From: Rohan Grover (rohang@cisco.com)
Date: Wed Jul 07 2004 - 11:34:10 GMT-3
Hi,
There are 5 ways in which you can do it
1)Use neighbour command on Hub router and make sure hub router is DR using 'ip ospf priority'. Also all other spoke routers should
be ineligible to be BDR. Prior to IOS 11.0 (I think) this way the only method.
2)Use 'ip ospf network broadcast' under FR interface. This removes the necessity for neighbour command. But you still need to
explicitly make the hub router as DR. Make sure 'frame-relay map' has broadcast keyword.
3)Use 'ip ospf network point-multipoint' under FR interface. This wll cause ospf to treat all links as p-p links and doesn't need
DR-BDR election. Make sure 'frame-relay map' has broadcast keyword.
4)Use 'ip ospf network point-point'. This is the easient method. All links have to be P-P though and you'll have multiple subnets.
5)Use 'ip ospf network point-to-multipoint non-broadcast'. This would be used for FR svcs, which don't want the OSPF packets to be
multicast but unicast. Neighbour config is required here.
I don't think Frame-Relay SVC is part of CCIE lab.
Thanks
Rohan
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Daniel Sheedy
Sent: Wednesday, July 07, 2004 6:39 PM
To: James; ccielab@groupstudy.com
Subject: Re: OSPF Config methods - Frame Rel
Hi James,
When they are talking about 5 ways, I think they are talking about the types of ospf network available
point-to-point
point-to-multipoint
point-to-multipoint non-broadcast
broadcast
non-broadcast
Dan Sheedy
----- Original Message -----
From: "James" <james@towardex.com>
To: <ccielab@groupstudy.com>
Sent: Wednesday, July 07, 2004 3:02 PM
Subject: OSPF Config methods - Frame Rel
> Hi all,
>
> So I hear there are 5 different ways to configure OSPF over
> frame-relay network..
>
> AFAIK, the couple ways that are popular are:
> o Configure OSPF over point-to-point subinterfaces using /30 per
> subint,
and
> create seperate broadcast domain + adjacency over each interface.
> o Configure OSPF over hub-and-spoke topology via point-to-multipoint. Hub
> router can be set as DR.
>
> What are some other popular ways people use to conf OSPF over frame
networks,
> both in real life and in CCIE lab environment? (Or did I hear
> something
wrong in
> that someone said there are 5 ways? :-P)
>
> Thanks!
> -J
> --
> 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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