URGENT- Ports are flapping for VLAN

[gajanangavli]

i have stacking 3750 switches , using pvst .2 core as 6500.simple scenario.

port from a 105 VLAN are continuously flapping goes down and comes up immidiateldy.May i know if have any tips for troubleshooting.

[singhsaju]

Try to find out where is the root of the vlan 105 in your switch environment and if its not changing between switches . Also check for some unwanted switch or hub connected to your switch network recently.

[gajanangavli]

There is no change in root bridge as we are monitoring it also , not all ports are goes down at a time.