It is VERY important to know what interfaces is used for the OSPF router ID, and to make sure that interface is a loopback interface. If you let it choose a normal interface, and that interface goes down, your OSPF process will essentially bounce because it will select another interface IP as the router ID.
Fred Reimer - CCNA Eclipsys Corporation, 200 Ashford Center North, Atlanta, GA 30338 Phone: 404-847-5177 Cell: 770-490-3071 Pager: 888-260-2050 NOTICE; This email contains confidential or proprietary information which may be legally privileged. It is intended only for the named recipient(s). If an addressing or transmission error has misdirected the email, please notify the author by replying to this message. If you are not the named recipient, you are not authorized to use, disclose, distribute, copy, print or rely on this email, and should immediately delete it from your computer. -----Original Message----- From: wj chou [mailto:[EMAIL PROTECTED] Sent: Saturday, August 16, 2003 6:16 PM To: [EMAIL PROTECTED] Subject: router-id in different protocols [7:74054] Hi, I know that in OSPF, router id is not necessary. The interface iP address that's selected to be router id doesn't even need to run OSPF. How about in other routing protocols? For example EIGRP and BGP. What role does router-id play in these protocols? I know that it selects the highest loopback interface IP as router-id if not manually configured, so if EIGRP is not running on this chosen loopback interface, does it still work? Thanks! Also, which protocols actually have a "router id" field in its hello packet? I know OSPF does but I can't find information about EIGRP. thanks a lot! **Please support GroupStudy by purchasing from the GroupStudy Store: http://shop.groupstudy.com FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=74061&t=74054 -------------------------------------------------- **Please support GroupStudy by purchasing from the GroupStudy Store: http://shop.groupstudy.com FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
