Loopbacks are handy for use with ip unnumbered. If you have a multipoint interface using subinterfaces you could give every subinterface the same address and keep everything on the same subnet.
They're also handy for DNS. If your router hostname resolves to its loopback address you'll be able to reach the router using the hostname as long as there is at least one real interface up. If you were to resolve the name to an actual interface address you wouldn't be able to reach the router at all of that interface were down. John >>> Wilmes, Rusty 7/31/03 4:49:11 PM >>> our remote routers are configured to do ddr through the loopback interface. -----Original Message----- From: Larry Letterman [mailto:[EMAIL PROTECTED] Sent: Thursday, July 31, 2003 1:40 PM To: [EMAIL PROTECTED] Subject: RE: Loopback Interface [7:73305] To monitor the router, since its up/up if the router is up. Larry Letterman Cisco Systems -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of DeVoe, Charles (PKI) Sent: Thursday, July 31, 2003 12:16 PM To: [EMAIL PROTECTED] Subject: Loopback Interface [7:73305] I know the loopback interface is useful for assigning the router ID. Is there any other purpose? Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=73324&t=73305 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
