Cisco 1701-K9-RF - 1701 ADSL Security Access Router : Datasheet : Page 96

Lab – Configuring Frame Relay and Subinterfaces

status defined, active

R3# show frame-relay map

Serial0/0/1 (up): ipv6 FE80::1 dlci 301(0x12D,0x48D0), static,

broadcast,

CISCO, status defined, active

Serial0/0/1 (up): ipv6 2001:DB8:ACAD:B::3 dlci 301(0x12D,0x48D0), static,

CISCO, status defined, active

Serial0/0/1 (up): ip 10.1.1.2 dlci 301(0x12D,0x48D0), static,

CISCO, status defined, active

Serial0/0/1 (up): ipv6 2001:DB8:ACAD:B::1 dlci 301(0x12D,0x48D0), static,

CISCO, status defined, active

Serial0/0/1 (up): ip 10.1.1.1 dlci 301(0x12D,0x48D0), static,

broadcast,

CISCO, status defined, active

Serial0/0/1.311 (up): point-to-point dlci, dlci 311(0x137,0x4C70), broadcast

status defined, active

Reflection

1. What is a PVC and how is it used?

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A PVC is a permanent virtual circuit. This is a Layer 2 connection created between endpoints through a

Frame Relay cloud. There can be multiple PVCs per physical interface, allowing multiple point-to-point

connections or point-to-multipoint connections.

2. What is the purpose of a DLCI?

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A DLCI is a Layer 2 Frame Relay address that Inverse ARP uses to obtain an associated Layer 3 IP address.

3. What purpose does the Local Management Interface (LMI) serve in a Frame Relay network?

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The LMI is a signaling protocol that exchanges information between a router and a Frame Relay switch. The

LMI exchanges information on keepalives, PVC status (active, inactive, deleted, unused), and IP addresses

(when Inverse ARP is enabled). This information is used as a status mechanism between the router (DTE)

and the Frame Relay switch (DCE).

4. Why would you use subinterfaces with Frame Relay?

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