Ports go Up and Down

[Ayman_bowaihel]

Hi:

I'm facin issue with 3500yl-48G . .. when I checked the log file I found that the ports (access ports)  is goinig up and down frequently and within short time.. When I checked other HP switches it look working fine and port goes up only one time and contuinoue on that situation.. exept other switch has the same issue witch is 2910al .....the switch is connected to Distribution switch the Uplink is working normal .. here some part of the log file ..time and dates is not set on the switch :P

I 08/07/08 16:00:50 00076 ports: port 16 is now on-line
I 08/07/08 16:00:56 00560 ports: port 12 PD Detected.
I 08/07/08 16:00:56 00561 ports: port 12 Applying Power to PD.
I 08/07/08 16:00:56 00560 ports: port 27 PD Detected.
I 08/07/08 16:00:56 00561 ports: port 27 Applying Power to PD.
I 08/07/08 16:00:56 00560 ports: port 15 PD Detected.
W 08/07/08 16:00:56 00566 ports: port 15 PD Denied power due to insufficient
power allocation.
W 08/07/08 16:00:56 00564 ports: port 16 PD Invalid Signature indication.
I 08/07/08 16:00:57 00560 ports: port 15 PD Detected.
I 08/07/08 16:00:57 00561 ports: port 15 Applying Power to PD.
I 08/07/08 16:00:57 00076 ports: port 12 is now on-line
I 08/07/08 16:00:59 00076 ports: port 15 is now on-line
I 08/07/08 16:00:59 00076 ports: port 27 is now on-line
-- MORE --, next page: Space, next line: Enter, quit: Control-CI 08/07/08 16:01:04 00077 ports: port 27 is now off-line
I 08/07/08 16:01:09 00076 ports: port 27 is now on-line
I 08/07/08 16:12:18 00077 ports: port 12 is now off-line
I 08/07/08 16:12:20 00077 ports: port 15 is now off-line
I 08/07/08 16:12:23 00076 ports: port 12 is now on-line
I 08/07/08 16:12:26 00076 ports: port 15 is now on-line
I 08/07/08 16:23:43 00077 ports: port 12 is now off-line
I 08/07/08 16:23:45 00077 ports: port 15 is now off-line
I 08/07/08 16:23:46 00076 ports: port 12 is now on-line
I 08/07/08 16:23:49 00076 ports: port 15 is now on-line
I 08/07/08 16:35:15 00077 ports: port 12 is now off-line
I 08/07/08 16:35:19 00076 ports: port 12 is now on-line
I 08/07/08 16:35:24 00077 ports: port 15 is now off-line
I 08/07/08 16:35:28 00076 ports: port 15 is now on-line
I 08/07/08 16:46:39 00077 ports: port 12 is now off-line
I 08/07/08 16:46:42 00076 ports: port 12 is now on-line
I 08/07/08 16:46:51 00077 ports: port 15 is now off-line
I 08/07/08 16:46:54 00076 ports: port 15 is now on-line
I 08/07/08 16:58:03 00077 ports: port 12 is now off-line
I 08/07/08 16:58:06 00076 ports: port 12 is now on-line
I 08/07/08 16:58:16 00077 ports: port 15 is now off-line
I 08/07/08 16:58:19 00076 ports: port 15 is now on-line
I 08/07/08 17:09:27 00077 ports: port 12 is now off-line

[Vince_Whirlwind]

What kind of devices do you have on those ports?

What does  "show interface" show, as far as errors go?

What does "show power" give you?

[Ayman_bowaihel]

this is an edge switch. this switch is connected to distribution ...
only user are connected with their PC .. and sometime they connect wireless router ...
I have configured the DHCP Snooping policy so they don't disturbe the internet service on other users ..

