frame relay pvc connection by li, sheng 104419 wide-area network (wan) wide-area network (wan)
DESCRIPTION
WAN connection type Leased lines Circuit switched Packet switchedTRANSCRIPT
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Frame Relay PVC Connection
by
Li , Sheng
104419
Wide-Area Network(WAN)
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Wide-area Network
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WAN connection type
Leased lines
Circuit switched
Packet switched
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WAN connection typeLeased Lines—also known as a point-to-point or dedicated connection,provides a single preestablished WAN communications path from the customerpremises through a service provider network to a remote network .This connection is reserved by the service provider for the client’s private use. Leased lines are very fast but they are also costly.
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WAN connection typeCircuit switched –circuit switched is a WAN switching method in which a dedicated circuit path must exist between sender and receiver for the duration of the call. Circuit-switched connection are commonly used in environments that require onlysporadic WAN usage. For example, It is used by service provider network when providing ISDN , and it is cheap one.
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WAN connection typePacket switched—Packet switched is a WAN switching method in which networkdevices share a single point to point link to transport packets from a source to a destination across a carrier network. Packet switching offers services similar to Those of leased lines, except the line is shared, and the cost of the service is lower. But the cost of the service is higher than circuit switched connection types.
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WAN connection type
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Wan layer2 encapsulation type
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Wan layer2 encapsulation type
Leased line : HDLC, PPP, SLIP
Circuit-Switched: HDLC, PPP, SLIP
Packet-Switched: X.25, Frame Relay,ATM
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Frame Relay is a data link layer protocol that handles multiple
virtual circuits.
is an standard that defines the interconnection process between your router and service provider`s local access switching equipment.
is a connection-oriented data link technology that is streamline to provide high performance and efficiency.
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Frame Relay overviewFrame relay only works at User’s DTE ( means Data terminal equipment) and provider’s DCE( data circuit –terminating equipment) or frame relay switch.
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Frame Relay components
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Frame Relay components
VC (Virtual Circuit) : Logical circuit created to ensure communication between two network devices. Include PVCPVC (permanently VC) and SVCSVC(switched VC);
DLCI (Data-link connection identifier): A number that identifies the logical circuit between the router and the frame relay switch.
Inverse ARP(Inverse Address Resolution Protocol): Method of dynamically associating a network layer address with a DLCI.
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Frame Relay link initialization
Each router thought a CSU/DSU connects to theFrame Relay switch.
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Frame Relay link initialization(1)
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Frame Relay link initialization (2)
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Step 5:Frame Relay address mapping
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Step 6:Send Inverse ARP again
6Hello, I am 172.168.5.5
6Hello, I am 172.168.5.7
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Step 7:Keepalive signaling
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Frame Relay link initialization review
Step 1:
Step 2:
Step 3:
Step 4: Step 5: Frame Relay map Step 6: Step 7: Keepalives message(every 10 seconds)
csu/dsu
Status inquiry
Local DLCI number and status
Inverse ARP
Inverse ARP(every 60 seconds)
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Connection Type Applications
Leased Lines High control, full bandwidth, high-cost enterprise networks, and last-mile access
Frame Relay Medium control, shared bandwidth, medium cost enterprise backbone; branch sites
ISDN Low control, shared bandwidth, more bandwidth than dialup
Asynchronous Dialup
Low control, shared bandwidth, variable cost-effectiveness for limited use connections like DDR
X.25 Low control, shared bandwidth, variable cost-effectiveness for limited use connections, high reliability
WAN Connection Considerations
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WAN Connection Considerations
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References
Interconnecting Cisco network devices (Cisco press , Edited by Steve McQuerry)
Online version of the BCRAN (Cisco's e-learning )