Hi Stojanco Please find the config and error message:
SwitchA#sh run int f0/22 Building configuration... Current configuration : 57 bytes ! interface FastEthernet0/22 switchport mode trunk end SwitchB#sh run int f1/0/21 Building configuration... Current configuration : 190 bytes ! interface FastEthernet1/0/21 switchport trunk encapsulation dot1q switchport trunk allowed vlan 1,2,7 switchport mode trunk spanning-tree portfast trunk spanning-tree guard none end I see the following error on switchB 00:04:10: %ETHCNTR-3-LOOP_BACK_DETECTED: Loop-back detected on FastEthernet1/0/21 With regards Kings On Thu, Mar 4, 2010 at 6:59 PM, Stojanco Cavdarov <[email protected]>wrote: > Hi Kings > > Would be great if you can provide config of interfaces, and error that you > get. I'll look into it. > > Also good practice is to fix the trunks and encapsulation and dont rely on > negotiation protocols. > > On Thu, Mar 4, 2010 at 2:13 PM, Kingsley Charles < > [email protected]> wrote: > >> Hi Stojanco >> >> I tried that but I don't see that command in the running configuration and >> also it doesn't disable the loopguard. >> >> >> With regards >> Kings >> >> On Thu, Mar 4, 2010 at 6:33 PM, Stojanco Cavdarov >> <[email protected]>wrote: >> >>> Hi >>> >>> Have you tried: "no spanning-tree loopguard default"? >>> >>> Works for me on Catalyst 4000. >>> >>> >>> On Thu, Mar 4, 2010 at 1:52 PM, Kingsley Charles < >>> [email protected]> wrote: >>> >>>> Hi all >>>> >>>> I have two switches connected to each other and that is trunk. The >>>> switch brings the line down informing loop error. I am not able to find a >>>> command to disable the loopgaurd. >>>> >>>> "spanning-tree loopguard default disable" >>>> >>>> >>>> I only see "spanning-tree loopguard default". How do I disable it? >>>> >>>> >>>> What might be the issue causing this looperror? Loop error happens when >>>> the switch doesn't get the BPDUs right? But everything seems to fine on >>>> both >>>> the switches. >>>> >>>> Is there anything that will stop sending the BPDUs on the other side? >>>> portfast is disable on both the switches. >>>> >>>> With regards >>>> Kings >>>> >>>> _______________________________________________ >>>> For more information regarding industry leading CCIE Lab training, >>>> please visit www.ipexpert.com >>>> >>>> >>> >> >
_______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
