thanks again walt Walt Witkowski Primary Network Specialist - Sungard Higher Education Office of Information Technology - Delaware County Community College 610-359-5017(phone) / 610-359-4123 (fax)/856-217-4430(cell) [email protected]
>>> "D'Estienne, Michael" <Michael.D'[email protected]> 8/3/2011 2:44 PM >>> can't comment on your fw config...but if that is what generates a default route down to the cores, yes, that will work. each core will receive a default route from their directly connected fw via ospf. then the cores will exchange default routes but will prefer the default from the fw due to cost factor. Mike From: [email protected] [mailto:[email protected]] On Behalf Of Walter Witkowski Sent: Wednesday, August 03, 2011 2:41 PM To: Enterasys Customer Mailing List Subject: RE: [enterasys] OSPF default route sharing I forgot to mention there is a routed OSPF path between these cores (Enterasys S4's). So if I am following you correctly. With both cores running OSPF I should remove the default route statements from each. In the firewall where I have the default route pointed to the ip address of F5 internet router (load balancer) I would select the "Allow Redist Default Route" and let OSPF redistribute. Each of the cores would then understand their direct connections to the firewall as the shortest path for default traffic and also be able to recover if that path fails (using the other router as it path for default traffic). thnks again Walt >>> "D'Estienne, Michael" <Michael.D'[email protected]> 8/3/2011 2:10 PM >>> depends on the type of default route being used. and the cores should be ospf neighbors to begin with. 1) static default route up to the fw: the static route will need to be dumped into ospf. which will allow the local default route to be propagated to the other core via ospf. if you use a static route, this will expose you to other scenarios where the other core won't be used and traffic will be black holed. 2) ospf learned default route: as long as the 2 cores are running ospf, each will install the other's default route as backup. Mike From: [email protected] [mailto:[email protected]] On Behalf Of Walter Witkowski Sent: Wednesday, August 03, 2011 1:38 PM To: Enterasys Customer Mailing List Subject: [enterasys] OSPF default route sharing Hi all! We currently have a single connection from one of two core routers to our internet firewall. We are going to connect both cores to the firewall each with their own layer 3 (/30) connection. Each core router will point to the corresponding ip address on the firewall as its default gateway. My question is if either one of the core default route connections should fail will the opposite core advertise it's default route to the failed router? How is this actually accomplished? Does each router advertise its default route to the other? Does each router hold this as a learned route in OSPF and not use it because it is not directly connected, and only uses it if the primary or directly connected route fails? Am I on the right track? thnks in advance Walt * --To unsubscribe from enterasys, send email to [email protected] with the body: unsubscribe enterasys Michael.D'[email protected] --- To unsubscribe from enterasys, send email to [email protected] with the body: unsubscribe enterasys [email protected] * --To unsubscribe from enterasys, send email to [email protected] with the body: unsubscribe enterasys Michael.D'[email protected] --- To unsubscribe from enterasys, send email to [email protected] with the body: unsubscribe enterasys [email protected] --- To unsubscribe from enterasys, send email to [email protected] with the body: unsubscribe enterasys [email protected]
