RFC 2171 (rfc2171) - Page 3 of 9
MAPOS - Multiple Access Protocol over SONET/SDH Version 1
Alternative Format: Original Text Document
RFC 2171 MAPOS June 1997
+------+ +---------------+
| Node +--------------------------------+ |
+------+ | |
| |
+------+ | |
| Node +--------------------------------+ |
+------+ | |
| Frame Switch |
+------+ | |
| Node +--------------------------------+ |
+------+ | |
| |
+------+ | |
| Node +--------------------------------+ |
+------+ +---------------+
(b) Point-to-Multipoint configuration
+--------+ +--------+
| Frame +----------------------+ Frame |
| Switch +--------+ +--------+ Switch |
+--+-----+ +-+----+-+ +--------+
| | Frame | +--------+
+--+-----+ | Switch | +--------+ | Frame |
| Frame | +-----+--+ | Frame +------+ Switch |
| Switch | +---------+ Switch | ++-------+
+-------++ +--------+ |
|________________________________________|
(c) Switching cluster configuration
Figure 1. Possible configurations
Each port on a switch has an unique identifier within the switch. A
node connected to a switch port must inherit the address of the port.
That is, the node address is equal to the port identifier and is
unique within the switch.
In a switch cluster, a node address is subnetted. The high-order
bits, the part where the corresponding bits in the "subnet mask" are
1, indicate the switch address. The remaining low-order bits
indicate the unique node address within the switch. The two fields
form an unique address for a given node.
In either case, the address may be configured manually into a node
interface, or automatically by the address assignment mechanism
described in [5].
Murakami & Maruyama Informational
