Basic question on BGP running on Core Layer switch??

Answered Question
May 3rd, 2007
User Badges:

Folks, can you help me here?

Please find pasted two questions on the diagram attached. Thanks again.



Attachment: 
Correct Answer by paolo bevilacqua about 10 years 2 months ago

From a campus design point of view, fiber is associated to switches for reasons of performance. Probably the 4700 can do most what the 7200 does, but if you think you may need more features or a real router for whatever reason, keep the 7200. If you have traffic enough, you will need NPE-G1 or G2 on it.

Correct Answer by mohammedmahmoud about 10 years 2 months ago

Hi,


The Cat 4500 switch might be running BGP, in order for the 7200 and the Backup router to be able to run iBGP together (if the switch is acting as a layer3 switch and not a layer 2 switch).


When talking about replacing the T1s with fiber, why eliminating the 7200 ?



HTH, please rate all helpful replies,

Mohammed Mahmoud.

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 5 (2 ratings)
Loading.
Danilo Dy Thu, 05/03/2007 - 18:29
User Badges:
  • Blue, 1500 points or more

Hi,


We could explain more if we know what is configured in the backup router on top.


I have some hunch. Maybe the backup router on top is not running BGP and is used as hop router? The Cat4500 is running eBGP multihop through the backup router (top) path because the Cat4500 doesn't have T1 interface/module?


If you replace the two T1 connected to 7200 Router with Fibre, how about the T1 connected to Cat6509?


Fibre cost justification:

- You can use the 7200 router for other purposes

- The annual operation and hardware maintenance cost of the 7200 router is higher than the fibre port

- Simplify the design and routing configuration


Dandy

news2010a Sat, 05/05/2007 - 07:42
User Badges:

I see that hte "router" on the top is running BGP as well. It is also configured for VPN.

Correct Answer
mohammedmahmoud Sat, 05/05/2007 - 08:15
User Badges:
  • Green, 3000 points or more

Hi,


The Cat 4500 switch might be running BGP, in order for the 7200 and the Backup router to be able to run iBGP together (if the switch is acting as a layer3 switch and not a layer 2 switch).


When talking about replacing the T1s with fiber, why eliminating the 7200 ?



HTH, please rate all helpful replies,

Mohammed Mahmoud.

news2010a Sat, 05/05/2007 - 13:32
User Badges:

Thanks Mohammed.

That's was the proposal from one of the engineers. Can you think of any reason why the fiber pipe would make me get rid of the 7200 and connect the fiber device-> copper directly to the 4700 switch? I don't see a correlation there...

Correct Answer
paolo bevilacqua Sat, 05/05/2007 - 14:43
User Badges:
  • Super Gold, 25000 points or more
  • Hall of Fame,

    Founding Member

From a campus design point of view, fiber is associated to switches for reasons of performance. Probably the 4700 can do most what the 7200 does, but if you think you may need more features or a real router for whatever reason, keep the 7200. If you have traffic enough, you will need NPE-G1 or G2 on it.

news2010a Sun, 05/06/2007 - 16:06
User Badges:

How about security? Isn't the current design (fiber->7200 router->Core 4700 switch) considered a significantly more secure design?


By the way, how do you call the servide provider fiber equipment installed by the service provider in the Customer Premises? Is that considered a 'transceiver' or switch perhaps?

Actions

This Discussion