From: Georg Pauwen (pauwen@hotmail.com)
Date: Sun Dec 19 2004 - 06:27:25 GMT-3
Hello,
the problem with OSPF and multilink is that when one of the links in the
multilink bundle goes down, OSPF recalculates the cost of the link and runs
the SPF algorithm, causing a topology change and hence the demand circuit to
come up. You need to manually set the cost on your dialer interfaces, e.g.
ip ospf cost 10.
You might want to check this document, it explains this phenomenon (reason
6):
Why OSPF Demand Circuit Keeps Bringing Up the Link
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a008009481b.shtml
Regards,
Georg
>From: "Lai, Ben" <benlai_cn@hotmail.com>
>Reply-To: "Lai, Ben" <benlai_cn@hotmail.com>
>To: <ccielab@groupstudy.com>
>Subject: Using Dialer Profile as OSPF Demand-circuit
>Date: Sun, 19 Dec 2004 08:49:10 +0800
>
>Hi all,
>
>Here's a problem I met when using ISDN Dialer Profile for OSPF
>demand-circuit, It was:
>
>There are two router running OSPF with a serial interface and a BRI
>interface. Running AREA 0 between Serials and a virtual link area between
>BRIs, When I using the Phycisal BRI interface with the Demand-circuit
>function, It works well, But when I use the Dialer profile with the PPP
>Multilink, the ISDN link keeps up and down. I debug ip ospf hello, there's
>no hello packet pass the Dialer OR BRI interface, but the dial reason is
>"s="my ip add, d=224.0.0.5". Anybody could tell me why?
>
>
>
>Thanks
>
>
>
>Ben
>
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