RFC 3293
General Switch Management Protocol (GSMP) Packet Encapsulations for Asynchronous Transfer Mode (ATM), Ethernet and Transmission Control Protocol (TCP)
Pages: 9
Proposed Standard
Proposed Standard
Network Working Group A. Doria Request for Comments: 3293 Lulea University of Technology Category: Standards Track J. Buerkle Nortel Networks T. Worster June 2002 General Switch Management Protocol (GSMP) Packet Encapsulations for Asynchronous Transfer Mode (ATM), Ethernet and Transmission Control Protocol (TCP) Status of this Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited. Copyright Notice Copyright (C) The Internet Society (2002). All Rights Reserved.Abstract
This memo specifies the encapsulation of GSMP (General Switch Management Protocol) packets in ATM (Asynchronous Transfer Mode), Ethernet and TCP (Transmission Control Protocol). Specification of Requirements 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 RFC 2119 [7].1. Introduction
GSMP messages are defined in [1] and MAY be encapsulated in several different protocols for transport. This memo specifies their encapsulation in ATM AAL-5, in Ethernet or in TCP. Other encapsulations may be defined in future specifications.
2. ATM Encapsulation
GSMP packets are variable length and for an ATM data link layer they are encapsulated directly in an AAL-5 CPCS-PDU [3][4] with an LLC/SNAP header as illustrated: 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | LLC (0xAA-AA-03) | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | SNAP (0x00-00-00-88-0C) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | ~ GSMP Message ~ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Pad (0 - 47 bytes) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | + AAL-5 CPCS-PDU Trailer (8 bytes) + | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ (The convention in the documentation of Internet Protocols [5] is to express numbers in decimal. Numbers in hexadecimal format are specified by prefacing them with the characters "0x". Numbers in binary format are specified by prefacing them with the characters "0b". Data is pictured in "big-endian" order. That is, fields are described left to right, with the most significant byte on the left and the least significant byte on the right. Whenever a diagram shows a group of bytes, the order of transmission of those bytes is the normal order in which they are read in English. Whenever a byte represents a numeric quantity the left most bit in the diagram is the high order or most significant bit. That is, the bit labelled 0 is the most significant bit. Similarly, whenever a multi-byte field represents a numeric quantity the left most bit of the whole field is the most significant bit. When a multi-byte quantity is transmitted, the most significant byte is transmitted first. This is the same coding convention as is used in the ATM layer [2] and AAL-5 [3][4].) The LLC/SNAP header contains the bytes: 0xAA 0xAA 0x03 0x00 0x00 0x00 0x88 0x0C. (0x880C is the assigned Ethertype for GSMP.) The maximum transmission unit (MTU) of the GSMP Message field is 1492 bytes.
The virtual channel over which a GSMP session is established between
a controller and the switch it is controlling is called the GSMP
control channel. The default VPI and VCI of the GSMP control channel
for LLC/SNAP encapsulated GSMP messages on an ATM data link layer is:
VPI = 0
VCI = 15.
The GSMP control channel MAY be changed using the GSMP MIB.
3. Ethernet Encapsulation
GSMP packets MAY be encapsulated on an Ethernet data link as
illustrated:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Destination Address |
| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| Source Address |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Ethertype (0x88-0C) | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| |
~ GSMP Message ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Sender Instance |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Receiver Instance |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Pad |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Frame Check Sequence |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Destination Address
For the SYN message of the adjacency protocol the Destination
Address is the broadcast address 0xFFFFFFFFFFFF. (Alternatively,
it is also valid to configure the node with the unicast 48-bit
IEEE MAC address of the destination. In this case the configured
unicast Destination Address is used in the SYN message.) For all
other messages the Destination Address is the unicast 48-bit
IEEE. MAC address of the destination. This address may be
discovered from the Source Address field of messages received
during synchronisation of the adjacency protocol.
Source Address
For all messages, the Source Address is the 48-bit IEEE MAC
address of the sender.
Ethertype
The assigned Ethertype for GSMP is 0x880C.
GSMP Message
The maximum transmission unit (MTU) of the GSMP Message field is
1492 bytes.
Sender Instance
The Sender Instance number for the link obtained from the
adjacency protocol. This field is already present in the
adjacency protocol message. It is appended to all non-adjacency
GSMP messages in the Ethernet encapsulation to offer additional
protection against the introduction of corrupt state.
Receiver Instance
The Receiver Instance number is what the sender believes is the
current instance number for the link, allocated by the entity at
the far end of the link. This field is already present in the
adjacency protocol message. It is appended to all non-adjacency
GSMP messages in the Ethernet encapsulation to offer additional
protection against the introduction of corrupt state.
Pad
After adjacency has been established the minimum length of the
data field of an Ethernet packet is 46 bytes. If necessary,
padding should be added such that it meets the minimum Ethernet
frame size. This padding should be bytes of zero and is not to be
considered part of the GSMP message.
