Question of OSPF Over DDR [7:28666]
hi, all I have a question about OSPF over DDR. The lab scenario is: 1. RTA and RTB connect with each other using back-to-back connection with serial PPP connection, and use the asynchronous interface as the backup interface. 2. And on each router there is a ethernet interface as a stub network. All the networks run ospf and belong to 3 areas respectively. PPP and its backup links are all in the area 0. 3. I have use the broadcast key word in the rout map, and correctly define the dialer-list with ip permit. Question: When the primary PPP link is down, the DDR works correctly. But there is not hello packet can be find on the DDR. When I show the interface asynchronous 1 under the ospf, I find that: no hellos (passive interface). What is mean? Why? can not explain it. Can you help me? Thanks a lot. Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=28666t=28666 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Question of OSPF Over DDR [7:28666]
By design, hellos and lsa's are surpressed. Do a search on CCO for a demand circuit for further info.. [EMAIL PROTECTED] (Aaron ZHAO) wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... hi, all I have a question about OSPF over DDR. The lab scenario is: 1. RTA and RTB connect with each other using back-to-back connection with serial PPP connection, and use the asynchronous interface as the backup interface. 2. And on each router there is a ethernet interface as a stub network. All the networks run ospf and belong to 3 areas respectively. PPP and its backup links are all in the area 0. 3. I have use the broadcast key word in the rout map, and correctly define the dialer-list with ip permit. Question: When the primary PPP link is down, the DDR works correctly. But there is not hello packet can be find on the DDR. When I show the interface asynchronous 1 under the ospf, I find that: no hellos (passive interface). What is mean? Why? can not explain it. Can you help me? Thanks a lot. Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=28669t=28666 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Question of OSPF Over DDR [7:28666]
I have a question about OSPF over DDR. The lab scenario is: 1. RTA and RTB connect with each other using back-to-back connection with serial PPP connection, and use the asynchronous interface as the backup interface. 2. And on each router there is a ethernet interface as a stub network. All the networks run ospf and belong to 3 areas respectively. PPP and its backup links are all in the area 0. 3. I have use the broadcast key word in the rout map, and correctly define the dialer-list with ip permit. Question: When the primary PPP link is down, the DDR works correctly. But there is not hello packet can be find on the DDR. When I show the interface asynchronous 1 under the ospf, I find that: no hellos (passive interface). What is mean? OSPF Hellos are supressed over a dial-on-demand routing circuit. Why? can not explain it. Can you help me? Reason - the only information that should travel over the demand circuit are real data and routing changes. Once the link is up, OSPF assumes it's reliable and suppresses Hello's so that the Hello's don't cause the circuit to stay up all the time. If you have Internet access, search the Cisco website (www.cisco.com) for OSPF Design Guide for a more detailed explanation of demand circuits and virutal links and other important OSPF qualities. _ Do You Yahoo!? Get your free @yahoo.com address at http://mail.yahoo.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=28708t=28666 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
