[c-nsp] Etherchannel guard vs. mstp]

[Mateusz Blaszczyk]

I would suggest a reload after changing the spanning tree mode

2009/3/10 Nemeth Laszlo <csirek at cooler.hu>:
> Hi
>
> I make a mistake in the Routers name.
>
> This is the good version:
>
> I have a 7600/RSP720-3CXL with advipservicesk9-mz.122-33.SRC3.bin
> (this is Router A), 6500/SUP720-3BXL with ipservicesk9-mz.122-18.SXF13.bin
> (this is Router B) and a C 6500/3BXL with ipservicesk9-mz.122-18.SXF6.bin
> (Router C)
>
> The topology is:
>
> Router A  == 4x10G (lacp) ==  Router B  == 2x10G (pagp) ==  Router C
>
>
> All routers run Rapid-PVSTP.
>
> I needed to change the STP from RSTP to MSTP on all devices.
>
> The first router was the Router A. It changed without problem.
> But when i sent the "spanning-tree mode mstp" to Router B it put down
> the 4x10G Etherchannel link with Router A and logged it:
>
> Mar  9 16:04:57.669 MET: %PM-SP-STDBY-4-ERR_DISABLE: channel-misconfig
> error detected on Te1/3, putting Te1/3 in err-disable state
> Mar  9 16:04:57.677 MET: %PM-SP-STDBY-4-ERR_DISABLE: channel-misconfig
> error detected on Te1/4, putting Te1/4 in err-disable state
> Mar  9 16:04:57.685 MET: %PM-SP-STDBY-4-ERR_DISABLE: channel-misconfig
> error detected on Te2/3, putting Te2/3 in err-disable state
> Mar  9 16:04:57.701 MET: %PM-SP-STDBY-4-ERR_DISABLE: channel-misconfig
> error detected on Te2/4, putting Te2/4 in err-disable state
>
> Mar  9 16:04:57.641 MET: %PM-SP-4-ERR_DISABLE: channel-misconfig error
> detected on Po3, putting Te1/3 in err-disable state
> Mar  9 16:04:57.653 MET: %PM-SP-4-ERR_DISABLE: channel-misconfig error
> detected on Po3, putting Te1/4 in err-disable state
> Mar  9 16:04:57.665 MET: %PM-SP-4-ERR_DISABLE: channel-misconfig error
> detected on Po3, putting Te2/3 in err-disable state
> Mar  9 16:04:57.673 MET: %PM-SP-4-ERR_DISABLE: channel-misconfig error
> detected on Po3, putting Te2/4 in err-disable state
> Mar  9 16:04:57.685 MET: %PM-SP-4-ERR_DISABLE: channel-misconfig error
> detected on Po3, putting Po3 in err-disable state
>
>
> The Etherchannel with Router C stilled UP only the Router A went down.
>
> If i deleted and recreated the port channel with LACP or PAGP or other
> etherchannel number, the result always it: put down the links.
>
> If i changed back to RSTP on the Router B, all links went UP with router
> A and it's working without problem.
>
> So the topology now is: Router A runs MSTP, router B runs RSTP and
> router C runs  RSTP too.
>
> I think the STP's etherchannel guard put down the link, but i don't
> found any bug that made this problem in the BugTool at Cisco.com.
>
> Any idea?
>
> Thanks
>
> Laszlo
>
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