A Distributed MARS Service Using SCSP (RFC2443)
Original Publication Date: 1998-Nov-01
Included in the Prior Art Database: 2000-Sep-13
Internet Society Requests For Comment (RFCs)
J. Luciani: AUTHOR [+2]
This document describes a method for distributing a MARS service within a LIS. This method uses the Server Cache Synchronization Protocol (SCSP) to synchronize the MARS Server databases within a LIS. When SCSP is used to synchronize the caches of MARS Servers in a LIS, the LIS defines the boundary of an SCSP Server Group (SG).
Network Working Group J. Luciani
Request for Comments: 2443 Bay Networks
Category: Experimental A. Gallo
A Distributed MARS Service Using SCSP
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 (C) The Internet Society (1998). All Rights Reserved.
This document describes a method for distributing a MARS service
within a LIS. This method uses the Server Cache Synchronization
Protocol (SCSP) to synchronize the MARS Server databases within a
LIS. When SCSP is used to synchronize the caches of MARS Servers in
a LIS, the LIS defines the boundary of an SCSP Server Group (SG).
The keywords MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD,
SHOULD NOT, RECOMMENDED, MAY, and OPTIONAL, when they appear in this
document, are to be interpreted as described in .
The MARS is an extended analog of the ATMARP Server introduced in
. It provides the necessary connection and addressing services
required by layer 3 multicast services over ATM. There are three
basic elements to the MARS model. First, the MARS Server which
manages and distributes layer 3 group membership information to the
LIS. Second, MARS Clients which register with and query a single MARS
Server for layer 3 multicast information. Third, MCS Clients which
register with a single MARS Server and provide layer 3 multicast
forwarding services for a LIS.
Both MARS Clients and MCS Clients explicitly register with the MARS
Server before exchanging layer 3 multicast information. During the
registration process MARS Clients are place on the Cluster Control VC
(CCVC) and MCS Clients are placed on the Server Control VC (SCVC).
Both the CCVC and SCVC are then used to propagate layer 3 multicast
updates to the clients which make up a LIS. During the registration
process MARS Clients are also assigned a unique Cluster Member ID
(CMI) which is used to identify reflected packets in the presence of
In the Distributed MARS Model there MAY be multiple MARS Servers in a
given LIS, and since any MARS Server within the LIS MUST be able to
provide layer 3 multicast information about any multicast group
within the LIS, there MUST be a method by which to synchronize
multicast information across all MARS Servers within the LIS.
The Server Cache Synchronization Protocol (SCSP) solves the