

hence the emails from Peter (Redback) & Bill (Juniper)). =20

The extra complexity with the CPE has always been my biggest concern,
and is why I entered the thread many weeks ago.

Eric=20

> From: Ralph Droms, November 07, 2007 7:06 AM
>=20
> Eric - I was mostly responding to Ric's description of the=20
> excessive load on DHCP servers in the short-lease/long-lease=20
> scenario.  As I understand the short-lease/long-lease=20
> scenario, if we assume that authentication takes place in the=20
> short-lease window, the load on the DHCP servers would=20
> double.  Significant, sure, but not game-changing in the way=20
> Ric implied.
>=20
> - Ralph
>=20
> On Nov 6, 2007, at Nov 6, 2007,10:39 PM, Eric Voit (evoit) wrote:
>=20
> >> From: Ralph Droms, November 05, 2007 9:37 PM
> >>
> >> Does the short lease/long lease scenario scale the DHCP=20
> server load=20
> >> by more than a factor of two?
> >
> > Ralph,
> >
> > The messages the DHCP servers will double.
> > The messages with L3 edge (BRAS) will more than double.
> > The messages with the CPE will more than triple.
> >
> > (Below is some rough math. I might have missed a message or=20
> two, but=20
> > the general trend is what I am trying to show.)
> >
> > -----------------------------------------
> > CPE Messages
> > -----------------------------------------
> > DHCP Auth, assuming a 2 message EAP Method, the messages=20
> used by EAP=20
> > would be equal
> > + 6 Messages (draft-pruss-dhcp-auth-dsl-01)
> >
> > PANA+DHCP Method
> > + 4 Messages: DHCP 1st IP address
> > ~ (+2) DHCP renews per 60 seconds until authenticated
> > + 11 Messages PANA with BRAS (draft-ietf-pana-pana-18, section 4.1)
> > + 4 Messages: DHCP 2nd IP address
> >
> > -----------------------------------------
> > L3 Edge (BRAS) Messages
> > -----------------------------------------
> > DHCP Auth, EAP Method
> > + 8 Messages (draft-pruss-dhcp-auth-dsl-01)
> >
> > PANA Method
> > + 4 Messages: DHCP 1st IP address
> > ~ (+2) DHCP renews per 60 seconds until authenticated
> > + 11 Messages PANA with CPE (draft-ietf-pana-pana-18, section 4.1)
> > + 2 messages min for validating with EAP Server
> > + 4 Messages: DHCP 2nd IP address
> >
> > -----------------------------------------
> > L2 Edge (DSLAM or Access Switch) Messages
> > -----------------------------------------
> > DHCP Auth, EAP Method
> > + 6 Messages snooped (draft-pruss-dhcp-auth-dsl-01)
> >
> > PANA+DHCP Method
> > + 4 Messages Snooped: DHCP 1st IP address
> > ~ (+2) DHCP renews per 60 seconds until authenticated If=20
> snooping: 11=20
> > Messages PANA (draft-ietf-pana-pana-18, section 4.1) Else=20
> if explicit=20
> > policy distribution like ANCP, ~4 messages (one policy per address)
> > + 4 Messages Snooped: DHCP 2nd IP address
> >
> >
> > Eric
> >
> >
> >> - Ralph
> >>
>=20
>=20
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>=20

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