Hi Ralph, Doubling the load on the DHCP servers probably will not change the game.
The extra load on the L3 Edge/BRAS could easily change the game (and hence the emails from Peter (Redback) & Bill (Juniper)). The extra complexity with the CPE has always been my biggest concern, and is why I entered the thread many weeks ago. Eric > From: Ralph Droms, November 07, 2007 7:06 AM > > Eric - I was mostly responding to Ric's description of the > excessive load on DHCP servers in the short-lease/long-lease > scenario. As I understand the short-lease/long-lease > scenario, if we assume that authentication takes place in the > short-lease window, the load on the DHCP servers would > double. Significant, sure, but not game-changing in the way > Ric implied. > > - Ralph > > On Nov 6, 2007, at Nov 6, 2007,10:39 PM, Eric Voit (evoit) wrote: > > >> From: Ralph Droms, November 05, 2007 9:37 PM > >> > >> Does the short lease/long lease scenario scale the DHCP > server load > >> 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 > two, but > > the general trend is what I am trying to show.) > > > > ----------------------------------------- > > CPE Messages > > ----------------------------------------- > > DHCP Auth, assuming a 2 message EAP Method, the messages > used by EAP > > 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 > snooping: 11 > > Messages PANA (draft-ietf-pana-pana-18, section 4.1) Else > if explicit > > policy distribution like ANCP, ~4 messages (one policy per address) > > + 4 Messages Snooped: DHCP 2nd IP address > > > > > > Eric > > > > > >> - Ralph > >> > > > _______________________________________________ > Int-area mailing list > [email protected] > https://www1.ietf.org/mailman/listinfo/int-area > _______________________________________________ Int-area mailing list [email protected] https://www1.ietf.org/mailman/listinfo/int-area
