Zafar Ali (zali@cisco) Jean Philippe Vasseur (jpv@cisco) Anca Zamfir (ancaz@cisco)

1. Graceful Shutdown in MPLS Traffic Engineering Networksdraft-ali-ccamp-mpls-graceful-shutdown-03.txt Zafar Ali (zali@cisco.com) Jean Philippe Vasseur (jpv@cisco.com) Anca Zamfir (ancaz@cisco.com) 65th IETF, March 2006

2. History of the Draft • It was first presented at IETF 60 in August 2004. • There is a general agreement on the requirements and the Signaling Solution. • We need to close on a minor detail in the Routing Solution (discussion focus for today). 65th IETF, March 2006

3. Motivation for using the link-attribute sub-TLV • The draft proposes to use link-attribute sub-TLV with “local maintenance required” bit, as defined in http://www.ietf.org/internet-drafts/draft-ietf-isis-link-attr-01.txt. • Draft discusses the possibility of using (MAX-METRIC, Zero Bandwidth) based solution but also points out some issues associated with this solution- • A link may end-up with max metric for multiple reasons and without the link attribute there is no way a node can tell what the reason is, e.g. a restarting node advertises the max matrices [RFC4203 , RFC4205]. • A resource under graceful shutdown can be used as a last resort resource. • The ID states the following backward compatibility note- • "to deal with nodes not compliant with this document (i.e., does not implement link attribute sub-TLV based solution), the node initiating graceful shutdown MAY originate the TE LSA/LSP containing Link TLV with 0 unreserved bandwidth, Traffic Engineering metric set to 0xffffffff, and if the Link is non-PSC then also with 0 as Max LSP Bandwidth.“. 65th IETF, March 2006

4. Next Steps • There is a general agreement on the requirements and signaling solution. • We would like to close on routing solution quickly. • The work is within the Scope of CCAMP. • We would like to request WG to accept this ID as a WG document. 65th IETF, March 2006