Page 566 - Handbook of Modern Telecommunications

Network Organization and Governance 4-97

TABl E 4.5.4 Service-Level Agreements
SLA ID for Clients Client 1 SLA ID = 01 Client 2 SLA ID = 01
SID1 SID1
SID2
SID3
Client 2 Sl A ID = 02

SID2

Client 2 Sl A ID = 03

SID3

• Provider A router and provider B router must exchange routing information with each other. The
alternatives are:
• Policy Based Routing (bad scalability due to the fact of the need of many manual entries,
very CPU intensive, acceptable performance can only be guaranteed by high-performance
hardware)
• Static routing
• RIP (technically making sense)
• OSPF is meaningful, when IP VPNs and MPLS are well supported
• EBGP (technically meaningful)
• Measurement and testing points for QoS control are located on the router ports that are toward to
the peering point; this makes it possible for routers to measure themselves.
• Due to the fact that the peering point represents the ingress point onto the “other” network, the
ingoing packet will be repeatedly identified. This includes the following:
• Traffic specification, e.g., policy selection
• Class of Service decision, e.g., priority queuing
• Call Admission Control
• Inserting firewalls into this path must be excluded; over firewalls, no quality guarantees may be
given.

4.5.3.3.7 Establishing and Unifying Management Concepts
In case of multiple service providers, it is mandatory to administer and handle managed objects on the
basis of unified guidelines. The following functional areas should be addressed by enterprises, repre-
sented by their overseers, and by all service providers, and their subcontractors.
The structure consists of a basis management platform and application areas.
The basis platform provides functions that are required by all management applications. It helps to
coordinate all management tasks. The following functional grouping is recommended:

• Infrastructure (hardware, software, directory services, time services, and asset management)
• Basis services (internal communication, graphical user interface, Web server functions, data-
base services)
• Support services for operations (installation, backup, workforce management, order processing,
recovery, housekeeping, software distribution)