Subject: Re: [Softwires] BGP TE attr last call by softwires WG (2nd question)

From: "Drake, John E" <[email-masked]>
Date: Fri, 29 Aug 2008 11:31:36 -0700

So you are proposing an OSPF route reflector?  At what point does the
silliness stop? 

>-----Original Message-----
>From: Igor Bryskin [mailto:[email-masked]] 
>Sent: Friday, August 29, 2008 11:29 AM
>To: Drake, John E; Yakov Rekhter; Lou Berger
>Cc: Yakov Rekhter; Adrian Farrel; [email-masked]; 
>[email-masked]
>Subject: Re: [Softwires] BGP TE attr last call by softwires WG 
>(2nd question)
>
>Hi John,
>
>No, not really. When you add a PE you configure local 
>interfaces, local VPN port mappings, stuff like that. While 
>doing this you will also configure an IPinIP tunnel to one of 
>your spoke Ps and enable L1VPN OSPF instance on the tunnel. 
>Once you did that the local VPN information will be flooded 
>accross the overlay, likewise, the new PE will get all the 
>necessary information from other PEs.
>
>Cheers,
>Igor
>
>
>----- Original Message ----
>From: "Drake, John E" <[email-masked]>
>To: Igor Bryskin <[email-masked]>; Yakov Rekhter 
><[email-masked]>; Lou Berger <[email-masked]>
>Cc: Yakov Rekhter <[email-masked]>; Adrian Farrel 
><[email-masked]>; [email-masked]; [email-masked]
>Sent: Friday, August 29, 2008 11:20:16 AM
>Subject: RE: [Softwires] BGP TE attr last call by softwires WG 
>(2nd question)
>
>Igor,
>
>Doesn't this defeat auto-discovery?  I.e., how is a new PE 
>added to a given L1VPN?
>
>Thanks,
>
>John 
>
>>-----Original Message-----
>>From: Igor Bryskin [mailto:[email-masked]]
>>Sent: Friday, August 29, 2008 5:51 AM
>>To: Yakov Rekhter; Lou Berger
>>Cc: Yakov Rekhter; Adrian Farrel; [email-masked]; 
>>[email-masked]
>>Subject: Re: [Softwires] BGP TE attr last call by softwires WG (2nd 
>>question)
>>
>>Yakov,
>>
>>You said:
>>
>>
>>... And while on the subject of scaling, please keep in mind that BGP 
>>only stores L1VPN routes on PEs that have sites of that VPN connected 
>>to them, and on an RR if used, but *not* on any of the P routers. In 
>>contrast, rfc5252 (OSPF for L1VPN
>>autodiscovery) results in storing *all VPN TE information for all the 
>>VPNs* on *all* the IGP nodes, both P and PE. So, clearly BGP-based 
>>approach scales better than OSPF-based approach.
>>
>>Yakov.
>>
>>This is not true in case of multi-instance OSPF: one can build an 
>>overlay interconnecting PEs via one or small number of Ps 
>using IPinIP 
>>tunnels and run in this overlay an instance of OSPF specifically 
>>designated for distribution of L1VPN information. In this 
>case the OSPF 
>>solution won't scale any worse than the BGP approach. Note. 
>that rfc252 
>>never said that the instance of OSPF used for flooding of the L1VPN 
>>information must be the same instance that is used for the 
>distribution 
>>of IP-related LSAs.
>>
>>Regards,
>>Igor
>>
>>
>>
>>
>
>
>
>
_______________________________________________
Softwires mailing list
[email-masked]
https://www.ietf.org/mailman/listinfo/softwires