1. NBMA
   1. Non Broadcast Multi Access
   2. Cannot send broadcasts
      1. can emulate broadcasts
   3. unable to send multi-cast traffic
      1. EIGRP, RIP, OSPF use multicast
   4. Split Horizon Issues
      1. Solutions
         1. Disable Split Horizon
         2. Use Sub Interface
2. Split Horizon Issues with Multipoint
3. Uses Inverse ARP
   1. Maps local DLCI to remote IP Address
   2. Enables emulation of broadcast traffic
      1. on by default
   3. If disabled frame maps must be used
4. Types:
   1. Point to Point
   2. Point to Multipoint (default)
5. Uses Virtual Circuits
   1. PVC's
      1. Permanent Virtual Circuits
6. CIR
   1. Committed Information Rate
      1. assigned link speed by ISP
7. LMI
   1. Local Management Interface
      1. Keep Alive Mechanism
      2. Shows if PVC's are Active or Passive
      3. Provides DLCI Identifier
      4. Three Types of LMI's:
         1. 1. Cisco
         2. 2. Ansi
         3. 3. ITU-T
8. Supports Multiple Topologies
   1. Full Mesh
   2. Partial Mesh
   3. Hub & Spoke
9. Commands
   1. "encapsulation frame-relay"
   2. "show frame relay map"
   3. Disable Inverse ARP
      1. "no frame-relay inverse arp"
   4. Clear Frame Mappings
      1. "clear frame-relay map"
   5. Map Frame Relay (under interface)
      1. "frame-relay map 'ip address' 'local dlci #' broadcast"
   6. Map Frame Relay to Sub-interface
      1. #interface 'interface #' multipoint
         1. #ip address '_______'
            1. #frame-relay map ip 'ip address' 'local DLCI #' broadcast
   7. Disable Split Horizon (under sub-interface)
      1. #no ip split-horizon eigrp 'AS #'
   8. Switch from Multicast to Unicast
      1. #router eigrp 'AS #'
         1. #neighbor 'ip address' 'interface #'
10. Frame Relay Point to Point (sub-interfaces)
    1. Must use different subnets for each PVC
    2. Commands
       1. #interface 'interface #' point to point
          1. #frame-relay interface-dlci 'local DLCI #'
             1. ip address 'ip address of interface'
    3. No Frame Mappings on point to point to configure
    4. No Split Horizon issues
11. Frame Relay Bandwidth Utilization
    1. EIGRP uses up to 50% of bandwidth for traffic
       1. Bandwidth can be modified on the interface
    2. Point To Point Interfaces
       1. Treated as T1 (1.5 MBPS) interface
       2. Configure to reflect true bandwidth
       3. Use " #bandwidth 'link speed' " to modify bandwidth
          1. Helps keep EIGRP traffic from flooding the interface
             1. Called "Bandwidth Pacing"
       4. Configure Sub-Interfaces
          1. separate subnets
       5. On Spoke routers change bandwidth to calculation for each PVC on main interface
          1. Use "ip bandwidth-percent" command on sub-interfaces to match 50% of available link speed
    3. Multi Point Interfaces
       1. Bandwidth on physical interface divided by the number of neighbors
          1. Example: 1 Hub @ 256kbps with 10 Spoke Routers connected
             1. 256/10 = 25.6 kbps
       2. To calculate bandwidth for Hub interface multiply slowest link speed x number of neighbors
          1. " #interface 'interface #' "
             1. " #bandwidth 'link speed' "
    4. Commands
       1. Change percentage used for EIGRP traffic
          1. " #ip bandwidth-percentage eigrp 'AS#' 'bandwidth%' "
    5. Hybrid Bandwidth
       1. Combine multiple PVC's of the same speed onto 1 interface
       2. Configure the slowest link on a separate Point to Point interface
       3. Commands:
          1. Hub: " #interface 'interface #' multipoint
             1. " #bandwidth 'link speed' "
          2. Hub: " #interface 'interface #' point to point "
             1. " #bandwidth 'link speed' "