Internet Draft David Peterson
<draft-ietf-ips-fcip-slp-00.txt> Cisco
Expires February 2001
August 2001
Finding FCIP Entities Using SLP
Status of this Memo
This document is an Internet-Draft and is in full conformance with
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Copyright Notice
Copyright (C) The Internet Society (2001). All Rights Reserved.
Abstract
The FCIP protocol provides a method for the tunneling of Fibre
Channel frames over an IP network. This document defines the use of
the Service Location Protocol by FCIP entities to discover one
another, and provides the appropriate SLPv2 templates describing
their services.
1. Acknowledgements
This draft was produced by the FCIP discovery team, including Todd
Sperry (Adaptec), Larry Lamars (SanValley), Robert Snively (Brocade),
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Internet Draft FCIP and SLP August 2001
Ravi Natarajan (Lightsand), Anil Rijhsinghani (McData), and Venkat
Rangan (Rhapsody Networks). Thanks also to Mark Bakke (Cisco) for
initial help and consultation.
2. Introduction
FCIP is a protocol provides a method for the tunneling of Fibre
Channel frames over an IP network. This document defines the use of
the Service Location Protocol (SLPv2) by FCIP entities to discover
one another, and provides the appropriate SLPv2 templates describing
their services.
3. Notation Conventions
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
4. Terminology
Here are some definitions that may aid readers that are unfamiliar
with either SLP, SCSI, or iSCSI. Some of these definitions have been
reproduced from [RFC2608] and "Finding an RSIP Server with SLP"
[RSIP].
User Agent (UA) A process working on the client's behalf
to establish contact with some service.
The UA retrieves service information from
the Service Agents or Directory Agents.
Service Agent (SA) A process working on behalf of one or more
services to advertise the services and
their capabilites.
Directory Agent (DA) A process which collects service
advertisements. There can only be one DA
present per given host.
Scope A named set of services, typically making
up a logical administrative group.
Service Advertisement A URL, attributes, and a lifetime
(indicating how long the advertisement is
valid), providing service access
information and capabilities description
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for a particular service.
FCIP Entity The principle FCIP interface point to the
IP network.
FCIP Entity Name The world wide name of the switch if the
FCIP Entity resides in a switch or the
world wide node name of the associated
Nx_Port.
FCIP Discovery Domain The FCIP Discovery Domain specifies which
FCIP Entities are allowed to connect
within the bounds of the scope.
5. Using SLP for FCIP Service Discovery
At least two FCIP Entities must be involved in the entity discovery
process. The end result is that an FCIP Entity will discover one or
more peer FCIP Entities.
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5.1. Discovering FCIP Entities using SLP
The following example diagram shows the relationship between FCIP
Entities and their associated SLP agents.
+--------------------------------------+
| FCIP Entity |
+----------------------------------+ |
| FCIP Control and Services Module | |
+----------------+ | |
| SA | UA | | |
+----------------+-----------------+ |
| TCP/UDP/IP | |
+----------------+-----------------+ |
| Interface | |
| 180.10.1.10 | |
+----------------+-----------------+---|
|
+------------+ |
| SLP DA |----+ IP Network
+------------+ |
|
+----------------+-----------------+---|
| Interface | |
| 190.10.1.20 | |
+----------------+-----------------+ |
| TCP/UDP/IP | |
+----------------+-----------------+ |
| SA | UA | | |
+----------------+ | |
| FCIP Control and Services Module | |
+--------------------------------- + |
| FCIP Entity |
+--------------------------------------+
Fig. 1 FCIP Entity and SLP Agent Relationship.
As indicated in the above drawing above, each FCIP Entity contains an
FCIP Control and Services Module that interfaces to an SLPv2 SA and
UA.
The SA constructs a service advertisement of the type
"service:fcip:entity" for each of the service URLs it wishes to
register. The service advertisement contains a lifetime, along with
other attributes defined in the service template.
The remainder of the discovery process is identical to that used by
any client/server pair implementing SLPv2:
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1. If an SLPv2 DA is found, the SA contacts the DA and registers the
service advertisement. If no DA is found, the SA maintains the
service advertisement itself, answering multicast UA queries
directly.
2. When the FCIP Entity requires contact information for a peer FCIP
Entity, the UA either contacts the DA using unicast or the SA using
multicast. The UA includes a query based on the attributes to
indicate the characteristics of the FCIP Entities it requires.
3. Once the UA has the IP address and port number of the FCIP Entity
it may begin the normal connection procedure to the FCIP Entity.
The use of a DA is recommended for SLP operation in an FCIP
environment.
6. FCIP SLPv2 Templates
Two templates are provided: an FCIP Entity template, and an abstract
template to provide a means to add other FCIP related templates in
the future.
6.1. The FCIP Abstract Service Type Template
This template defines the abstract service "service:fcip". It is used
as a top-level service to encapsulate all other FCIP related
services.
Name of submitter: David Peterson
Language of service template: en
Security Considerations:
See the security considerations of the concrete service type.
Template Text:
-------------------------template begins here-----------------------
template-type=fcip
template-version=0.1
template-description=
This is an abstract service type. The purpose of the fcip service type
is to encompass all of the services used to support the FCIP protocol.
template-url-syntax =
url-path= ; Depends on the concrete service type.
