OSPF in NBMA

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Two offices have to be connected together via an NBMA frame relay
connection, and running OSPF across this network. What kind of configuration
structure should be used?

A. Point-to-point over sub-interfaces.

B. Point-to-multipoint star configuration.

C. None of the above.

My answer: A cause using point to point subinterfaces will eliminate the
issues surrounding split horizons over NBMA networks.

What do you guys think?




Re: OSPF in NBMA


I think the clue lies in "Two offices have to be connected together  ...."

Saad Ahmed wrote:
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Re: OSPF in NBMA


will u go with A?

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configuration




Re: OSPF in NBMA


Point to point sub-interfaces are generally favored to allow for flexibility
in maintaining the configurations going forward.  Split-horizon is not an
issue for OSPF, but may be an issue for other routing protocols that may
also share the physical interface at some point.

FWIW,
Robert

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Re: OSPF in NBMA


I'll go with A.

Split-horizon is not an issue for OSPF, but may be an issue for distance
vector (including EIGRP) routing protocols that may also share the physical
interface at some point.

Since there are just 2 sites connected to each other via NBMA frame-relay
and no requirement for one to be a multipoint hub, point to point
sub-interfaces are generally favored to allow for flexibility in maintaining
the configuration.

FWIW,
Robert

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