PVST+ enable = power cycle on 6850-U24X

[Tyson]

I am working with a fairly large network of mixed Cisco/Alcatel equipment which is performing less than ideally. I have found some problems with Spanning Tree (ie multiple devices consider themselves the root for a single vlan). Manually adjusting root bridge priority has made no difference. I have now discovered that while the Cisco equipment is running PVST+, the Alcatel equipment is running 1X1 but PVST+ is disabled. I enabled PVST+ via "bridge mode PVST+ enable". Immediately the device fell offline, reloaded to the working configuration, and simply disregarded the PVST+ enable command.

I'm certain I missed something here, I just can't come up with what it may be. Any help is greatly appreciated.

Thanks.

J. Tyson

[benny]

Are you running AOS 6.4.2.807.R01? If yes I would recommend to upgrade the switch to the latest maintenance release and if this doesn't help open a SR with Alcatel-Lucent.

-benny

[ren833]

Like Benny said, Firmware first.
Then:
Usage Guidelines
• In order to handle PVST+ mode, the ports must be configured in 1x1 mode.
• This command enables the ports to handle PVST+ BPDUs.
• In this mode, the bridge priority field of the bridge ID can only be changed by a multiple of 4096
Examples:
-> bridge mode 1x1 pvst+ enable
-> bridge mode 1x1 pvst+ disable
OR:
Usage Guidelines
• In order to handle PVST+ mode, the ports must be configured in 1x1 mode.
• Initially, a port sends or receive IEEE BPDUs. Once a PVST+ BPDU is received, the port will send
and receive only PVST+ BPDUs for tagged VLANs and IEEE BPDUs for default VLANs

Examples
-> bridge port 1/3 pvst+ enable
-> bridge port 2/2 pvst+ auto

[Tyson]

Thanks for the information guys. We ended up pulling the device and replacing it with a spare unit on site. The original is on its way to Alcatel.

[dzoki]

I have the same situation, but in new switch OS6360-P48 with AOS 8.7.252.R02 d, they dont have bridge mode 1x1 pvst+ enable, but i configured like this:
! Spanning Tree:
spantree pvst+compatibility enable
spantree vlan 1 admin-state disable
spantree vlan 10 admin-state disable
spantree vlan 11 admin-state disable
spantree vlan 40 admin-state disable
spantree vlan 64 admin-state disable
spantree vlan 65 admin-state disable
spantree vlan 68 admin-state disable
spantree vlan 69 admin-state disable
spantree vlan 70 admin-state disable
spantree vlan 71 admin-state disable
spantree vlan 82 admin-state disable

If I enable spantree vlan 1 mgmt port on Alcatel become unavailable.
Can someone help me?

[Alcatelteltel]

is there a difference between this 2 configs ?

-> bridge mode 1x1
-> bridge mode 1x1 pvst+ enable

[silvio]

1x1 ist the Alcatel own perVlan mode (instead of flat mode). You can switch this 1x1 mode to be compatible with cisco pvst+
BR Silvio