Spanning Tree Commands
4-293
4
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
• If Port Loopback Detection is not enabled and a port receives it’s own BPDU,
then the port will drop the loopback BPDU according to IEEE Standard
802.1W-2001 9.3.4 (Note 1).
• Port Loopback Detection will not be active if Spanning Tree is disabled on the
switch.
Example
This command configures the release mode for a port that was placed in the
discarding state because a loopback BPDU was received. Use the
no
form to
restore the default.
Syntax
spanning-tree loopback-detection release-mode
{
auto
|
manual
}
no spanning-tree loopback-detection release-mode
•
auto
- Allows a port to automatically be released from the discarding state
when the loopback state ends.
•
manual
- The port can only be released from the discarding state manually.
Default Setting
auto
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
• If the port is configured for automatic loopback release, then the port will only
be returned to the forwarding state if one of the following conditions is
satisfied:
- The port receives any other BPDU except for it’s own, or;
- The port’s link status changes to link down and then link up again, or;
- The port ceases to receive it’s own BPDUs in a forward delay interval.
• If Port Loopback Detection is not enabled and a port receives it’s own BPDU, then
the port will drop the loopback BPDU according to IEEE Standard 802.1W-2001
9.3.4 (Note 1).
• Port Loopback Detection will not be active if Spanning Tree is disabled on the
switch.
• When configured for manual release mode, then a link down / up event will not
release the port from the discarding state.
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree loopback-detection
Содержание 6152PL2 FICHE
Страница 2: ......
Страница 6: ...vi ...
Страница 8: ...viii ...
Страница 32: ...Tables xxxii ...
Страница 38: ...Figures xxxviii ...
Страница 56: ...Initial Configuration 2 10 2 ...
Страница 378: ...Configuring the Switch 3 322 3 ...
Страница 651: ...Address Table Commands 4 273 4 Example Console show mac address table aging time Aging time 100 sec Console ...
Страница 817: ......
Страница 818: ...SMC6128PL2 SMC6152PL2 149100000007A R01 ...