HP Procurve Switch readings

Can someone please explain the below log please. My phone system is working intermittently please ignore the time and date stamp. Im wondering if I have a loop somewhere

Apr 26 15:31:29:951 2000      WEB      Warning      WEBOPT_LOGIN_SUC      admin logged in from 192.168.113.2
Apr 26 15:31:29:937 2000      SC      Information      SC_AAA_SUCCESS      -AAAType=ACCOUNT-AAAScheme= local-Service=login-UserName=admin@system; AAA is successful.
Apr 26 15:31:29:937 2000      SC      Information      SC_AAA_LAUNCH      -AAAType=ACCOUNT-AAAScheme= local-Service=login-UserName=admin@system; AAA launched.
Apr 26 15:31:29:929 2000      SC      Information      SC_AAA_SUCCESS      -AAAType=AUTHOR-AAAScheme= local-Service=login-UserName=admin@system; AAA is successful.
Apr 26 15:31:29:928 2000      SC      Information      SC_AAA_LAUNCH      -AAAType=AUTHOR-AAAScheme= local-Service=login-UserName=admin@system; AAA launched.
Apr 26 15:31:29:928 2000      SC      Information      SC_AAA_SUCCESS      -AAAType=AUTHEN-AAAScheme= local-Service=login-UserName=admin@system; AAA is successful.
Apr 26 15:31:29:927 2000      SC      Information      SC_AAA_LAUNCH      -AAAType=AUTHEN-AAAScheme= local-Service=login-UserName=admin@system; AAA launched.
Apr 26 13:07:28:437 2000      IFNET      Error      LINK_UPDOWN      GigabitEthernet1/0/12 link status is DOWN.
Apr 26 13:05:31:715 2000      MSTP      Information      MSTP_FORWARDING      Instance 0's port GigabitEthernet1/0/12 has been set to forwarding state.
Apr 26 13:05:31:703 2000      IFNET      Error      LINK_UPDOWN      GigabitEthernet1/0/12 link status is UP.
Apr 26 13:05:27:274 2000      IFNET      Error      LINK_UPDOWN      GigabitEthernet1/0/12 link status is DOWN.
Apr 26 13:05:05:265 2000      IFNET      Error      LINK_UPDOWN      GigabitEthernet1/0/6 link status is DOWN.
Apr 26 13:04:49:398 2000      MSTP      Information      MSTP_FORWARDING      Instance 0's port GigabitEthernet1/0/12 has been set to forwarding state.
Apr 26 13:04:49:378 2000      IFNET      Error      LINK_UPDOWN      GigabitEthernet1/0/12 link status is UP.
Apr 26 13:04:05:528 2000      IFNET      Error      LINK_UPDOWN      GigabitEthernet1/0/12 link status is DOWN.
Apr 26 13:02:10:286 2000      MSTP      Information      MSTP_FORWARDING      Instance 0's port GigabitEthernet1/0/12 has been set to forwarding state.
Apr 26 13:02:10:267 2000      IFNET      Error      LINK_UPDOWN      GigabitEthernet1/0/12 link status is UP.
Apr 26 13:02:05:961 2000      IFNET      Error      LINK_UPDOWN      GigabitEthernet1/0/12 link status is DOWN.
Apr 26 13:01:28:089 2000      MSTP      Information      MSTP_FORWARDING      Instance 0's port GigabitEthernet1/0/12 has been set to forwarding state.
Apr 26 13:01:28:070 2000      IFNET      Error      LINK_UPDOWN      GigabitEthernet1/0/12 link status is UP.
Apr 26 13:01:18:298 2000      IFNET      Error      LINK_UPDOWN      GigabitEthernet1/0/12 link status is DOWN.
Apr 26 12:58:09:300 2000      MSTP      Information      MSTP_NOTIFIED_TC      Instance 0's port GigabitEthernet1/0/24 was notified of a topology change.
Apr 26 12:58:08:317 2000      MSTP      Information      MSTP_NOTIFIED_TC      Instance 0's port GigabitEthernet1/0/24 was notified of a topology change.
Apr 26 12:58:07:297 2000      MSTP      Information      MSTP_NOTIFIED_TC      Instance 0's port GigabitEthernet1/0/24 was notified of a topology change.
Apr 26 12:58:07:031 2000      MSTP      Information      MSTP_NOTIFIED_TC      Instance 0's port GigabitEthernet1/0/24 was notified of a topology change.
Apr 26 12:58:05:300 2000      MSTP      Information      MSTP_NOTIFIED_TC      Instance 0's port GigabitEthernet1/0/24 was notified of a topology change.
Apr 26 12:58:05:031 2000      MSTP      Information      MSTP_NOTIFIED_TC      Instance 0's port GigabitEthernet1/0/24 was notified of a topology change.
Apr 26 12:57:51:192 2000      MSTP      Information      MSTP_FORWARDING      Instance 0's port GigabitEthernet1/0/5 has been set to forwarding state.
Apr 26 12:57:51:174 2000      IFNET      Error      LINK_UPDOWN      GigabitEthernet1/0/5 link status is UP.
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Technical InformationAsked:
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BembiCEOCommented:
Looks like a loop...
Spanning Tree enabled...
And BPDU protection enabled?
At least you can see the port drops...
So, not wondering your phone makes trouble....