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--------------------------template ends here------------------------
6.2. The FCIP Entity Concrete Service Type Template
This template defines the service "service:fcip:entity". A device
containing FCIP Entities that wishes to have them discovered via
SLPv2 would register each of them, with each of their addresses, as
this service type.
FCIP Entities wishing to discover other FCIP Entities in this manner
will generally use one of the following query strings:
1. Find a specific FCIP Entity, given its FCIP Entity Name:
Service: service:fcip:entity
Scope: fcip-entity-scope-list
Query: (fcip-entity-name=10:00:00:60:69:20:34:0C)
2. Find all of the FCIP Entities within a specified FCIP Discovery
Domain:
Service: service:fcip:entity
Scope: fcip-entity-scope-list
Query: (fcip-discovery-domain=fcip-discovery-domain-name)
3. In addition, a management application may wish to discover all
FCIP Entities:
Service: service:fcip:entity
Scope: management-service-scope-list
Query: none
Name of submitter: David Peterson
Language of service template: en
Security Considerations:
See later section.
Template Text:
-------------------------template begins here-----------------------
template-type=fcip:entity
template-version=0.1
template-description=
This is a concrete service type. The fcip:entity service type is used
to register individual FCIP Entity addresses to be discovered by others.
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UAs will generally search for these by including one of the following:
- the FCIP Entity Name for which an address is needed
- the FCIP Discovery Domain Name for which addresses are requested
- the service URL
template-url-syntax =
url-path = ipaddr [ : tcpport ] / fcip-entity-name
ipaddr = DNS host name or ip address
tcpport = decimal tcp port number
fcip-entity-name = FCIP Entity Name
#
# The fcip-entity-name portion of the URL is required and must be the
# FCIP Entity Name of the entity being registered.
# An entity representing multiple endpoints must register each of them
# using SLPv2.
#
# Examples:
# service:fcip:entity://hammer.cisco.com:4000/10:00:00:60:69:20:34:0C
# service:fcip:entity://192.1.3.40:4000/10:00:00:60:69:20:34:0C
#
fcip-entity-name = opaque L
# This must match the fcip-entity-name specified in the url-path.
# The fcip-entity-name is either the Fibre Channel Switch Name if the
# FCIP Entity is embedded in a switch or the Fibre Channel Node Name
# if the FCIP Entity is not embedded in a switch (e.g, an Nx_Port).
fabric-name = opaque O L
# The fabric-name is the World Wide Name of the principal switch.
switch-name = opaque O L
# A name identifier associated with a Fibre Channel switch or bridge device.
# Refer to FC-SW-2 for further information.
node-name = opaque O L
# A name identifier associated with a Fibre Channel node.
# Refer to FC-FS for a description of a Fibre Channel node.
transports = string M L
tcp
# This is a list of transport protocols that the registered entity
# supports. FCIP is currently supported over TCP only.
tcp
mgmt=entity = string O
# The FQDN of the management interface of the FCIP Entity.
mgmt-ipaddr = string O
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# The IP address of the management interface appropriate for SNMP,
# web-based, or telnet management of the FCIP Entity.
fcip-discovery-domain = string M
# The fcip-discovery-domain string contains the name(s) of the FCIP
# discovery domain(s) to which this FCIP Entity belongs.
--------------------------template ends here------------------------
7. Security Considerations
Service type templates provide information that is used to interpret
information obtained by clients through SLP. If the FCIP templates
are modified of if false templates are distributed, FCIP Entities may
not correctly register themselves or may not be able to interpret
service information.
SLP provides an authentication mechanism for UAs to assure that
service advertisements only come from trusted SAs. [RFC2608] If trust
is an issue, particularly with the information sought by the client
about IPSec and IKE support, then SLP authentication should be
enabled in the network.
Once an FCIP Entity is discovered, authentication and authorization
are handled by the FCIP protocol. It is the responsibility of the
providers of these services to ensure that an inappropriately
advertised or discovered service does not comprimise their security.
8. Summary
This document describes how SLPv2 can be used by FCIP Entities to
find other FCIP Entities. Service type templates for FCIP Entities
are presented.
9. References
[RFC2608] E. Guttman, C. Perkins, J. Veizades, M. Day. Service
Location Protocol, version 2 RFC 2608, July 1999.
[RFC2609] E. Guttman, C. Perkins, J. Kempf. Service Templates and
service: Schemes RFC 2609, July 1999.
[RFC2614] J. Kempf, E. Guttman. An API for Service Location
RFC 2614, June 1999.
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[RFC2119] S. Bradner. Key Words for Use in RFCs to Indicate
Requirement Levels. RFC 2119, March 1997.
[RFC3082] J. Kempf, J Goldschmidt. Notification and Subscription for
SLP. RFC 3082, March 2001.
[FCIP] Rajagopal, et. al. "FCIP", draft-ietf-ips-
fcovertcpip-05.txt, August 2001.
[RSIP] Kempf, J., Montenegro, G., "Finding an RSIP Server with
SLP", draft-ietf-nat-rsip-slp-00, February 2000.
Author's Address:
David Peterson
Cisco Systems, Inc.
6450 Wedgwood Road
Maple Grove, MN
USA 55311
Voice: +1 763-398-1007
E-Mail: dap@cisco.com
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