![]() Then again, I am not using them myself and I am merely reflecting upon my best knowledge and overview of what issues have been discussed on these forums so far. I am not aware of any interoperability issues. successfully bundled, in the show etherchannel summary output?Īre the servers and/or the VMWare configured to perform any kind of switching/bridging? What signalling protocol are you using? Are the Port-Channels configured with LACP or with just the "on" mode? Are all devices reporting all bundled ports as (SU), i.e. I see you are using cross-stack EtherChannels. If not then this is the first thing to do, and to do very, very carefully. The most obvious reason would be a switching loop in your network but I assume you have double and triple checked the show spanning-tree outputs on all switches and verified with utmost scrutiny that all ports are placed in the exact STP role and state as they are supposed to be. The hard question is - which device is doing this? What you are experiencing is caused by some devices sending the LOOP frames back to the switches and their ports where these LOOP frames were sent from. PS I`m no vmware guy but is there any chances that some virtual machines caused this ?įor an in-depth discussion of what are the LOOP frames that are activated/deactivated using the keepalive commands, see this (lengthy) thread: I looked into spanning tree problems/logs everything is fine.As soon as i put the keepalives back on 3012 etherchannel interfaces the port enters err-disabled state. I run some testing on cables all the test were fine. The only workaround was to disable the keepalives on that interfaces. (of course i`m using gigabit ,the error message is copy paste from some documentation but the error is the same) %PM-4-ERR_DISABLE: loopback error detected on Fa0/3, putting Fa0/3 in err-disable state %ETHCNTR-3-LOOP_BACK_DETECTED: Keepalive packet loop-back detected on FastEthernet0/3. The design worked ok for some weeks then suddenly almost all the 3012 etherchannel uplinks goes into Err-disable with this error. One of the G switches is the master of the stack. I have a core of mixted 2X3750G and X using the latest IOS. We are migratig some machines from phisical to virtual (vmware). I have a datacenter like in the diagram, in the diagram i have only two rack but in reality there are more. I already open a TAC case but meanwhile i want to discuss this problem that i`m facing. This is big, i have a problem in one datacenter, and i really need some help.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |