Avaya Configuring Frame Relay Services Manual de usuario descargar pdf (Pagina 38)

Configuring Frame Relay Services

2-14 114058 Rev. A

Figure 2-8. Detecting and Controlling Network Congestion

If you enable the congestion control feature, you can specify the number of

FECN/BECN bits the router receives in a given time period before it stops

transmitting frames. While frames are going across the network, the Frame Relay

interface checks received packets for FECN and BECN bits set to 1. If the

interface receives the speciﬁed number of bits during the designated time period,

Frame Relay drops all trafﬁc destined for the PVC where there is congestion.

When the interface no longer receives these congestion notiﬁcations, the router

resumes transmission.

For example, suppose you set the congestion timer to 0.5 seconds and the

congestion count to 3. In this case, if an interface receives 3 FECNs or BECNs

within 0.5 seconds, the node stops sending frames (although it continues to

receive frames for this PVC). If the interface receives no FECNs or BECNs during

the next 0.5 seconds, the router resumes transmission. Refer to Chapter 3 for

instructions on conﬁguring the congestion parameters.

Congestion

Direction

BECN

FECN

Frame Relay

Network

Node

Frame Relay

Network

Node

Frame Relay

Network

Node

FR0010A

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Avaya Configuring Frame Relay Services Manual de usuario Pagina 38