[c-nsp] Customers routers

[Jon Lewis]

On Sat, 4 Sep 2010, Mohammad Khalil wrote:

> we use OSPF to transport customers routers into our backbone , i read in 
> one of Cisco presentations that its best to use BGP for the same purpose

One reason not to use OSPF is control.  By customers routers, I assume you 
mean CPE which you maintain/admin.  If you use OSPF and a smart customer 
does password-recovery and breaks into their router and makes changes, 
they can inject routes into your network.  OSPF has very little in the way 
of route filtering.  With BGP, you would have a prefix filter on your end 
of the session that prevents CPE from injecting unexpected routes into 
your network.  With BGP, it's also much easier to control which routes get 
advertised to each CPE.  They probably only need a default route in most 
cases.

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  Jon Lewis, MCP :)           |  I route
  Senior Network Engineer     |  therefore you are
  Atlantic Net                |
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