Enterasys Networks CSX6000, CSX5500, CSX7000 manual PVC Name

CONFIGURING ALTERNATE ACCESSES

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 LINE 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 NAME

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.

COMMITTED 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.

EXCESS 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.

ENABLE/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.

RATE 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.

Central Site Remote Access Switch 259