Transcript PowerPoint Presentation - requirements for delivering MPLS

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 IETF@Dublin
Major Changes from -00
• Clarified problem statement in Section 3
– Last IETF, Yakov asked a question about the scalability of CTE LSPs
• Added application scenarios for RSVP-TE over NonTE 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 IETF@Dublin
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 IETF@Dublin
RSVP-TE over Non-TE LSP
C-TE LSPs
non-TE LSPs (LDP)
Vrf instances
CE
C
CE
PE
C
PE
P
P
CE
CE
PE
PE
Customer’s or
Customer’s or
another SP’s network
July 2008
Service Provider’s network
72th IETF@Dublin
another SP’s network
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
PE
C-TE LSPs
vrfs
vrf
・・・
C-TE LSPs
vrfs
PE
Limit on the maximum
amount of bandwidth
July 2008
C-TE LSPs
Limit on the total
amount of bandwidth
72th IETF@Dublin
vrfs
C-TE LSPs
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 IETF@Dublin