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What does PVC stand for and what does it do?
Permanent Virtual Circuit - the connection configured by the service provider - each link between routers is a PVC. Synonymous to a leased line provided by the service provider.
What does LAR stand for and what does it do?
Local Access Rate - the theoretical max speed on a line; how fast can the physical line (cable) actually go
What is the LMI? What are the major LMIs?
Local management interface - the protocol used over frame relay. Cisco, ANSI, and ITU-T Q.933A
What is the CIR and why is it important?
Committed Information Rate - the guaranteed minimum bandwitdh on the line
What is a DLCI?
Data link connection identifier - the equivalent of a MAC in Ethernet
Can DLCIs be duplicated? Why or why not?
DLCIs can be duplicated since they are not shared between routers.
DLCIs are ports that have a ______ ______
fixed destination. Like a train platform - the platform always goes to the same destination.
How is MPLS different than frame relay?
MPLS uses tagging rather than DLCIs. They allow different networks types to communicate.
What are the 3 types of frame relay topology?
- Full mesh - every site has a direct connection to each other
- Hub and spoke - all branches connect to a CO
- Partial mesh - like hub and spoke, but some connections can bypass the hub
What is the design used if all routers are on the same subnet?
What is the advantage of multipoint frame relay
IP addresses are saved
What network topologies can multi-point be used on?
Full mesh only - hub and spoke/partial mesh will have problems with split horizons. It's possible to setup multi-point on hub and spoke, but it is not recommended.
What are frame maps used for?
Frame maps are used to point to a destination that is not directly connected to the source. Used for hub and spoke topologies.
How do you verify the DLCIs gathered from LMI?
show frame-relay pvc
What are the 3 PVC status?
- Inactive - local configuration is OK but the remote is not answering
- Active - Connection is working
- Deleted - the router is using a DLCI that does not exist on the service provider
How do you statically define a DLCI on a router?
Create a frame map: frame-relay map ip [destination] DLCI
How do you turn on Frame Relay?
How do you check the interface configuration information for Frame Relay
- show frame-relay map
- See the IP address, the assigned DLCI, Dynamic (says that the map entry was detected and not statically defined), broadcast (routing protocols will work)
How does a router map an IP address to a DLCI?
The router sends an Inverse ARP message down the DLCI to the other side; the opposite side provides its IP address. The DLCI and IP address are then recorded as a dynamic entry
How do you shut off split horizon checks for EIGRP?
no ip split-horizon eigrp 1
What type of interface is used in point to point topologies for the hub's interface and what is the command to configure them?
Sub interfaces: interface serial 0/0.[ID] point-to-point
How do you assign a DLCI to a sub-interface?
frame-relay interface-dlci [ID]
What commands shows the frame relay routing table?
show frame-relay route
What are the two types of encapsulation that can be used in frame relay?
- Cisco and IETF.
- ANSI, Cisco, and Q933A are LMI protocols.
- IETF is used in heterogeneous environments
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