Leaf discovery mechanism for mLDP based P2MP/MP2MP LSP

draft-jin-mpls-mldp-leaf-discovery-01

Lizhong Jin, ZTEKebo Liu, Nokia Siemens Networks

Version 00 vs 01

• Thank for additional comments from – Rahul Aggarwal, Dimitri Papadimitriou, Freder

ic Jounay and Simon DeLord

• Add a new leaf discovery mechanism based on MP-BGP.

MP-BGP leaf discovery - mLDP leaf NLRI

+-------------------------------------------+ | mLDP MP FEC Element Length (1 octet) | +-------------------------------------------+ | mLDP MP FEC Element (Variable) | +-------------------------------------------+ | Leaf Node Address Length (1 octet) | +-------------------------------------------+ | Leaf Node Address (Variable) | +-------------------------------------------+

• Defines a new BGP NLRI, called mLDP leaf NLRI.• The mLDP leaf NLRI is advertised in BGP UPDATE mes

sages.• The [AFI, SAFI] value pair used to identify this NLRI

– AFI for MPLS Multicast, pending, IANA allocation– SAFI for mLDP leaf discovery, pending IANA allocation

MP-BGP leaf discovery - Node operation

• When the leaf node is triggered to join one P2MP/MP2MP LSP – The leaf node sends BGP UPDATE message

s with MP_REACH_NLRI to its root node

• When the leaf node is triggered to leave one P2MP/MP2MP LSP – The leaf node sends BGP UPDATE message

s with MP_UNREACH_NLRI to its root node

Leaf discovery & application

• Leaf discovery depends on application.

• Generally, – Application with LDP signaling, may use leaf d

iscovery mechanism based on T-LDP.– Application with MP-BGP signaling, may use l

eaf discovery mechanism based on MP-BGP.

Leaf discovery & application

Application Leaf discovery mechanism

LDP based P2MP PW (single segment P2MP PW)[I-D. draft-martini-pwe3-p2mp-pw]

T-LDP based Leaf discovery

MP-BGP based P2MP PW[I-D. draft-raggarwa-l2vpn-p2mp-pw-02]

MP-BGP based Leaf discovery

MP-BGP based Multicast VPLS[I-D. draft-ietf-l2vpn-vpls-mcast-05]

MP-BGP based Leaf discovery

MP-BGP based Multicast L3VPN[I-D. draft-ietf-l3vpn-2547bis-mcast-09]

MP-BGP based Leaf discovery

Next steps

• Need comments from work group

Thank you