Transcript ccamp-8

Routing extensions for discovery of
TE Node Capabilities
draft-vasseur-ccamp-te-node-cap-00.txt
Jean-Philippe Vasseur (Cisco)
Jean-Louis Le Roux (France Telecom)
Peter Psenak (Cisco)
Stefano Previdi (Cisco)
Seisho Yasukawa (NTT)
Paul Mabey (Qwest)
IETF 62, Minneapolis 03/08/2005
History
 Initially three drafts
A functional spec defining routing extensions for the advertisement of TE
node information
– TE Mesh group, TE node cap & PCE capabilities
An ISIS encoding spec
An OSPF encoding spec
 These drafts were mixing pretty distinct functions
 Better to have each function in a separate draft, specifying both
ISIS and OSPF encoding and procedures
=>Two new drafts:
draft-vasseur-ccamp-te-node-cap-00.txt
draft-vasseur-ccamp-auto-mesh-00.txt
 Note: PCE discovery will be addressed in the PCE WG
Content Overview
This draft defines ISIS and OSPF extensions for
the advertisement of TE node capabilities
Data plane node capabilities (e.g. P2MP Branch LSR)
Control plane capabilities (e.g. P2MP Signaling)
To be used as constraints during TE-LSP path
computation
To avoid nodes that do not support a given TE
capability either in the control or data plane
Or to trigger procedure to handle such nodes
(backward compatibility)
The TE Node Capability Descriptor TLV
 TE Node Capability Descriptor TLV
DATA-PLANE-CAP sub-TLV
 CONTROL-PLANE-CAP sub-TLV
 To be carried
Within the OSPF Router Information LSA
Within the ISIS CAPABILITY TLV
 Set of bit flags, where each bit represents a node capability
 Several TE node capabilities currently defined
Two Data plane capabilities : P2MP Branch LSR, P2MP Bud LSR
Three Control plane capabilities : 3209 support, 3473 support ,P2MP Signaling
 Extensible encoding => New capabilities could be defined in the future
Next steps
 Facilitate path computation within a network that contains LSRs
with distinct capabilities
Particularly required for P2MP MPLS Tree computation
 Ligth extensions
 Static information, no impact neither on IGP scalability nor on
IP routing
 Will have to be reviewed by OSPF and ISIS WGs
 Adopt as a WG document?