Enterasys Networks CSX7000 Manuel d'utilisateur télécharger pdf (Page 259)

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Central Site Remote Access Switch 259

ONFIGURING

LTERNATE

CCESSES

Frame Relay Accesses

network, the one to which the access line is directly connected, routes the packet to the intended

destination based on the DLCI therein. Hence, each packet is routed independently through the

network based on the addressing information provided by this identifier.

PVC L

INE PROTOCOL

The PVC line protocol determines which type of data encapsulation will be used on the PVC. The

options are PPP Point to Point Protocol or FR_IETF. PPP allows PPP authentication for the

associated device. FR_IETF is a multiprotocol encapsulation for Frame Relay, currently specified

by RFC 1490. FR_IETF protocols include IP, MAC Layer Bridge, IPX, and AppleTalk. The default

PVC line protocol is PPP.

PVC N

AME

The PVC name associates the PVC with a device table entry, whether it is defined in an on-node or

off-node database. The PVC name must match the device name for both on-node and off-node

databases. However, if a virtual circuit has been configured with PPP as the line protocol, and the

associated on-node device entry has enabled outbound authentication, then the names are not

required to match.

OMMITTED INFORMATION RATE (IN KBITS/SECOND)

A frame relay circuit has two transmission rates associated with it: the Committed Information Rate

(CIR) and an Excess Information Rate (EIR). The committed information rate is the bandwidth

requested for a PVC at service subscription time. This parameter should be available from the

service provider at subscription time. Even if you do not wish to pay extra for a CIR from your

carrier, we recommend configuring CIR where the following is true:

physical speed/number of PVCs = CIR

This configuration allows quick alleviation of congestion. For a more in-depth explanation of the

Committed Information Rate, refer to the Data Rate Control Overview.

XCESS INFORMATION RATE (IN KBITS/SECOND)

The Excess Information Rate is the bandwidth available above and beyond the committed rate. The

frame relay software has the capability to transmit data above the committed information rate up

to the excess information rate. This parameter should be available from the service provider at

subscription time. For a more in-depth explanation of the Excess Information Rate, refer to Data

Rate Control Overview.

NABLE/DISABLE CONGESTION CONTROL

Congestion Control can be enabled or disabled. This parameter should only be disabled for captive

networks or those users very familiar with the Frame Relay Service. For a more in-depth

Congestion Control explanation, refer to Congestion Control Overview.

ATE MEASUREMENT INTERVAL (IN MSECS)

The Rate Measurement Interval in combination with the current transmit or receive rate is used to

determine the number of bytes that can be handled in a single rate monitoring period on a given

PVC. This parameter should only be changed for those users very familiar with the Frame Relay

Service. For a more in-depth explanation, refer to Data Rate Control Overview.

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Enterasys Networks CSX7000 Manuel d'utilisateur Page 259

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