-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Wednesday, August 15, 2001 11:41 AM To: [EMAIL PROTECTED] Subject: RE: router configs/OSPF - interfaces or entire networks? [7:16213] The net statements identifies networks, local to the router, which will participate in OSPF. The net command should designate the network in which the interface belongs. It is not possible to have an interface participate in OSPF w/out the subnet of that interface also participating in OSPF. begin CL comment: technically, you place interfaces into the OSPF process, not networks. In previous discussions here, I recall we concluded that the OSPF process then looks at the interface configurations, and ascertains from that the network to be advertised. Conceptually speaking, there is a difference in placing interfaces versus placing networks into the process. suppose, for example, all my interfaces were numbered x.y.24.z and I used the following command: network x.y.24.z 0.0.0.0 area something what you are telling the OSPF process is to include every interface with an address that matches the address pattern in the OSPF process. from there the networks are determined. Otherwise, why wouldn't the command be network a.b.c.d 255.192.0.0 for example, using the net and mask form? end of CL comment The different scenarios descriptions of what should be advertised is a matter of semantics. They are saying the same thing two different ways. If you have a 255.255.255.252 on and interface don't specify the network as 0.0.0.255 unless you all interfaces with IP's within the /24 block to participate in the same process and area. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Jeffrey Levine Sent: Wednesday, August 15, 2001 12:11 PM To: [EMAIL PROTECTED] Subject: router configs/OSPF - interfaces or entire networks? I have noticed in some lab scenarios that when the instructions say that a router interface should be advertised in a routing protocol, the labs sometimes advertise only the interface, othertimes an entire subnet. For example, let's say it's an ethernet interface with address 192.168.1.1/24 being advertised under OSPF. I've seen the following: router ospf 64 net 192.168.1.1 0.0.0.0 area 0 or router ospf 64 net 192.168.1.1 0.0.0.255 area 0 I wouldn't be concerned if there were some consistency. I've seen the lab instructions state "interface" and then seen the entire network advertised and vice-versa. Any thought? Jeffrey S. Levine _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp **Please read:http://www.groupstudy.com/list/posting.html Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=16259&t=16259 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
