From: Anthony Pace (anthonypace@fastmail.fm)
Date: Tue May 25 2004 - 12:13:42 GMT-3
I saw this thread and would like to relate a real life experience I had
with BGP load balancing and get some feedback. I have tried the
following:
- Announce address space out of 1 provider and send EGRESS traffic out
the other. (Allot of people said this was asymmetrical routing but the
LAN was downstream of both routers doing this so it was quite symmetrical
by the time it came down into the firewall.)(this was true load balancing
and I am inclined to think that people who were critical of it were,
perhaps, just regurgitating something they heard someone else say)
- Announce some address space via one provider and some address space via
the other. Use policy routing to control the EGRESS traffic. (use
prepends and Local preference to influence the traffic while allowing
full redundancy)
- take in full routes from 2 providers on 2 routers and also peer them
with each other. Let the traffic come and go however it wants to.
- take in partial routes + default route form 2 providers. Let the
traffic come and go however it wants to.
Anthony Pace CCIE 10349
On Thu, 22 Apr 2004 10:00:05 -0500, "Kaiser Anwar"
<kaiseranwar@sbcglobal.net> said:
> Ok, that makes sense. Now with two links to two different isp's , I would
> want to advertise only my network to isp's and get only my isp's routes.
> I
> guess I will need to still have static default route to my isp's. I hope
> I
> am making sense. Thanks
>
> Kaiser Anwar
> Network Engineer
> Cell: (847) 409-7261
>
>
> -----Original Message-----
> From: Jim Devane [mailto:jim@powerpulse.cc]
> Sent: Wednesday, April 21, 2004 10:11 PM
> To: 'Kaiser Anwar'; groupstudy@cconlinelabs.com; 'Ccielab@Groupstudy.
> Com
> (E-mail)'
> Subject: RE: BGP load balancing with two isp's
>
> Hmmm, getting the whole table and becoming transit are definitely not
> linked.
>
> I get several full tables from upstreams but I am certainly not transit
> for
> the upstreams. That is, I get routes from UUNet but I only announce my
> OWN
> routes to the upstreams. I think, even with our OC-12's that UUNet,
> Broadwing, et. al would be VERY concerned about me advertising a full
> table
> to them ( and thusly becoming transit )
>
> I like to get at least 3 full tables for that if any one ( or heaven
> help
> me ) 2 links go down I still have "internet" routes and a back up. I also
> like to get a couple "customer" routes from other providers (for
> performance
> and to lower my transit costs ( although paid peering isn't drastically
> cheaper these days )
>
>
> As far as why you would want to become transit, I am not sure that
> happens
> as much these days. In the days of the traditional NAPS/MAEs it was more
> likely but with the proliferation of IX's there just isn't that strong a
> case for it.
>
> I hope I am understanding your question correctly.
>
> HTH,
> Jim
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Kaiser Anwar
> Sent: Wednesday, April 21, 2004 7:22 PM
> To: groupstudy@cconlinelabs.com; 'Ccielab@Groupstudy. Com (E-mail)'
> Subject: RE: BGP load balancing with two isp's
>
> I will definitely read the book. But just wondering under what
> circumstances would want to get the whole routing table or become transit
> AS. Thanks
>
>
> Kaiser Anwar
> Network Engineer
> Cell: (847) 409-7261
>
>
> -----Original Message-----
> From: Tony Schaffran [mailto:groupstudy@cconlinelabs.com]
> Sent: Wednesday, April 21, 2004 8:51 PM
> To: 'Kaiser Anwar'; 'Ccielab@Groupstudy. Com (E-mail)'
> Subject: RE: BGP load balancing with two isp's
>
> You do not have to become an IP transit. You choose what routes you
> receive
> from and advertise to the other AS's.
>
> Tony Schaffran
> Network Analyst
> CCIE #11071
> CCNP, CCNA, CCDA,
> NNCDS, NNCSS, CNE, MCSE
>
> www.cconlinelabs.com
> Your #1 choice for online Cisco rack rentals.
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Kaiser Anwar
> Sent: Wednesday, April 21, 2004 6:41 PM
> To: Ccielab@Groupstudy. Com (E-mail)
> Subject: BGP load balancing with two isp's
>
> Hi,
> I was wondering that what is best using bgp to do load sharing or static
> routes. Also when using BGP why some one would to have all the internet
> routes an become transit AS. Thanks in advance for help.
>
> Kaiser Anwar
> Network Engineer
> Cell: (847) 409-7261
>
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-- Anthony Pace anthonypace@fastmail.fm-- http://www.fastmail.fm - Or how I learned to stop worrying and love email again
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