Frame Relay Traffic Shaping with GTS
As first and very basic option, you may use Generic Traffic Shaping to implement FRTS. This is a common technique, not unique to Frame-Relay, with the following properties:
- Configured by using traffic-shape interface command
- As with standard GTS, internal shaper queue is basic WFQ
- Configured per inteface/subinteface (no PVC granularity)
- GTS may adapt to BECNs & reflect FECNs (BECN received at any interface/subinteface PVC will cause shaper rate to throttle back to minCIR)
- FECN reflection activates sending BECNs in responce to incoming FECN frames. Note, that FECN/BECN responce requires provider to mark frames with FECN/BECN bits
- You can configure Fancy-Queueing (WFQ/PQ/CQ) at physical interface level with GTS.
Example:
! ! Physical Interface, fancy-queueing may apply here ! interface Serial 0/0/0:0 no ip address encapsulation frame-relay fair-queue ! ! Subinterface, apply GTS here ! interface Serial0/0/0:0.1 point-to-point ip address 177.0.112.1 255.255.255.0 ! ! Shaping rate ! traffic-shape rate 512000 ! ! "MinCIR", adapt to BECNs ! traffic-shape adaptive 256000 ! ! Reflect FECNs as BECNs ! traffic-shape fecn-adapt frame-relay interface-dlci 112
Verification:
Rack1R1#show traffic-shape
Interface Se0/0/0:0.1
Access Target Byte Sustain Excess Interval Increment Adapt
VC List Rate Limit bits/int bits/int (ms) (bytes) Active
- 512000 3200 12800 12800 25 1600 BECN
Rack1R1#show traffic-shape statistics
Acc. Queue Packets Bytes Packets Bytes Shaping
I/F List Depth Delayed Delayed Active
Se0/0/0:0.1 0 157 10500 0 0 no
Rack1R1#show traffic-shape queue
Traffic queued in shaping queue on Serial0/0/0:0.1
Queueing strategy: weighted fair
Queueing Stats: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/0/32 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 512 kilobits/sec 
About Petr Lapukhov, 4xCCIE/CCDE:
Petr Lapukhov's career in IT begain in 1988 with a focus on computer programming, and progressed into networking with his first exposure to Novell NetWare in 1991. Initially involved with Kazan State University's campus network support and UNIX system administration, he went through the path of becoming a networking consultant, taking part in many network deployment projects. Petr currently has over 12 years of experience working in the Cisco networking field, and is the only person in the world to have obtained four CCIEs in under two years, passing each on his first attempt. Petr is an exceptional case in that he has been working with all of the technologies covered in his four CCIE tracks (R&S, Security, SP, and Voice) on a daily basis for many years. When not actively teaching classes, developing self-paced products, studying for the CCDE Practical & the CCIE Storage Lab Exam, and completing his PhD in Applied Mathematics.
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