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gabrieled209
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OSPF design

Tue Jun 01, 2021 4:54 pm

HI!!

What would be the best approach?

CONSIDER A MUCH LARGER NETWORK, THIS IS JUST AN EXAMPLE

Image

OPTION A: a larger AREA0 with many small stub areas.
- Advantage: I can summarize the PPPoE clients
- Disadvantages: larger AREA0

OPTION B: smaller AREA0 with larger AREA1
- Advantage: smaller AREA0
- Disadvantages:
- I can summarize the PPPoE clients but only in R2
- larger AREAX... maybe?

OPTION C: mix between A and B... or something like that... (less likely, but I still put it)

On the PPPoE servers there are hundreds of clients, so I need to summarize.

Thanks!
 
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Re: OSPF design

Tue Jun 01, 2021 5:59 pm

If you're going to redesign, it's better to use OSPF, MPLS and BGP together in a design like this:

- Much better scale
- Summarization without area constraints
- Putting only ptp and loopbacks into OSPF improves convergence time sigificantly
- MPLS can be used to aggregate PPPoE sessions to fewer locations

Image

For more general information about iBGP/OSPF/MPLS (not {PPPoE specific) read this article:

https://stubarea51.net/2020/03/03/start ... hitecture/

To use redundant BRAS for scale - read this article

https://stubarea51.net/2018/04/23/pppoe ... atorsbras/
 
gabrieled209
just joined
Topic Author
Posts: 11
Joined: Thu Apr 18, 2013 6:26 pm

Re: OSPF design

Tue Jun 01, 2021 6:36 pm

If you're going to redesign, it's better to use OSPF, MPLS and BGP together in a design like this:

- Much better scale
- Summarization without area constraints
- Putting only ptp and loopbacks into OSPF improves convergence time sigificantly
- MPLS can be used to aggregate PPPoE sessions to fewer locations

Image

For more general information about iBGP/OSPF/MPLS (not {PPPoE specific) read this article:

https://stubarea51.net/2020/03/03/start ... hitecture/

To use redundant BRAS for scale - read this article

https://stubarea51.net/2018/04/23/pppoe ... atorsbras/
Excellent information, i'll read it. Thank you!!

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