Frame-Relay fragmentation to support realtime traffic

November 25, 2008 at 11:32 pm | Posted in Blogroll | 1 Comment

Tags: WB1, QoS, Frame-Relay, Link Efficiency


  • The connection between R3 and R5 is used to send data and voice traffic.
  • Configure Frame Relay fragmentation so that voice packets are never delayed for more than 10ms when serialized.
  • Assume the speed of R3’s connection is 384Kbps


map-class frame-relay TO_R5
frame-relay fragment 480
interface Serial 1/0
no ip mtu
map-class frame-relay TO_R3
frame-relay fragment 480
interface Serial 0/0
no ip mtu


Rack1R3#show frame-relay pvc 305
PVC Statistics for interface Serial1/0 (Frame Relay DTE)
  input pkts 0             output pkts 0            in bytes 0        
  out bytes 0              dropped pkts 0           in pkts dropped 0        
  out pkts dropped 0                out bytes dropped 0        
  in FECN pkts 0           in BECN pkts 0           out FECN pkts 0        
  out BECN pkts 0          in DE pkts 0             out DE pkts 0        
  out bcast pkts 0         out bcast bytes 0        
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
  pvc create time 00:00:37, last time pvc status changed 00:00:37

Doc CD Navigation

  • Cisco IOS Wide-Area Networking Configuration Guide, Release 12.4
  • Part 1: Configuring Frame Relay
  • Frame Relay Queueing and Fragmentation at the Interface
  • Configuration Tasks
  • Configuring Queueing and Fragmentation on the Frame Relay Interface

1 Comment »

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  1. Hey man.
    I work in IT too; a guy at my job just got his CCIE. I hope you did too, you’ve been inactive for a few months, I’m guessing you’re done studying or something.

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