03-04-2019 05:53 PM
hi. i use 2960S for test
but few days ago, VLAN interfaces got down and up intermittently.
so i looking for log about VLAN problem but there was nothing about information about this problem. just written like some vlan interfaces down and up.
is there bug about specific version of ios or just my device's problem?
if you guys know about this problem, help me.
Solved! Go to Solution.
03-05-2019 12:34 AM
You have not mentioned how these switch connected in the network, is this standlone Switch or connect to Core/Distribution swithch ?
If it is standalone switch, how many devices connected. there may be reason VLAN Go Up and Down, there is no members in that VLAN port like no device connected, the interface VLAN go down, when the active device connected then vlan come up.
nice to have show version and show interface status, show running config ( as suggested other post to understand envirionment)
03-04-2019 07:00 PM
03-07-2019 08:58 PM
thx for your help.
i'll tell these commands to original owner.
have a good day!
03-04-2019 11:16 PM
Hi,
What is your switch IOS version?
There may some reasons behind the scene as STP issue with the network, Physical Link Flapping et.
If the switch is not restarted yet then share some output as "Show Logging", "Show Version", "Show spanning-tree active..."
Regards,
Deepak Kumar
03-07-2019 08:57 PM
this switch is now out of my hands so can't check about IOS version.
but there's only VLANxxx has up and down record. no reason.
anyway thx about your reply! have a good day!
03-05-2019 12:34 AM
You have not mentioned how these switch connected in the network, is this standlone Switch or connect to Core/Distribution swithch ?
If it is standalone switch, how many devices connected. there may be reason VLAN Go Up and Down, there is no members in that VLAN port like no device connected, the interface VLAN go down, when the active device connected then vlan come up.
nice to have show version and show interface status, show running config ( as suggested other post to understand envirionment)
03-07-2019 08:55 PM
it was used for infrastructure network but has problem. so i got it out for test.
i think VLANs are flapping. so i connected with other switch and it seems has problem.
there's no log about VLAN up and down reason. just recorded like VLANxxx has down or up.
thx for your reply!
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