s8700 and 4620 phones spanning tree issue

[dwifty]

Hi all,
we have an S8700 with CM4 and 4620 phones on fw 2.8

One of our customers managed to plug both jacks on the back of one of the phones in to two live network points. This caused a spanning tree loop and brought the network to a standstill.

The customer is adamant that their cisco switchs are set up to handle spanning tree and that they have STP turned on.

Is there anything that should be set on the phone ? firmware ? setting file ?

Any thought on this would be appreciated.

thanks
D

 

[Mitch672]

They essential plugged network A into network B, I don't think there is anything that can prevent that from causing ALL kinds of havoc.

You can't make it idiot-proff, because idiots are so creative

mitch


AVAYA Certified Specialist

 

[Mitch672]

Ah ther eis one thing you COULD try. In your 46xxsettings.txt file, SHUTDOWn the secondary ethernet port on the IP phones

SET PHY2STAT 0

################## ETHERNET INTERFACES ###################
##
## Primary Interface Status
## Controls the speed and duplex settings for the primary
## Ethernet interface.
## 1 for auto-negotiate
## 2 for 10Mbps half-duplex
## 3 for 10Mbps full-duplex
## 4 for 100Mbps half-duplex
## 5 for 100Mbps full-duplex
## 6 for 1Gbps full-duplex (96xx phones only)
SET PHY1STAT 5
##
## PC Interface Status
## Controls the speed and duplex settings for the PC
## Ethernet interface.
## 0 for disabled
## 1 for auto-negotiate
## 2 for 10Mbps half-duplex
## 3 for 10Mbps full-duplex
## 4 for 100Mbps half-duplex
## 5 for 100Mbps full-duplex
## 6 for 1Gbps full-duplex (96xx phones only)
SET PHY2STAT 0

mitch



AVAYA Certified Specialist

 

[uzumaki]

I think spanning tree is disabled on all avaya equipments, I had this issue when we are integrating the Avaya Cajun Switches on Cisco Catalyst. Being disabled, naturally causes loops.

The only thing to do is to disable the port just like mitch said.

 

[DTLegend]

You could, from the IP-Phone, hit the (mute) button and 4, 6 & 8 #. That command will allow you to disable the 2nd ethernet port. Why are they not plugging their computers in the 2nd eth. port?

 

[rejackson]

I believe the ports on a 4620 are a network hub (repeater) not a switch like on the 4620SW. If they are really using 4620 then the problem is in the Cisco switch. Typically they would have portfast set on user ports which would allow the STP loop for a while but should shut it down after about 90 seconds. (It fowards on the ports right away while is running the spanning tree loop check instead of waiting for it to finish.) If the problem lasts longer than that then they had stp turned off on that vlan. make sure they understand that stp is on/off by vlan.

If the phones are 4620SW then they are data switches and they have to run STP to prevent loops. If you can prove that they are then the problem could still be the Cisco.