Instead of BPDU protection you may switch to BPDU filtering, this just filters the loop packages out instead of blocking the port...

But better to find out the loop source...

See this link for troubleshooting spanning tree issues...
http://h20564.www2.hpe.com/hpsc/doc/public/display?docId=emr_na-c03661144&sp4ts.oid=4177519

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Technical InformationAuthor Commented:
what would spanning tree provide if it was enabled and also what is bpdu

thanks
BembiCEOCommented:
In larger networks, the topology is often constructed in a way, that a data packet has several possible routes from the source to a target. Such topologies are built for redundancy, so if one way is down due to an outage of one switch, the data package has an alternative route to the target using another available switch. In general, the communication in a network should be a point to point communication. That means there is one single defines path from the source to the target and back.

Two devices are talking to each other and routing protocols should make sure, that a response package from the target device device takes the same route back than the initiating package from the source device. Otherwise firewalls would run into trouble.  

Beside one to one communication in a local networks you see also a lot of broadcasts and multicasts  (they are not routed to the internet), which are used to find devices or to inform other devices. This is a one to any or any to any communication and they flow over all existing paths. And this can result into a loop and or circulating packages which doesn't make any sense at all.

So the switches have to avoid, that such packages are circulation around as they would completely block the network at he end.

The spanning tree protocol (stp) is such a protocol which is used in such topologies and takes are of such empty traffic. And to make it working the switches have to talk to each other. This is called BPDU (Bridge Protocol Data Unit).
The effect is, that if one switch recognizes such a package, a BPDU multicast package is sent to inform other switches about this issue. One switch will change in a forwarding status while all other switches will just block the port. The result is, that (from the perspective of the circulating package) the topology will change into a tree structure. This make sure the package can reach all target but can not circulate any more.

This is what you see in your log, a topology change, ports switches to forwarding and ports which are switched off and switched on again. A result from he spanning tree algorithm.

Back to BPDU. The switch can just shut down the port or block the package. This is the difference between blocking and filtering. If the switch filters the circulation package, it is just eaten but the pprt stays up.

For you, the decision is the following:
If you have a topology with redundant paths or several routes from source to the target (see the h HP picture in the link I sent you), you should use spanning tree protocol on the switches to avoid empty traffic. In this case  -  as your phones seems to be affected - you may change from BPDU block to BPDU filter if your switches provides this.
On the other hand, as your phones are affected, which are connected to a port which seems to be blocked, you should investigate, what may b the reason. Possibly the phones are connected together with a computer using a SOHO switch (5 od 8 port desktop switches).

If you do not have such a topology, the spanning tee protocol in not needed, as the BPDU would produce itself empty and useless traffic. If it happens in this combination, the loop may be because some devices are connected to two different networks, i.e. cable as well as wireless, Nevertheless most of the devices can handle this situation for point to point traffic, but if a device in the network send a broadcast, the client may receive it over the WLAN and sends back the response over the wired network or vice versa, depending from he default gateway of the devices.

From the telephone perspective there is also a possibility for loops, if the telephone is connected to the LAN and has a second connection to the computer (possibly USB) because the users uses some telephony applications.

A good idea is always not to let run everything what is setup by default but just to switch off what is not needed. Especially printers may sometimes talk a lot because they are setup to use any kind of protocols and even some of them are sending permanently broadcasts over the network although there are no receivers in the network.
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Don JohnstonInstructorCommented:
I don't know that you've got a loop.

The first thing that happens is G1/0/5 comes up.  About 4 minutes later, G1/0/12 goes down.  After that, it bounces repeatedly.

What's leads me to think that it's not a spanning tree issue is the intervals between interface flaps.
:37
1:55
:15
1:57

There intervals are not consistent with a loop.

What is connected to g1/0/12?
Deepak MuralidharanCommented:
Is it resolved ?
Technical InformationAuthor Commented:
Yes thanks
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