[api-ip] [lir-wg] Question to a multihomed PA-space connection
Paul Benjes pbenjes at gblx.net
Thu Jul 25 08:29:24 CEST 2002
equal policy routing, no AS required; here's an example of the commands;
8 - I have two providers and two separate ip netblocks .. yours and the
other guys.. How do I route machines using your ip's down your interface,
and machines using the other guys ip's down his interface?
simple
need three things
a way to determine which machine is talking.. -- access list
based on this source address change the default route on the fly --- route
maps
and apply the above solution to the interfaces. -- interface cmds below
! these match the blocks you got from different providers
! notice the ip NETWORK-ADDRESS and inverted MASK (the any is the
destination)
access-list 198 permit ip 208.48.145.0 0.0.0.255 any
access-list 199 permit ip 207.67.174.128 0.0.0.63 any
! these set the policy and the default route on the fly
! these set only the default address if the block is not directly
connected
route-map equal-access permit 10
match ip address 198
set ip default next-hop 204.246.203.113
^^^^^^^^^^^^^^^ far side of 198 block
route-map equal-access permit 20
match ip address 199
set ip default next-hop 204.137.203.153
^^^^^^^^^^^^^^^ far side of 199 block
! these apply the above to the interfaces
! this example applies to two separate interfaces
! individually configured .. if both ip addresses are on the same
! interface using the secondary command.. just apply to that interface
interface E0
ip policy route-map equal-access
!
int e1
ip policy route-map equal-access
On Thu, 25 Jul 2002, [iso-8859-1] "Thoß, Janko" wrote:
> Hello,
>
> I have "little" question (but notice that I'm not a guru in BGP-routing and
> RIPE-problems).
> We want to connect a customer which don't want to register as a new AS. But
> he wants a connect to 2 provivers (different AS's).
> We have tried to get PI-space from RIPE but the automaticly response told us
> the following:
> -------- Quote --------
> 1. Why is PI space required rather than PA space?
>
> - If PI is requested for multi-homing please explain why the
> second provider cannot route PA space as a more specific
> route(with the PA block holder adding a more specific route
> too).
>
> - The same policies apply to PI space as PA. Administrative ease
> and/or routing are not reasons for PI. Please read the information
> about PA/PI from the RIPE Document, IPv4 Address Allocation and
> Assignment Policies in the RIPE NCC Service Region, Sections 5.1.5
> and 5.1.6:
> -------- Unquote --------
>
> Can anyone tell me what is to do for that the second provider is able to
> announce the /24-PA from the first provider (to emulate a multihomed
> connection) or is it only possible to use the second provider for backup
> with the same space?
>
> wait hopefully for tips or hints
>
> regards,
> Janko Thoß
>
> --
> envia.tel GmbH
> Projektmanager
> Leipziger Str. 116 b
> 04425 Taucha
>
> Tel.: +49 (0) 341 / 120 7069
> Fax: +49 (0) 341 / 120 7052
> Mobil: +49 (0) 173 / 379 0048
> eMail: janko.thoss at envia-tel.de
> Web: http://www.envia-tel.de
>
---------------------------------------------
Paul J. Benjes, CCNP
Director of IP Engineering - API
GlobalCrossing, Inc
pbenjes at gblx.net
602.357.6454 Desk
602.357.6493 FAX
"Do or do not, there is no try." - Yoda
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