John, There are 5 ospf network types:
1. point-to-point - such as T-1, valid neighbors on each end will always become adjacent. 2. Broadcast - such as ethernet, token ring, and FDDI. Broadcast network are capable of connecting more than 2 devices. OSPF routers on the broadcast network will elect a DR and BDR. 3. NBMA (non-broadcast multi-access) such as X.25, frame-relay, and ATM. Capable of connecting more than 2 routers but no broadcast capability. Extra configuration must be done for routers on these network to acquire their neighbors. 4. Point-to-multipoint - Special configuration of NBMA networks. NBMA networks are treated as a collection of point-to-point links. Router on these networks do not elect a DR and BD and because their network is seen as point-to-point links, packets are unicast. 5. Virtual Links - Interpreted by the router as unnumbered point-to-point network. All that being said, PPP over HDLC the default network type is point-to-point as listed in #1 above. When I can't seem to get OSPF working across circuits I look at things like, network type, ensure my subnet masks are correct in the network statement. Also turns on debug ip ospf adj, that will tell you where the adjacency process is failing. Good Luck Debbie On Tue, 7 Jan 2003, John Brandis wrote: > G'Day all > > 1). Have 2 routers at the moment connected back to back. can see each s0 int > on each router after the connection is up. For some reason, I cant seem to > start the ospf process across this link. The code "I think" is ok. > > router a > interface Serial0 > ip address 192.168.1.5 255.255.255.252 > encapsulation ppp > no ip mroute-cache > no fair-queue > router ospf 10 > network 10.64.18.0 0.0.0.255 area 2 (this is the ethernet LAN) > network 172.17.1.2 0.0.0.0 area 0 (this is the loopback int) > network 192.168.1.6 0.0.0.0 area 0 (this is the s0 interface) > > router b > interface Serial0 > description 56k Link to Sydney via TPIPS > ip address 192.168.1.6 255.255.255.252 > encapsulation ppp > ip ospf priority 255 > bandwidth 56 > clockrate 56000 > ! > router ospf 10 > network 192.168.1.6 0.0.0.0 area 0 (this is the s0 int) > network 172.17.1.1 0.0.0.0 area 0 (this is the loopback) > network 10.64.0.0 0.0.1.254 area 7 (this is the ethernet LANS -know > may not work due to fact its got secondary) > ! > > Also, does OSPF make any assumptions about the network type if it is not > specified, and if not, what are the default settings for OSPF interface > network types ( hope that makes sence) > > John > Sydney Australia > > > > ********************************************************************** > > visit http://www.solution6.com > > UK Customers - http://www.solution6.co.uk > > ********************************************************************** > > The Solution 6 Head Office and Branch in Sydney is moving premises. > > >From Monday 25th November our Head Office and NSW Branch will be located at: > > Level 14, 383 Kent Street, Sydney NSW 2000. > > General Phone: 61 2 9278 0666 > > General Fax: 61 2 9278 0555 > > ********************************************************************** > > This email message (and attachments) may contain information that is > confidential to Solution 6. If you are not the intended recipient you cannot > use, distribute or copy the message or attachments. In such a case, please > notify the sender by return email immediately and erase all copies of the > message and attachments. Opinions, conclusions and other information in > this message and attachments that do not relate to the official business of > Solution 6 are neither given nor endorsed by it. > > ********************************************************************* Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=60504&t=60485 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
