No, we don't have portfast bpdu-guard enabled. What does it do? Thanks Larry!
Thomas ""Larry Letterman"" wrote in message news:[EMAIL PROTECTED] > port mac address security might work, altho its a lot of admin > overhead..are you running portfast bpdu-guard on the access ports? > > > Larry Letterman > Network Engineer > Cisco Systems > > > ----- Original Message ----- > From: Thomas N. > To: [EMAIL PROTECTED] > Sent: Tuesday, April 01, 2003 8:14 PM > Subject: VLAN loop problem [7:66656] > > > Hi All, > > I got a problem in the production campus LAN here between VLANs. Please > help me out! Below is the scenario: > > We have VLAN 10 (10.10.x.x) and VLAN 20 (10.20.x.x) subnets. Routing is > enable/allowed between the two subnets using MSFC of the 6500. Each subnet > has a DHCP server to assign IP address to devices on its subnet. > Spanning-tree is enable; however, portfast is turned on on all > non-trunking/uplink ports. Recently, devices on VLAN 10 got assigned an IP > address of 10.20.x.x , which is from the DHCP on the other scope and also > from 10.10.x.x scope, and vice versa. It seems that we a loop somewhere > between the 2 subnets but we don't know where. I noticed lots of end users > have a little unmanged hub/switch hang off the network jacks in their > cubicals and potentially cause loop. > > Is there any way that we can block the loop on the Cisco switches without > visiting cubicals taking those little umanaged hubs/switches? Thanks! > > Thomas Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=66699&t=66656 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
