Difference between revisions of "CCNA Explorer 4 Frame relay"
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− | + | *Se [[Frame Relay]] notater. | |
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|[[Image:Exp4fr29.png|800px|left|thumb|Checking Frame Relay Status]] | |[[Image:Exp4fr29.png|800px|left|thumb|Checking Frame Relay Status]] | ||
|- | |- | ||
+ | | | ||
+ | == Split Horizon == | ||
+ | '''Bemærk:''' Der er en fejl i de to tegninger nedenunder. Der står at '''R2''' er en Spoke og '''R1''' er en Hub. Der er vist et '''Full Mesh'''. Der skal ikke være en '''PVC''' mellem '''R2''' og '''R3'''. | ||
+ | |- | ||
+ | |[[Image:Exp4fr30.png|800px|left|thumb|R2 Spoke. R1 Hub]] | ||
+ | |- | ||
+ | |[[Image:Exp4fr31.png|800px|left|thumb|R1 må ikke sende opdatering fra R2 til R3 grundet Split Horizon reglen]] | ||
+ | |- | ||
+ | | | ||
+ | == Frame Relay Subinterfaces == | ||
+ | | | ||
+ | |- | ||
+ | |[[Image:Exp4fr32.png|800px|left|thumb|Frame Relay Subinterfaces]] | ||
+ | |- | ||
+ | | | ||
+ | == Frame Relay Bursting == | ||
+ | {| | ||
+ | |[[Image:Exp4fr33.png|800px|left|thumb|Committed Interface Rate]] | ||
+ | |- | ||
+ | |[[Image:Exp4fr34.png|800px|left|thumb|Eksempel]] | ||
+ | |- | ||
+ | |[[Image:Exp4fr35.png|800px|left|thumb|Bursting]] | ||
+ | |- | ||
+ | |[[Image:Exp4fr36.png|800px|left|thumb|Bursting eksempel]] | ||
+ | |} | ||
+ | *Committed Information Rate | ||
+ | *Committed Burst Information Rate | ||
+ | *Excess Burst | ||
+ | == Frame Relay Flow Control == | ||
+ | *FECN: Forward Explicit Congestion Notification | ||
+ | *BECN: Backward Explicit Congestion Notification | ||
+ | *DE: Discard Eligibility | ||
+ | |- | ||
+ | |[[Image:Exp4fr37-1.png|800px|left|thumb|Committed Interface Rate]] | ||
+ | |- | ||
+ | |[[Image:Exp4fr37.png|800px|left|thumb|Eksempel]] | ||
+ | |- | ||
| | | | ||
+ | |||
+ | == configuring Subinterfaces == | ||
+ | |- | ||
+ | |[[Image:Exp4fr38.png|800px|left|thumb|]] | ||
+ | |- | ||
+ | |[[Image:Exp4fr39.png|800px|left|thumb|]] | ||
+ | |- | ||
+ | |[[Image:Exp4fr40.png|800px|left|thumb|]] | ||
+ | |- | ||
+ | | | ||
+ | |||
+ | == Verifying Frame Relay Operation == | ||
+ | |- | ||
+ | |[[Image:Exp4fr41.png|800px|left|thumb|]] | ||
+ | |- | ||
+ | |[[Image:Exp4fr42.png|800px|left|thumb|]] | ||
+ | |- | ||
+ | |[[Image:Exp4fr43.png|800px|left|thumb|]] | ||
+ | |- | ||
+ | |[[Image:Exp4fr44.png|800px|left|thumb|]] | ||
+ | |- | ||
+ | |[[Image:Exp4fr45.png|800px|left|thumb|]] | ||
+ | |- | ||
+ | | | ||
+ | == Debugging Frame relay operation == | ||
+ | |- | ||
+ | |[[Image:Exp4fr46.png|800px|left|thumb|]] | ||
+ | |- | ||
+ | | | ||
+ | == Overview == | ||
+ | |- | ||
+ | |[[Image:Exp4fr47.png|800px|left|thumb|]] | ||
+ | |- | ||
|} | |} | ||
[[Category:CCNA]] | [[Category:CCNA]] |
Latest revision as of 09:16, 25 January 2012
- Se Frame Relay notater.
Virtual Circuits | ||||
There are two ways to establish VCs:
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(IP) adresse til DLCI mapping | ||||
Statisk Adresse til DLCI mapping | ||||
Dynamisk Adresse til DLCI mappingInterfacet udsender Inverse ARP request på alle kendte DLCI'er og modtager addresse retur. (IP)
LMI - Local Management InterfaceCa. hvert 10. sekund sender DTE'en en LMI en request (Dumb eller FULL) til Frame Relay Switchen (ISP) som returner status. Switchen returnerer svar. (Hvis FULL også en liste med aktive DLCI'er) LMI ExtensionsIn addition to the Frame Relay protocol functions for transferring data, the Frame Relay specification includes optional LMI extensions that are extremely useful in an internetworking environment. Some of the extensions include:
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The 10-bit DLCI field supports 1,024 VC identifiers: 0 through 1023. The LMI extensions reserve some of these identifiers, thereby reducing the number of permitted VCs. LMI messages are exchanged between the DTE and DCE using these reserved DLCIs. There are several LMI types, each of which is incompatible with the others. The LMI type configured on the router must match the type used by the service provider. Three types of LMIs are supported by Cisco routers:
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Configuring Frame Relay | ||||
Eksempel 1 | ||||
Eksempel 2 | ||||
Split HorizonBemærk: Der er en fejl i de to tegninger nedenunder. Der står at R2 er en Spoke og R1 er en Hub. Der er vist et Full Mesh. Der skal ikke være en PVC mellem R2 og R3. | ||||
Frame Relay Subinterfaces |
||||
Frame Relay Bursting
Frame Relay Flow Control
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configuring Subinterfaces | ||||
Verifying Frame Relay Operation | ||||
Debugging Frame relay operation | ||||
Overview | ||||