Loop guard

[ram]

Hi all,

Can anyone tell me what is the command for implementing loopguard in alcatel 6850 switches .


Regards,
Ram

[one6f]

Please find in AOS 6.4.4.R01 OS6850/6850E Network Configuration Guide

Code: Select all

Enabling/Disabling Loop-guard
By default, loop-guard is disabled on ports associated with VLANs that have Spanning Tree disabled. This 
feature, when enabled prevents inconsistencies that cause network loops.

Use the bridge port loop-guard command to enable or disable loop-guard on a port or link aggregate. 
Enter bridge followed by an existing VLAN ID (or VLAN 1 if using a flat Spanning Tree instance) then 
loop-guard followed by enable or disable. 
For example, the following commands enable and disable loop-guard switching on port 1/2 :
-> bridge port 1/2 loop-guard enable 
-> bridge port 1/2 loop-guard disable
To enable or disable loop-guard on a link aggregate:
-> bridge port linkagg 1 loop-guard enable 
-> bridge port linkagg 1 loop-guard disable

Also please see here
Hope it helps.

[ram]

Hi One6f,

thanks a lot for sharing this Command . is this command will support on Aos 6.4.3 R01 .

Please Let me know or else tell me which command i have to implement for prevent loops in 6.4.3 R01.


Regards,
Ram

[one6f]

for example BPDU Guard also known as BPDU Shutdown.

[ram]

Hi One6F,

I have implemented qos bpdu guard shutdown policy.

After implementing this policy my network works fine.

we used mobile tag for carrying voice as well as data packets in userport. If anyone makes loops means it will remove the mobile tagging and make that port was in data vlan . after the user removes the loops then also it will be in data vlan . so my ipphones was not moved after network setup and it was restarting . for this problem i have configured again mobile tag on the particular port to carry voice and data vlan after that only my ip phones are working .

is there any solution for this...?


Regards,
Ram

[one6f]

Hi
here is from tech tip:

Mobile port warning messages are displayed in the console/swlog for 2 reasons.
The below given logs are printed in the swlog and in the console :
FRI MAY 22 17:10:07 2009 GM warning "gmcProcessMsg", FRI MAY 22 17:10:07 2009 GM warning gm : port 2/17 mobile ->fixed because rx bpdu

They are printed for below given 2 scenarios :
1) When the mobile port 2/17 is looped to another mobile port in the Switch.
2) When the mobile port 2/17 is connected as uplink port to another switch without the bpdu-ignore is enabled as "vlan port mobile 2/17"

So you can enable the bpdu-ignore enable as "vlan port mobile 2/17 bpdu-ignore enable" when connected as an uplink port to avoid this warning message on the console/swlog.

[ram]

Hi one6f,

I need remove particular user port in the Qos bpdu shutdown Policy . how i can do this ...?

Regards,
Ram

[one6f]

Hi,
To delete ports from a port group, use no and the relevant port number(s).

Code: Select all

-> policy port group techpubs no 2/1

Note. Port group configuration is not active until the qos apply command is entered.

[slixxboy]

hi one6f,
this loop guard can be used in uplinks of both switches?

[one6f]

It is pointless, loop guard can be triggered only on ports that receives BPDUs. In redundant topology there are root or alternate ports.