** show interfaces look normal

and this is not a power switch

now the show logging show that one of the port is blocked by STP .. I disable that port... it show other two ports also blocked by STP .. strange I checked the port from user side and there is no loop it is connected straight to PC

[Ayman_bowaihel]

I also disable the STP... the problem still there it is like any ort come up it blocked it for certain time then it became online then offline the blocked again and so on
---- Reverse event Log listing: Events Since Boot ----
I 11/01/13 12:18:22 00076 ports: port 10 is now on-line
I 11/01/13 12:18:19 00435 ports: port 10 is Blocked by STP
I 11/01/13 12:17:20 00076 ports: port 18 is now on-line
I 11/01/13 12:17:18 00435 ports: port 18 is Blocked by STP
I 11/01/13 12:17:16 00077 ports: port 18 is now off-line
I 11/01/13 12:17:14 00435 ports: port 18 is Blocked by STP
I 11/01/13 12:17:10 00077 ports: port 18 is now off-line
I 11/01/13 12:17:06 00076 ports: port 18 is now on-line
I 11/01/13 12:17:04 00435 ports: port 18 is Blocked by STP
I 11/01/13 12:16:14 00179 mgr: SME TELNET from 10.1.1.199 - MANAGER Mode
W 11/01/13 12:15:19 00859 dhcp-snoop: backplane: Ceasing client address mismatch
logs for 5m
W 11/01/13 12:15:19 00858 dhcp-snoop: backplane: client address 001e68-f339cb
not equal to source MAC 00215d-15b91f detected on port 6
W 11/01/13 12:14:18 00858 dhcp-snoop: backplane: client address 001e68-f339cb
not equal to source MAC 00215d-15b91f detected on port 6
W 11/01/13 12:07:55 00859 dhcp-snoop: backplane: Ceasing client address mismatch
logs for 5m
W 11/01/13 12:07:55 00858 dhcp-snoop: backplane: client address 001e68-f339cb
not equal to source MAC 00215d-15b91f detected on port 6
W 11/01/13 12:06:54 00858 dhcp-snoop: backplane: client address 001e68-f339cb
not equal to source MAC 00215d-15b91f detected on port 6
W 11/01/13 12:00:49 00859 dhcp-snoop: backplane: Ceasing client address mismatch
logs for 5m
W 11/01/13 12:00:49 00858 dhcp-snoop: backplane: client address 001e68-f339cb
not equal to source MAC 00215d-15b91f detected on port 6
W 11/01/13 11:59:48 00858 dhcp-snoop: backplane: client address 001e68-f339cb
not equal to source MAC 00215d-15b91f detected on port 6
W 11/01/13 11:53:33 00859 dhcp-snoop: backplane: Ceasing client address mismatch
logs for 5m
W 11/01/13 11:53:33 00858 dhcp-snoop: backplane: client address 001e68-f339cb
not equal to source MAC 00215d-15b91f detected on port 6
W 11/01/13 11:52:33 00858 dhcp-snoop: backplane: client address 001e68-f339cb
not equal to source MAC 00215d-15b91f detected on port 6
I 11/01/13 11:48:09 00077 ports: port 10 is now off-line
W 11/01/13 11:46:07 00859 dhcp-snoop: backplane: Ceasing client address mismatch
logs for 5m
W 11/01/13 11:46:07 00858 dhcp-snoop: backplane: client address 001e68-f339cb
not equal to source MAC 00215d-15b91f detected on port 6
W 11/01/13 11:45:08 00858 dhcp-snoop: backplane: client address 001e68-f339cb
not equal to source MAC 00215d-15b91f detected on port 6
-- MORE --, next page: Space, next line: Enter, quit: Control-C

[Vince_Whirlwind]

The "blocked by STP" is normal operation: when a port comes up, spanning-tree goes through its normal states before it transitions to forwarding.

If you want to get rid of the spanning-tree messages, have those edge ports transition immediately to "forwarding" by applying,

"spanning-tree (interface number) admin-edge-port".

[Richard Brodie_1]

It could be  that a faulty driver at the PC end is driving the link up and down; I would definitely check out a PC or two, get the latest vendor drivers, see if it fixes the problem.