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Multihome network and Autonomous System router wth BGP

Posted on 2010-08-27
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Last Modified: 2012-05-10
Hi EE

Am looking for advice on best practices so i can configure a juniper ssg 550M as the main router for a startup ISP.

The upstream provider is operating under the ASN: <hidden>  and will advertise there block to us which is x.x.224.0/19   and we will advertise our assigned block (from AFrinic) which is x.x.160.0/22

from the documentation ive been reading, it looks like i will need to use BGP to accomplish this, which in itself seems very simple to setup.

My question is how with the juniper do i then provision segments of our assigned ips to client networks and equipment? The startup was thinking something along the lines of

-  /24 - Client network  )
- /24 - Wireless network
- /24  NOC-DSL network  

which seems simple enough, except if i want some clients modems to get dhcp from the client subnet, and other clients modems to have a block of 4 or 8 static ips that they can configure on their own equipment.

It has been suggested in another forum that i set each client into their own vlan and trunk these to the SSG550.  Then assign each vlan their corresponding cidr block and put the default gateway ip on the SSG550. Does this make sense or is it a long shot?

Since this is all new to me, i may be missing some key points. Please let me know if more clarification is required.

Thanks EE
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Question by:Sanga Collins
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>The upstream provider is operating under the ASN: <hidden>  and will advertise there block to us which is x.x.224.0/19   and we will advertise our assigned block (from AFrinic) which is x.x.160.0/22

Typical setup

>from the documentation ive been reading, it looks like i will need to use BGP to accomplish this, which in itself seems very simple to setup.

For the most part, I am assuming you have your own public ASN and that you are multi-homed (to at least 2 providers)? WIthout getting involved in any traffic engineering, the setup is fairly simple, even with one connection to an ISP (Something I would not recommend, but this might be all that you have to work with at this time).

>My question is how with the juniper do i then provision segments of our assigned ips to client networks and equipment? The startup was thinking something along the lines of


The idea is to build the network to be scalale; typically SP environments will have:

Border Router
Core routers (Possibly as route reflectors [BGP Term]
Agg switches
DSL Aggregation - Dialup - Wireless (Typical customer services)

Some helpful links:

http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a00801c2aa9.shtml
http://ws.edu.isoc.org/workshops/2005/SANOG-VI/routing/materials/a3-6up.pdf

There are many design scenarios, depending on your business plan/model, you need to take this into consideration (Do not go cheap, it will be more of a headache later on down the road). the goal is to design a predictable, scalable, and cost-effective network.

You state that you are a startup ISP; do you have a network design/topology already on a network map? What are your assets in the network? Do you plan to terminate all your customers on the 550?

If you can bring more details to the table, I am sure that we could possible assist you much better as there can be many design scenarios.

Billy
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by:Sanga Collins
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It took me a while to take the Cisco lingo and translate it to the juniper way of doing things, but i was able to gather enough info from your links to succesfully get this setup. Intial testing went well now just need to optimize and scale for our entire range.

Thanks!
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