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Frequent Contributor II

Does a controller do something every 24 hours? Network problem diagnosis, please!

I have a very odd situation on my switch stack. Every morning, between 9 and 9:30, there appears to be a broadcast storm and spanning tree confusion.

 

These HP switches turn all the traffic lights solid green, and overall LAN performance is degraded for some, but not all.

 

Rebooting the switches, and one in particular, clears the problem for the day. Then, the next day, again between 9 and 9:30, the same thing happens.

 

I have been tracing things out, doing SNMP and log analysis, spectrum to look for correlations. But today I kept the suspect switch's uplink ports down from 9 to 10 and then brought the switch up, and so far so good.

 

Attached to this switch is the normal office PC's and Printers. But also an Aruba 7210. I must confess to knowing very little about this box. We used to have a flat VLAN structure but have been expaning that for a few months, and the new VLANS seem to coincide with my problems.

 

So does the 7210 do something on a 24 hour cycle? I'm really scratching my head over how a problem can happen, then a switch reboot clears it for the day. I have been suspecting a bad NIC somewhere, or cabling, but how would this be just once per day?

 

As I said, I'm pretty ignorant on the controller. An Aruba engineer helped me set it up, and it has been operating fine for close to a year. But new VLANS means spanning tree has gotten complex, and this seems to be where I am running into problems.

Valued Contributor II

Re: Does a controller do something every 24 hours? Network problem diagnosis, please!

Hi,

 

Are these controllers managed by Airwave ? and what is the STP status on the uplink ports ?

Cheers,
Venu Puduchery,
[Is my post helped you ? Give Kudos :) ]
Frequent Contributor II

Re: Does a controller do something every 24 hours? Network problem diagnosis, please!

Yes, the controller is managed by Airwave. Or perhaps I should say Airwave reports on this controller.

 

I have VLANS and cables connected to ports 0, 1 and 3

Port 0 - spanning tree not enabled Native VLAN 1, allow vlans 1,160

Port 1 - This is the supect port and I'm frankly unclear why it was setup this way. I have it admin-down on the HP switch it connects to. It is set at VLAN 165 and STP enabled, cost 19

Port 3 - Spanning tree enabled cost 19, port fast, p2p, VLAN 114

 

VLAN 1 and 114 exist in my switch stack. 1 is currently for the management interface (but will change this to 110 soon), 114 is for the Access Points and gets DHCP from the controller. VLAN 160 is for the guest SSID and the controller hands out DHCP leases here as well. I don't know what 165 is all about - appears to be an interface for a publicly routable IP. I have that interface down now with no ill effects on the AP's or connections.

 

Valued Contributor II

Re: Does a controller do something every 24 hours? Network problem diagnosis, please!

HI,

 

Here suspected element is Airwave, it will generate SNMP traffic during maintenance time, default time is midnight and early morning (4.30 am).

 

Do RCA from Airwave side, check whether Airwave is configured for maintenance or not.

 

 

Cheers,
Venu Puduchery,
[Is my post helped you ? Give Kudos :) ]
Frequent Contributor II

Re: Does a controller do something every 24 hours? Network problem diagnosis, please!

Thanks. Sorry to be ignorant - what's RCA?

Frequent Contributor II

Re: Does a controller do something every 24 hours? Network problem diagnosis, please!

Looking at the webui, I see daily maintenance happening at 4:17 each morning and reports being generated at midnight. I don't see anything special about 9-9:30.

Frequent Contributor II

Re: Does a controller do something every 24 hours? Network problem diagnosis, please!

I do see in Airwave AMP Setup/General that the device configuration audit interval is "Daily".

 

How do I tell the time of day that this has kicked off? Hopefully I have a few weeks history to see if it's related.

Guru Elite

Re: Does a controller do something every 24 hours? Network problem diagnosis, please!

Sounds like a physical loop is being created.



Colin Joseph
Aruba Customer Engineering

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