draft-ietf-ccamp-tracereq-04.txt   draft-ietf-ccamp-tracereq-05.txt 
Internet Draft R. Bonica Internet Draft R. Bonica
Category: Informational MCI Category: Informational MCI
Expiration Date: December 2003 K. Kompella Expiration Date: December 2003 K. Kompella
Juniper Networks Juniper Networks
D. Meyer D. Meyer
Sprint Sprint
June 2003 June 2003
Tracing Requirements for Generic Tunnels Tracing Requirements for Generic Tunnels
draft-ietf-ccamp-tracereq-04 draft-ietf-ccamp-tracereq-05
Status of this Memo Status of this Memo
This document is an Internet-Draft and is in full conformance with This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC-2026. all provisions of Section 10 of RFC-2026.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet- other groups may also distribute working documents as Internet-
Drafts. Internet-Drafts are draft documents valid for a maximum of Drafts. Internet-Drafts are draft documents valid for a maximum of
skipping to change at line 273 skipping to change at line 273
must use a separate probe to elicit each response because the must use a separate probe to elicit each response because the
alternative approach, using the single probe with the IP Router Alert alternative approach, using the single probe with the IP Router Alert
Option, is unacceptable. Many networks forward datagrams that specify Option, is unacceptable. Many networks forward datagrams that specify
IP options differently than they would forward datagrams that do not IP options differently than they would forward datagrams that do not
specify IP options. Therefore, the introductions of IP options would specify IP options. Therefore, the introductions of IP options would
cause the application to trace a forwarding path other than the path cause the application to trace a forwarding path other than the path
that its user intended to trace. that its user intended to trace.
4.2. Transport Layer Requirements 4.2. Transport Layer Requirements
UDP carries all protocol messages to their destinations. UDP should carry all protocol messages to their destinations. Other
transport mechanisms may be considered as the protocol is specified.
Justification: Because the probe/response scheme described above is Justification: Because the probe/response scheme described above is
stateless, a stateless transport is required. Candidate transports stateless, a stateless transport is required. Candidate transports
included UDP over IP, IP and ICMP. ICMP was disqualified because included UDP over IP, IP and ICMP. ICMP was disqualified because
carrying MPLS information in an ICMP datagram would constitute a carrying MPLS information in an ICMP datagram would constitute a
layer violation. IP was disqualified in order to conserve protocol layer violation. IP was disqualified in order to conserve protocol
identifiers. identifiers.
4.3. Stateless Protocol 4.3. Stateless Protocol
 End of changes. 

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