No, you really don't.

If people are downloading stuff to you 99% of time, then you really DO NOT need
full routes at all. Just get a default route

What you can do is get a default route from a transit, and get partial routes
from the other, or tell them to send you full routes but use as-path filters
to filter out ASes that are adj. to that transit, etc.. There are many ways you
can poke around with this :)

Remember: Default route _is_ full route :-)

-hc

-- 
Sincerely,
  Haesu C.
  TowardEX Technologies, Inc.
  WWW: http://www.towardex.com
  E-mail: haesu@...
  Cell: (978) 394-2867

On Thu, Jul 31, 2003 at 08:43:13AM -0700, Anthony Guida wrote:
> Hello,
> 
> I work for a smaller ISP in Chicago and we are running
> a multi-homed BGP environment with 2 backbone
> providers. Our edge router is a 7206VXR (NPE300) with
> 256MB of RAM. We have 6 T1s plugged into this router,
> 3 to each backbone provider. We are also currently
> taking full BGP feeds from both providers.
> 
> I have been noticing somewhat of an increase in CPU
> and memory usage on the edge router in the past few
> months and would like to get some assistance on
> whether or not we should be taking full BGP feeds
> since I understand this takes up a lot of CPU and
> memory. Another reason for this performance/latency
> throughout our network.
> 
> According to our MRTG graphs, I can say 99 percent of
> our traffic is inbound. Since we are an ISP, everyone
> is downloading images and files more than uploading
> like a web hosting provider would. What I mean is
> taking full BGP feeds for outbound traffic really
> shouldn't matter. We should just take partial or
> default routes and let our backbone providers decide
> where to send the outbound traffic. Our inbound
> traffic is determined through our AS prepending &
> advertisements config.
> 
> I would like to know what is recommended. Should we be
> accepting full BGP feeds and deal with the CPU & Mem
> usage? Or should we be taking only partial with a
> default?
> What is best practice or what are other network
> engineers doing with similar environments?
> 
> Any information is greatly appreciated.
> 
> Thanks,
> Anthony
> 
> 
> 
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> ------------------------ANNOUNCEMENT---------------------------------
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>            ISPCON FALL 2003 - Santa Clara Convention Center
>      October 20-22 - The Definitive Event Wired and Wireless ISPs
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> 






------------------------ANNOUNCEMENT---------------------------------
---------------------------------------------------------------------
           ISPCON FALL 2003 - Santa Clara Convention Center
     October 20-22 - The Definitive Event Wired and Wireless ISPs
                            www.ispcon.com
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Replies

[isp-bgp] Smaller ISP, do we need full BGP routes?, Anthony Guida