[Re: FW: [nsp] BGP with 3 diff provider.....]

[Joshua Smith]

access-list 5 permit xxx.xxx.xxx.xxx    #isp A address block
access-list 10 permit yyy.yyy.yyy.yyy   #isp B address block
access-list 15 permit zzz.zzz.zzz.zzz   #isp C address block

route-map FOR_ISP_A permit 10
match ip address 10
set as-path B

route-map FOR_ISP_A permit 20
match ip address 15
set as-path C C

and so on - but like jeff said, this will only work if you get a
unique netblock from each provider.  if there are overlaps, or
they all share the same address space, you could try policy-routing
on each inbound interface (similar idea)

"Tejal Shah" <tejal.shah at in.iqara.net> wrote:
> But for this how to play with route-maps or prefix list.
> I tried but its not working.
> 
> Tejal
> 
> ----- Original Message -----
> From: "Jeff Groth" <jeff at groth.com>
> Date: Sunday, February 2, 2003 3:11 am
> Subject: FW: [nsp] BGP with 3 diff provider.....
> 
> > oops
> > 
> > 
> > > 
> > > 
> > > Prepending? This is assuming provider independent 
> > netblocks.> 
> > > IP Block A:
> > >  to ISP A - not prepended
> > >  to ISP B - prepended once
> > >  to ISP C - prepended twice
> > > 
> > > IP Block B:
> > >  to ISP B - not prepended
> > >  to ISP C - prepended once
> > >  to ISP A - prepended twice
> > > 
> > > IP Block C:
> > >  to ISP C - not prepended
> > >  to ISP A - prepended once
> > >  to ISP B - prepended twice
> > > 
> > > 
> > > Jeff
> > > 
> > > 
> > > > -----Original Message-----
> > > > From: cisco-nsp-bounces at puck.nether.net 
> > > > [mailto:cisco-nsp-bounces at puck.nether.net] On 
> > Behalf Of 
> > > Network 4 all
> > > > Sent: Saturday, February 01, 2003 3:28 PM
> > > > To: NSP
> > > > Subject: [nsp] BGP with 3 diff provider.....
> > > > 
> > > > 
> > > > Hello All,
> > > > 
> > > >            I want to start BGP session with 3 diff.
> > > > provider.I m already running with 2 Provider.
> > > > 
> > > >  I have 3 IP block which needs to be annouced as
> > > > mention below for load-balancing.
> > > > 
> > > > IP block A --
> > > >  All traffic for this block should return via ISP A,
> > > > if ISP A fail it should come via ISP B and if ISP B
> > > > fail it shold come vi ISP C.
> > > > 
> > > > IP block B ---
> > > >  All traffic for this block should return via ISP B,
> > > > if ISP B a fail it should come via ISP C and if 
> > ISP C
> > > > fail it shold come vi ISP A.
> > > > 
> > > > 
> > > > IP block C --
> > > > 
> > > >  All traffic for this block should return via ISP C,
> > > > if ISP a fail it should come via ISP A and if ISP A
> > > > fail it shold come vi ISP B.
> > > > 
> > > > 
> > > > with regards
> > > > Tejal
> > > > 
> > > > 
> > 
> ____________________________________________________________
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> > > > 
> > > 
> > 
> > 
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> 
> 
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> 
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