[c-nsp] OSPF areas?

[Bruce Pinsky]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Vincent De Keyzer wrote:
> Steinar,
> 
>> Customer routes in iBGP, backbone links in IGP is *very* common in
>> service provider environments.
> 
> The idea of having no customer routes in OSPF, and having all customer
> routes in BGP (both BGP and non-BGP customer routes) is quite attractive.
> 
> Are there any other advantages of doing so ?
> 

- - Keeps your customers from being able to reach your infrastructure (i.e.
better security)

- - Keeps your LS database lean and mean so you can consider Fast Convergence

- - Allows you to do area-border filtering so that you can consider leaking
only /32 peering addresses between areas

- - If you have an MPLS/VPN environment, allows you to put connected
interfaces into a management VRF so that you need not leak connecteds (or
summary routes for connecteds) if you need direct reachability to interfaces

- - Gives you (and you customers) better administrative controls and tools
for influencing routing

- - Allows you to more easily create a remotely triggered blackholing
capability

- - Simply scales better since BGP is designed (essentially) for bulk data
transfer

to name a few...

- --
=========
bep

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.2.2 (MingW32)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iD8DBQFEKsgXE1XcgMgrtyYRAv1gAKD6b7+ZbsrHoF/c88QjzMUuQhuWXACffaZ6
eCIhq3u5WvVgVi6C1qzyI+8=
=Ugyq
-----END PGP SIGNATURE-----