Comments on: Tutorial: OSPF Network Types and Frame Relay Part 2

By: Jit Anbu

Jit Anbu — Sat, 18 Jul 2009 11:38:43 +0000

Nice article!

You might want to add (in the summary section) that in point-multipoint NBMA the HUB router needs to statically assign a neighbour statement to its SPOKES under the OSPF process.

Jit

By: modem

modem — Sat, 14 Feb 2009 20:51:11 +0000

great article. i study for the bsci and the books are lacking explanations:
1. why dont you need DR on **some** topolofgies?
2. why do you **somtimes** need to configure manually the neighbors?

only now, thanks to you, i discovered the difference between RFC’s NBMA and Cisco’s P2MP-NB.

By: Davy

Davy — Wed, 29 Oct 2008 10:42:32 +0000

great articles!

1 remark, in the article is said:

OSPF treats Point-to-Multipoint networks as a collection of point-to-point links. A DR/BDR is not required in these networks as OSPF Packets are unicast to known neighbors.

Shouldn’t this be multicast? for discovering the neighbours. Otherwise there is no difference with the ‘point-to-multipoint no broadcast’ type.

By: Arden Packeer, CCIE #20716

Arden Packeer, CCIE #20716 — Tue, 15 Jul 2008 01:54:27 +0000

Thanks Mar! All fixed. :)

By: Mar Apuhin

Mar Apuhin — Sun, 13 Jul 2008 12:57:14 +0000

Hi Arden,

Should this be 30? instead of 10?

“You can see the default timers for a point-to-multipoint non-broadcast network are 10 seconds and 120 seconds for the hello and dead intervals respectively.”

Nice Tutorials. Thanks.

http://cciepilot.wordpress.com