница 43: ...2 6...
Страница 76: ...1 17...
Страница 228: ...ii stp transmit limit 1 44 vlan mapping modulo 1 45 vlan vpn tunnel 1 46...
Страница 477: ...5 24 Sysname vlan 2 Sysname vlan2 service type multicast...
Страница 503: ...2 3 System View return to User View with Ctrl Z Sysname dot1x url http 192 168 19 23...
Страница 519: ...iii...
Страница 597: ...2 2 security policy server 192 168 0 1 user name format without domain...
Страница 648: ...1 9 Examples Clear static ARP entries Sysname reset arp static...
Страница 663: ...4 3 Sysname resilient arp interface vlan interface 2...
Страница 767: ...1 28 From 12 00 Jan 1 2008 to 12 00 Jun 1 2008...
Страница 1111: ...ii xmodem get 3 18...
Страница 1314: ...A 44 Z...