See Inline... >From: "Howard C. Berkowitz" >Reply-To: "Howard C. Berkowitz" >To: [EMAIL PROTECTED] >Subject: Re: (correction) Method and Process Scenario 5: OSPF [7:42139] >Date: Sun, 21 Apr 2002 18:03:20 -0400 > > >Howard, > > I think I see where you're going. The default on the "DIO" > >command is > >applying an "E2" to the default as it is sent into the enterprise. It is > >also > >known that by order of preference that "E2" routes are least preffered. > >So based > >on your hint.. I'm thinking making use of the "metric-type" parameter to > >make > >the default-route an "E1" metric which would provide known route info > >into the > >ISP's network. Nope..this isn't it. > >STOP! Using E1 is the answer, although I don't think you have the >reason quite right. On the default-information originate command, >use metric-type 1 and an equal metric on both routers. > >E1 considers the combined internal and external metric. If you make >the external metrics equal, traffic in your network will go to the >closest exit. If the network topology is reasonably well designed >with the placement of your gateways, this should give approximate >sharing of both internal resources and the ISP links. > >Again, this is outwards toward the ISP. Without BGP, you aren't >going to influence inbound sharing.
Since we're using OSPF between the ISP POPs and the enterprise couldn't a case be made here for the use of well design IP scheme. This would allow for geographic/location specific summarization with the use of route-tagging/filtering to provide some control over in-bound traffic from the ISP into the enterprise. Thoughts.. anyone? Nigel > >In thinking about this even more when I was posting the very first > >time to this thread I taught..yes, that's it..but opt'd not to mention > >it. > >Now it dawns on me that the default nature of (cisco's)ospf is to use 4 > >equal-cost > >routes. So now "maximum-paths 2" sounds like the way to go. > > >No, for a couple of reasons. > >First, OSPF will generate only one external route to the same >destination in the same router. So load balancing on the same >router, which uses maximum-paths, will never take place with OSPF >default. > >Second, what you want is load-sharing with the scope of your OSPF >_domain_, not the scope of one router. > > > > >the hint knocked me over the head..:-> > > > >Nigel > > > >-- >"What Problem are you trying to solve?" >***send Cisco questions to the list, so all can benefit -- not >directly to me*** >******************************************************************************** >Howard C. Berkowitz [EMAIL PROTECTED] >Chief Technology Officer, GettLab/Gett Communications http://www.gettlabs.com >Technical Director, CertificationZone.com http://www.certificationzone.com >"retired" Certified Cisco Systems Instructor (CID) #93005 > > > > >Message Posted at: >http://www.groupstudy.com/form/read.php?f=7&i=42175&t=42139 >-------------------------------------------------- >FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html >Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ------------------------------------------------------------------------ Send and receive Hotmail on your mobile device: Click Here Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=42197&t=42139 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