Frame Check Sequence
The Frame Check Sequence (FCS) is defined in IEEE 802.3 [6] as
follows:
Note: This section is included for informational and historical
purposes only. The normative reference can be found in IEEE
802.3 Standard [6].
"A cyclic redundancy check (CRC) is used by the transmit and
receive algorithms to generate a CRC value for the FCS field.
The frame check sequence (FCS) field contains a 4-byte (32-bit)
cyclic redundancy check (CRC) value. This value is computed as
a function of the contents of the source address, destination
address, length, LLC data and pad (that is, all fields except
the preamble, SFD, FCS and extension). The encoding is defined
by the following generating polynomial.
G(x)=x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^
7+x^5+x^4+x^2+x^1."
The procedure for the CRC calculation can be found in [6].
After the adjacency protocol has achieved synchronisation, for every
GSMP message received with an Ethernet encapsulation, the receiver
must check the Source Address from the Ethernet MAC header, the
Sender Instance, and the Receiver Instance. The incoming GSMP
message must be discarded if the Sender Instance and the Source
Address do not match the values of the Sender Instance and the Sender
Name stored by the "Update Peer Verifier" operation of the GSMP
adjacency protocol. The incoming GSMP message must also be discarded
if it arrives over any port other than the port over which the
adjacency protocol has achieved synchronisation. In addition, the
incoming message must also be discarded if the Receiver Instance
field does not match the current value for the Sender Instance of the
GSMP adjacency protocol.
4. TCP/IP Encapsulation
When GSMP messages are transported over an IP network, they MUST be
transported using the TCP encapsulation. TCP provides reliable
transport, network flow control, and end-system flow control suitable
for networks that may have high loss and variable or unpredictable
delay.
For TCP encapsulations of GSMP messages, the controller runs the
client code and the switch runs the server code. Upon
initialisation, the server is listening on GSMP's TCP port number:
6068. The controller establishes a TCP connection with each switch
it manages. The switch under control MUST be a multi-connection
server (PORT 6068) to allow creation of multiple control sessions
from N GSMP controller instances. Adjacency protocol messages, which
are used to synchronise the controller and switch and maintain
handshakes, are sent by the controller to the switch after the TCP
connection is established. GSMP messages other than adjacency
protocol messages MUST NOT be sent until after the adjacency protocol
has achieved synchronisation. The actual GSMP message flow will
occur on other ports.
4.1 Message Formats
GSMP messages are sent over a TCP connection. A GSMP message is processed only after it is entirely received. A four-byte TLV header field is prepended to the GSMP message to provide delineation of GSMP messages within the TCP stream. 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type (0x88-0C) | Length | |-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | ~ GSMP Message ~ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Type This 2-byte field indicates the type code of the following message. The type code for GSMP messages is 0x88-0C (i.e., the same as GSMP's Ethertype). Length This 2-byte unsigned integer indicates the total length of the GSMP message only. It does not include the 4-byte TLV header.4.2 TCP/IP Security consideration
When GSMPv3 is implemented for use in IP networks, provisions for security between the controller and client MUST be available and MUST be provided by IP Security [IPSEC]. In this case, the IPSEC Encapsulation Security Payload (ESP) MUST be used to provide both integrity and confidentiality.5. Security Considerations
The security of GSMP's TCP/IP control channel has been addressed in Section 4.2. For all uses of GSMP over an IP network it is REQUIRED that GSMP be run over TCP/IP using the security considerations discussed in Section 4.2. Security using ATM and Ethernet encapsulations MAY be provided at the link layer. Discussion of these methods is beyond the scope of this specification. For secure operation over any media, the IP encapsulation with IPsec SHOULD be used.
References
[1] Doria, A., Sundell, K., Hellstrand, F. and T. Worster, "General Switch Management Protocol (GSMP) V3", RFC 3292, June 2002. [2] "B-ISDN ATM Layer Specification," International Telecommunication Union, ITU-T Recommendation I.361, Feb. 1999. [3] "B-ISDN ATM Adaptation Layer (AAL) Specification," International Telecommunication Union, ITU-T Recommendation I.363, Mar. 1993. [4] "B-ISDN ATM Adaptation Layer specification: Type 5 AAL", International Telecommunication Union, ITU-T Recommendation I.363.5, Aug. 1996. [5] Reynolds, J., Editor, "Assigned Numbers", RFC 3232, January 2002. [6] IEEE Std 802.3, 1998 Edition "Information technology-Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements - Part 3: Carrier sense multiple access with collision detection (CSMA/CD) access method and physical layer specifications" [7] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997.
Authors' Addresses
Tom Worster Phone: +1 617 247 2624 EMail: fsb@thefsb.org Avri Doria Div. of Computer Communications Lulea University of Technology S-971 87 Lulea Sweden Phone: +1 401 663 5024 EMail: avri@acm.com Joachim Buerkle Nortel Networks Germany GmbH & Co. KG Hahnstr. 37-39 60528 Frankfurt am Main Germany EMail: Joachim.Buerkle@nortelnetworks.com
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