that is correct.
Larry Letterman Cisco Systems [EMAIL PROTECTED] -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of EFIRD, TREECE (CONTRACTOR) Sent: Tuesday, April 02, 2002 7:06 AM To: [EMAIL PROTECTED] Subject: RE: root switch [7:39975] I'm assuming that the use of spantree portfast is coupled with the use of this command: set spantree portfast bpdu-guard enable When this command is applied to the switch, and it will prevent a port configured as a end-station port from being used as an uplink port from another switch. Any BPDUs (Bridge Protocol Data Units) seen on a port where the macro command "set port host" (or in this case "set spantree portfast") has been applied will cause the port to go into an "errDisable" state. The use of this command is intended to prevent unauthorized switching devices from being connected to the LAN via the user ports. We use it in our organization, and it is effective. Treece -----Original Message----- From: Priscilla Oppenheimer [mailto:[EMAIL PROTECTED]] Sent: Monday, April 01, 2002 5:14 PM To: [EMAIL PROTECTED] Subject: RE: root switch [7:39975] At 01:50 AM 4/1/02, Larry Letterman wrote: >For the most part here at Cisco, we have no guarrantee >that setting a switch to root will stop another switch from coming up >as root. However, we set all our roots/sec roots by issuing the set >spantree root command. This should lower the prio. of the root/sec root >switches to insure that they will always be the roots... > >We also use portfast to insure no unwanted switches are plugged into >our network and allowed to become live.... Does that really work? A port in portfast mode still listens to BPDUs in case another switch instead of a workstation gets connected. If another switch gets connected, the port will do its normal blocking, listening, learning, and forwarding state transitions. I don't think just configuring portfast will stop an unwanted switch from becoming live?? Were you thinking of something else maybe? Thanks, Priscilla >Larry Letterman >Cisco Systems >[EMAIL PROTECTED] > > >-----Original Message----- >From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] >Sent: Sunday, March 31, 2002 10:12 PM >To: [EMAIL PROTECTED] >Subject: RE: root switch [7:39975] > > >as you know, my switch doesn't become a root swtich,so i set a higher >priority in my switch,which method can be sure my swithc never come to >root? thanks. ________________________ Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=40206&t=39975 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
