Cisco CCNA Study Guide - Router Alley

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CCNA Study Guide v2.62 – Aaron Balchunas 290 Frame-Relay CIR Bandwidth is provided on a best effort basis in Frame-Relay. The Frame provider and customer agree on a Committed Information Rate (CIR), which is not always a guarantee of bandwidth. The provider will give a best effort to meet the CIR, which is measured in bits per second: • 256000 bps • 512000 bps • 1544000 bps The above are examples of possible CIR settings, though technically the CIR can be set to anything. At times, bandwidth speeds can burst (Be) above the CIR. However, speeds above the CIR are certainly not guaranteed, and if the Frame Network becomes congested, any data exceeding the CIR becomes Discard Eligible, and is at risk of being dropped. Frame-Relay Encapsulation Types On Cisco routers, two possible Frame encapsulations can be configured on the router’s serial ports. • Cisco – the default, and proprietary, Frame-Relay encapsulation • IETF – the standardized Frame-Relay encapsulation. Frame-Relay Local Management Interface (LMI) LMI is the type of signaling used between your router and your provider’s Frame-Relay switch. LMI provides status updates of Virtual Circuits between the Frame switch and the router. There are three LMI-types: • Cisco – default and proprietary (naturally) • ANSI • Q.933a LMI type is auto-sensed on Cisco routers, but can be manually set if desired. * * * All original material copyright © 2013 by Aaron Balchunas (aaron@routeralley.com), unless otherwise noted. All other material copyright © of their respective owners. This material may be copied and used freely, but may not be altered or sold without the expressed written consent of the owner of the above copyright. Updated material may be found at http://www.routeralley.com.
CCNA Study Guide v2.62 – Aaron Balchunas 291 Frame-Relay Point-to-Point Configuration Example Point-to-Point is the simplest form of Frame-Relay configuration. Remember that PVCs are only one-way circuits, and thus we need to create two PVCs in order for full communication to occur. Configuration on the Detroit and Chicago routers would be as follows: Detroit Router: Chicago Router: Router(config)# int s0/0 Router(config-if)# ip address 172.16.1.1 255.255.0.0 Router(config-if)# encapsulation frame-relay Router(config-if)# frame-relay lmi-type q933a Router(config-if)# frame-relay interface-dlci 102 Router(config-if)# no shut Router(config)# int s0/0 Router(config-if)# ip address 172.16.1.2 255.255.0.0 Router(config-if)# encapsulation frame-relay Router(config-if)# frame-relay lmi-type q933a Router(config-if)# frame-relay interface-dlci 201 Router(config-if)# no shut Notice that both routers are in the same IP subnet. The encapsulation frame-relay command sets the frame encapsulation type to the default of cisco. The encapsulation must be the same on both routers. To change the default encapsulation type, simply append the ietf keyword to the encapsulation frame-relay command: Router(config)# int s0/0 Router(config-if)# ip address 172.16.1.1 255.255.0.0 Router(config-if)# encapsulation frame-relay ietf The frame-relay lmi-type command sets the signaling type. The Frame- Relay provider dictates which LMI-type to use. Remember that cisco is the default LMI-type, and that LMI is usually auto-sensed. * * * All original material copyright © 2013 by Aaron Balchunas (aaron@routeralley.com), unless otherwise noted. All other material copyright © of their respective owners. This material may be copied and used freely, but may not be altered or sold without the expressed written consent of the owner of the above copyright. Updated material may be found at http://www.routeralley.com.
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