1. Requirements for supporting Customer RSVP and RSVP-TE over a BGP/MPLS IP-VPN draft-ietf-l3vpn-e2e-rsvp-te-reqts-01.txt
Kenji Kumaki KDDI R&D Labs, Editor
Raymond Zhang BT
Yuji Kamite NTT Communications
July 2008
72th

2. Major Changes from -00 Clarified problem statement in Section 3
Last IETF, Yakov asked a question about the scalability of C-TE LSPs
Added application scenarios for RSVP-TE over Non-TE LSP in section 5.6
Added specific requirements for admission control support for C-TE LSPs in LDP-based core networks in section 6.6
July 2008
72th

3. Problem Statement
C-TE LSP model (data packets among CEs are forwarded by "labeled IP packets ")
If service providers offer a C-TE LSP from CE to CE over BGP/MPLS VPNs, they require that a MPLS TE LSP from a local CE to a remote CE be established. However, if a C-TE LSP signaling is to send within VPN, the service provider network will face scalability issues.
A C-TE LSP can be aggregated by a P-TE LSP at PE. (i.e. hierarchical LSPs) In this case, only PEs maintain state about customer RSVP sessions.
A C-TE LSP can not be aggregated by a P-TE LSP at PE depending on some policies. (i.e. continuous LSPs) In this case, both Ps and PEs maintain state about customer RSVP sessions.
A C-TE LSP can be aggregated by non-TE LSP (i.e. LDP). In this case, only PEs maintain state about customer RSVP sessions. Note that there is always enough bandwidth available in service provider core network.
July 2008
72th

4. RSVP-TE over Non-TE LSP
C-TE LSPs
non-TE LSPs (LDP)
Vrf instances CE PE C C CE PE P P CE CE PE PE
Customer’s or
another SP’s network
Customer’s or
another SP’s network
Service Provider’s network
July 2008
72th

5. Specific Requirements
Admission Control Support for C-TE LSPs in LDP-based Core Networks
PEs MUST have a configurable limit on the maximum amount of bandwidth that can be reserved by C-TE LSPs per a vrf instance (i.e. per a customer). Also, a PE SHOULD have a configurable limit on the total amount of bandwidth that can be reserved by C-TE LSPs between PEs. PE PE
C-TE LSPs PE
vrfs
C-TE LSPs
C-TE LSPs
vrfs
・・・
vrf PE
C-TE LSPs
Limit on the total amount of bandwidth
Limit on the maximum amount of bandwidth
vrfs
July 2008
72th

6. Next Steps Will add application scenarios based on comments
Stitching LSPs
CE-PE: C-TE LSPs
PE-PE: non-TE LSPs (LDP)
PE-CE: C-TE LSPs
July 2008
72th