global network & network management **** iec teacher workshop june 28, 2012 prof. mani...
TRANSCRIPT
Global Network & Network Management
****IEC Teacher Workshop
June 28, 2012
Prof. Mani Subramanian
2
Notes
LAN-WAN Network
LAN A LAN B
LAN C
Bridge /Router
Bridge /Router
Bridge /Router
WANcommunication link
Figure 1.5(b) Remote LANs Interconnected by WAN
Chapter 1 Data Communications and NM Overview
Network Management: Principles and Practice© Mani Subramanian 2010
3
Notes
TCP/IP Based Networks
• TCP/IP is a suite of protocols• Internet is based on TCP/IP• IP is Internet protocol at the network layer level• TCP is connection-oriented transport protocol and ensures end-to-end connection• UDP is connectionless transport protocol and provides datagram service• Internet email and much of the network mgmt. messages are based on UDP/IP• ICMP part of TCP/IP suite
Chapter 1 Data Communications and NM Overview
Network Management: Principles and Practice© Mani Subramanian 2010
4
Notes
Internet Configuration
LAN A LAN B
LAN C
Bridge /Router
Bridge /Router
Bridge /Router
LAN Y LAN Z
LAN X
Bridge /Router
Bridge /Router
Bridge /Router
WAN
Workstation
Mail Server
Figure 1.8 Internet Configuration
Mail Server
Workstation
Gateway
Gateway
DomainNameServer
Workstation(Joe)
PC (Sally)
• Walk through the scenario of email from Joe to Sally
Chapter 1 Data Communications and NM Overview
Network Management: Principles and Practice© Mani Subramanian 2010
5
Notes
Broadband Network
Chapter 1 Data Communications and NM Overview
Figure 1.19 Broadband Network Segments and Technologies
Network Management: Principles and Practice© Mani Subramanian 2010
EdgeRouter
Cable
DSL
FixedWireless
MobileWireless
Satellite
PON
ResidentialGateway
LAN
WLAN
HomePlug
Bluetooth
HomePNA
Cable
AccessNetwork
CPENetwork
IP
ATM
WAN
UWB
Hybrid
MPLS
6
Notes
Broadband Access Networks
IP / ATMWAN
Business Customers
Cable ModemCustomerNetwork
OC-n /STS-n
Link
HFCNetwork
CableModem
DSLCustomer
Network
xDSLModem
TelephoneLoop
FixedWirelessCustomerNetwork
CableModem
Head End
CentralOffice
Equipment
Router/ATM Switch
Router/ATM Switch
TerrestrialWireless
Satellite Communication
Access Point Network
MobileUnit
BSU
BSU
Figue 1.20 Broadband Access Networks
Chapter 1 Data Communications and NM Overview
Network Management: Principles and Practice© Mani Subramanian 2010
Notes
Information Technology Services
1-3
IT Services
• Computer and Data Processing Services• Networking services• System resources• Application resources• Server resources• Storage and retrieval• Back up / Archival
• Telecommunication Services• Voice & Video services• Network Management• System Management
• Network management is concerned with managing the transportation of information
• System management deals with managing system resources
Network Management OverviewÓ Copyright 1998 Mani Subramanian
Notes
3-3
NM Basics
Network Management Components
• Network Elements (Objects): workstations, hubs, bridges, routers…
• Network Management Agent• Software that monitors network elements• Reports to NMS (Network Management System)• Responds to queries from NMS• Reports alarms to NMS• May be stand alone unit or embedded in an element
NMS
NetworkAgent
NetworkAgent
NetworkObjects
NetworkObjects
Network Management OverviewÓ Copyright 1998 Mani Subramanian
Notes
3-4
NM Basics
• Network Management System (NMS)• Presents a global, topological, or geographical picture of
the network• Presents visual alarms of faults• Helps localize problems that occur• Queries agents for status of network elements• Accepts alarm notifications from network management
agents
NMS
NetworkAgent
NetworkAgent
NetworkObjects
NetworkObjects
Network Management Components (cont.)
Network Management OverviewÓ Copyright 1998 Mani Subramanian
Notes
3-10
NM Basics
Manager of Managers
• Here a Manager of Managers (MoM) monitors several subnetworks at once, by integrating the data obtained from various Agent NMSs.
Network Management OverviewÓ Copyright 1998 Mani Subramanian
MoM
Agent NMS
Managed objects
Agent NMS
Managed objects
Agent process
MDB
MDB MDB
MoM Manager of ManagerMDB Management Database
3-11
NM Basics
Notes
SNMP ManagerApplication
Get-
Resp
onse
Get-
Request
GetN
ext
-Request
Set-
Request
Tra
p
SNMP Manager
SNMP
UDP
IP
DLC
PHY
SNMP AgentApplication
Get-
Resp
onse
Tra
p
SNMP Agent
SNMP
UDP
IP
DLC
PHY
Physical Medium
Manage-mentData
Get-
Request
GetN
ext
-Request
Set-
Request
SNMPv1 Architecture
• The get-request message is generated by the manager. Value of an object is a scalar variable.
• The get-next-request (or simply get-next) obtains the value of the next instance of the object in the Management Information Base (MIB) tree.
• The set-request is generated by the manager to initialize or reset the value of an object.
• The get response message is generated by the agent in response to get-request, get-next, or set-request from the manager.
• Trap is unsolicited alarm sent by agent to the manager.
Network Management OverviewÓ Copyright 1998 Mani Subramanian