From: James (james@towardex.com)
Date: Sun Jun 20 2004 - 05:22:42 GMT-3
The OSPF broadcast requires that all adjacent neighbors to be on the same
layer2 reachability path / broadcast domain to the DR. In your case , you are
manually mapping each end point address to a DLCI using frame maps, thereby
allowing broadcast mode to work. However, when one of your PVC knocks offline,
your frame-relay ip mapping for the affected PVC is offline, thereby breaking
the broadcast requirement model. Or in other words, if the PVC between router A
and router B is broken, then you just lost layer2 connection between the two. If
router A is your broadcast DR, you just lost your layer2 connectivity to DR.
As recommended in the URL, a good workaround is attempt point to multipoint,
or use frame-relay mappings through a hub-and-spoke topology, designating hub
as the DR, or simply use point-to-point subinterface PVC's with /30 on them
and establish seperate ospf adjacency per sub-if.
-J
On Sun, Jun 20, 2004 at 09:45:55AM +0300, ali wrote:
> Dear All
> I am trying to understand what is the problem exactly and how I can solve it
> in this url but I didnt underhanded very well can anybody help me on that
>
> http://www.cisco.com/en/US/tech/tk365/tk480/technologies_tech_note09186a0080
> 094051.shtml
>
>
> Ali
>
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-- James Jun TowardEX Technologies, Inc. Technical Lead Network Design, Consulting, IT Outsourcing james@towardex.com Boston-based Colocation & Bandwidth Services cell: 1(978)-394-2867 web: http://www.towardex.com , noc: www.twdx.net
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