Vsm Overview; Multiple System Solution; Hybrid Service Solution - Alcatel-Lucent 7750 SR OS Service Manual

VSM Overview

VSM Overview
In many instances, it is desirable to process a stream of packets from one or more subscribers
through multiple features that, for one reason or another, are mutually exclusive in the 7750 SR
forwarding planes. For example, multiple subscriber sites could be bridged together through a
VPLS instance while requiring in-service high speed Internet access (IES). Functionality of this
type can be handled several ways:
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For the purpose exploring each of these solutions, the VPLS and IES service interconnection
scenario is examined.

Multiple System Solution

The multiple system (meaning multiple boxes) solution splits the functionality between two
distinct nodes. The first node performs the VPLS bridging functions while maintaining per site
QoS and accounting functions. The second node connects to the first node as a destination in the
VPLS service. This connection could be configured as a SAP to SAP or a pseudo-wire spoke
connection.

Hybrid Service Solution

The hybrid solution merges the two services into a single, common service. This can be
accomplished for our example service interconnect by either supporting a virtual IP interface in
the context of a VPLS service or providing an IP-only solution that provides for multiple SAPs on
a single IES IP interface.
The hybrid solution does not provide for separate accounting and QoS for packets forwarded (or
routed) between the subscriber sites and the packets routed to next-hops outside the subscriber
domain.
Page 1228
Multiple System Solution on page 1228
Hybrid Service Solution on page 1228
Single System Multiple Interface Solution on page 1229
Full Feature Internal Service Cross Connect Solution on page 1229
7750 SR OS Services Guide