BGP partial routes
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Posted by linguafr on August 26, 2008, 4:45 pm
Please log in for more thread options We are preparing new hw that will allow us to receive bgp routes =96 currently we=92re just broadcasting. However, we know that our supervisor 32 engine does not have the capability to receive the entire internet routing table. One approach I=92m familiar with is only receiving routes for peers directly connected to the provider. Can you verify if this is a correct approach for example, w/ internap? ip as-path access-list 100 permit ^12182_[0-9]* (sj) ip as-path access-list 100 permit ^13789_[0-9]* (ny) route-map inap-announce-in permit 10 match as-path 100 =2E..if we're peered with 3 tier 1 isps, how many routes might we expect to receive? | |||||||||||||
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Posted by Merv on August 27, 2008, 3:55 am
Please log in for more thread options try ^12182_?[0-9]*$ remember to entering Ctrl-V before entering the ? | |||||||||||||
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Posted by Merv on August 27, 2008, 9:36 am
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>
> > > > We are preparing new hw that will allow us to receive bgp routes =96
> > currently we=92re just broadcasting. > > However, we know that our supervisor 32 engine does not have the > > capability to receive the entire internet routing table. > > One approach I=92m familiar with is only receiving routes for peers > > directly connected to the provider. >
> > Can you verify if this is a correct approach for example, w/ internap?
>
> > ip as-path access-list 100 permit ^12182_[0-9]* (sj)
> > ip as-path access-list 100 permit ^13789_[0-9]* (ny) >
> > route-map inap-announce-in permit 10
> > =A0match as-path 100 >
> > ...if we're peered with 3 tier 1 isps, how many routes might we expect
> > to receive? >
> try > > =A0^12182_?[0-9]*$ > > remember to entering Ctrl-V before entering the ? OBTW you should requet that your ISP only advertise partials to you so that you router does not hav to filter full routes - leave the as path filters for partials in place though Also make sure to filter for you own networks in the inbound filters to protect your network | |||||||||||||
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Posted by linguafr on August 27, 2008, 2:33 pm
Please log in for more thread options
>
> > > > > > We are preparing new hw that will allow us to receive bgp routes =96
> > > currently we=92re just broadcasting. > > > However, we know that our supervisor 32 engine does not have the > > > capability to receive the entire internet routing table. > > > One approach I=92m familiar with is only receiving routes for peers > > > directly connected to the provider. >
> > > Can you verify if this is a correct approach for example, w/ internap=
?
>
> > > ip as-path access-list 100 permit ^12182_[0-9]* (sj)
> > > ip as-path access-list 100 permit ^13789_[0-9]* (ny) >
> > > route-map inap-announce-in permit 10
> > > match as-path 100 >
> > > ...if we're peered with 3 tier 1 isps, how many routes might we expec=
t
> > > to receive?
>
> > try
>
> > ^12182_?[0-9]*$
>
> > remember to entering Ctrl-V before entering the ?
>
> OBTW you should requet that your ISP only advertise partials to you so > that you router does not hav to filter full routes - leave the as > path filters for partials in place though > > Also make sure to filter for you own networks in the inbound filters > to protect your network Why '?' in the as-path acl? Good pt about filtering out our networks. I guess just ip as-path access-list 101 deny *<our AS>* would work, no?
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Posted by Merv on August 28, 2008, 10:12 am
Please log in for more thread options
>
> > > > > > > > > > We are preparing new hw that will allow us to receive bgp routes =
=96
> > > > currently we=92re just broadcasting.
> > > > However, we know that our supervisor 32 engine does not have the > > > > capability to receive the entire internet routing table. > > > > One approach I=92m familiar with is only receiving routes for peers > > > > directly connected to the provider. >
> > > > Can you verify if this is a correct approach for example, w/ intern=
ap?
>
> > > > ip as-path access-list 100 permit ^12182_[0-9]* (sj)
> > > > ip as-path access-list 100 permit ^13789_[0-9]* (ny) >
> > > > route-map inap-announce-in permit 10
> > > > =A0match as-path 100 >
> > > > ...if we're peered with 3 tier 1 isps, how many routes might we exp=
ect
> > > > to receive?
>
> > > try
>
> > > =A0^12182_?[0-9]*$
>
> > > remember to entering Ctrl-V before entering the ?
>
> > OBTW you should requet that your ISP only advertise partials to you so
> > that you router does not hav to filter full routes =A0- leave the as > > path filters for partials in place though >
> > Also make sure to filter for you own networks in the inbound filters
> > to protect your network >
d text -
> Why '?' in the as-path acl? > Good pt about filtering out our networks. =A0I guess just > ip as-path access-list 101 deny =A0*<our AS>* would work, no?- Hide quote= >
> - Show quoted text - You should have an inbound filter to block your network assigned blocks; not by AS. | |||||||||||||
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> currently we=92re just broadcasting.
> However, we know that our supervisor 32 engine does not have the
> capability to receive the entire internet routing table.
> One approach I=92m familiar with is only receiving routes for peers
> directly connected to the provider.
>
> Can you verify if this is a correct approach for example, w/ internap?
>
> ip as-path access-list 100 permit ^12182_[0-9]* (sj)
> ip as-path access-list 100 permit ^13789_[0-9]* (ny)
>
> route-map inap-announce-in permit 10
> =A0match as-path 100
>
> ...if we're peered with 3 tier 1 isps, how many routes might we expect
> to receive?