CP-6941 detailed rebooting process vs internal switch behavior

[Andriy Zatyshnyy]

Hi all,

We got problem with phone rebooting and its network cutting during phone rebooting time.

We got that scheme:

Access sw with PoE---CP-6941---VDI monoblock under Citrix.

When user logs into an AD with his credentials the phone goes to rebooting cycle cutting for that period monoblock out of a network using its internal switch.

When phone boots up monoblock can get the network.

Does anb know the step by step booting process of a phone and its internal switch behavior during that period?

KR

Andriy

[Martin Moran]

Hi @AZatishny,

A few questions for you:

• Is this behaviour new in your environment?
• Is the IP Phone new in your environment? For how long has it been in your network?
• How much power does it consume?
• Did you try to change the IP Phone to another port?
• Did you change the cabling?
• Is it a Cisco Switch? How much power can it give to the endpoints? How much power there is left?

Waiting for your responses.

Rgrds,

Martin, IT Specialist

[Andriy Zatyshnyy]

Hi Martin,

My answers:

• Is this behaviour new in your environment?

No, first problem was detected on January 2014.

• Is the IP Phone new in your environment? For how long has it been in your network?

There is a pool of 534 phones CP-6941. Since January 2014, as i mentioned.

• How much power does it consume?

IEEE 802.3af PoE. So i guess 15.4 Wt max?

• Did you try to change the IP Phone to another port?

Yes, client did it lots of time

• Did you change the cabling?

No, but there are 534 phones, and every day 2-4 of them are cutting Lenovo monoblock out of VMware network resources.

• Is it a Cisco Switch? How much power can it give to the endpoints? How much power there is left?

Yes, L3. Cisco WS-C4510R+E and Cisco WS-C3560X-48P-E. I still wait for exat configs of these switches. But saw that WS-C3560X-48P-E got 715 Wt total. So if all the ports are busy, it's 14.89 Wt each. Cisco WS-C4510R+E i will clarify which power supply is inside.

By the way we should consider that when phone reboots it spends more power to restart.

KR

Andriy

[Martin Moran]

Hi @AZatishny,

• C6941 IP Phones are PoE Class B phones and they consume around 7 Watts.
• The fact that your switch has a 715 W PS (PS = Power Supply) doesn't mean that those 715 W are exclusive for PoE. A 715 W PS just give a maximum of 435 W. See the following link for more info and search for the C3560X-48P-E: 

http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-3750-x-series-switches/data_sheet_c78-584733.html?cachemode=refresh

Also, maybe some ports of the switches are providing more power to the endpoints than what they really need and the switch is experiencing that problem.

Can you provide some outputs? (Attach them as a .txt file please):

show controllers power inline

show power inline

show running-config (you can remove confidential information from this)

Waiting for your responses.

Don't forget to rate.

Rgrds,

Martin, IT Specialist

[Andriy Zatyshnyy]

hi Martin,

i asked customer these commands and now waiting.

Here are characteristics taken from protocols:

Char-s	Catalyst 4510R+E	Catalyst 3560X
Dimensions, sm	61.84 x 43.97 x 31.70	4.45 x 44.5 x 46.0
UNITs	14	1
Nr. Of interface modules	10	-
Мах. Gigabit Ethernet port q-ty	384	52
PoE ports q-ty	288	48
Chassis mass (fans incl.), kg.	24,73	7.4
Nr. Of power supplys	2	1
Power type	110-230 AC	110-230 AC
Max power consumption, Wt.	6916,52	715

[Andriy Zatyshnyy]

Now we got our power statistics in attached file.

KR

Andriy
 

[Martin Moran]

Cool AZatishny.

Before giving you more recommendations I want to know something else:

• CUCM Version
• Firmware version of the IP Phone
• In the CUCM, go to System > LDAP, LDAP Authentication, then check if the "Use LDAP Authentication for End Users" is marked
• In the CUCM, go to System > LDAP, LDAP Directory, then check the schedule for the LDAP Synchronization

Another thing you can do to make sure the authentication is working fine between the phones and the AD is to change the password of a user and AD, then at the phone you can try entering the new password and see if you can log in.

Rgrds,

Martin, IT Specialist

[Andriy Zatyshnyy]

Hi, Martin

Here it is:

•          Cisco Unified CM system version 9.1.2.10000-28
•          СP-6941 Firmware version: SCCP69xx.9-4-1-3

Planned to renew on SCCP69xx.9-4-1-3SR1

•          CUCM System > LDAP, LDAP Authentication, "Use LDAP Authentication for End Users" box is checked:
•          CUCM System > LDAP, LDAP Directory, LDAP  Directory Synchronization Schedule --look over screenshot please.

KR

Andriy

[Martin Moran]

Sorry for the delay. The work got me busy for a while.

I recommend to upgrade to the SR1 firmware version. I found some documentation that says an issue in your current firmware version when a user logs in while a multicast flooding is present in the network. I don't know if it's your case but it's good to try this first.

HTH.

Rgrds,

Martin, IT Specialist