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38 Using Enterprise Edge Services

Enterprise Edge Networking Operations Guide P0910464 Issue 01

Note: Net Link Manager can back up only one link, even though there are two

primary links. Net Link Manager backs up the link whose next hop address

is given to it.

• Net Link Manager manages the default route in Enterprise Edge. If a link

breaks, Net Link Manager removes all the default routes on the broken link and

adds the default route to the new link. This happens during switch over from

primary to secondary links and vice versa.

Permanent WAN Connections

This section includes information on the following topics:

• Frame Relay

•PPP

The permanent WAN connections are provided by a WAN card that supports PPP

and Frame Relay connections. Each port can be configured to run either of the

protocols independently.

The WAN cards are provided by one T1 port (with in-built CSU/DSU) and one

serial sync port or dual serial sync port versions.

The Enterprise Edge serial sync port supports the following:

• Interfaces: V.35, RS442, RS 323, X.21

• Maximum line speed:8 Mbit/sec

Frame Relay

Enterprise Edge supports Frame Relay in group mode. That is, for each physical

port (serial sync or T1 port), there is one IP address for all PVCs.

The available DLCI numbers are 0-1023, of which 16 are reserved. The maximum

number of PVC’s allowed is 1008.

For Frame Relay network, Enterprise Edge supports Frame Relay Forum standard

FRF.9 compression protocol with the standard STAC compression algorithm.

Software performs the compression and it can be enabled or disabled by using

Unified Manager.

PPP

Point-to-Point Protocol (PPP) is a protocol for communication between two

computers using a serial interface, typically a personal computer connected by

phone line to a server. For example, your Internet server provider may provide you

with a PPP connection so that the provider's server can respond to your requests,

pass them on to the Internet, and forward your requested Internet responses back to

you. PPP uses the Internet protocol (IP). PPP is sometimes considered a member of

the TCP/IP suite of protocols. Relative to the Open Systems Interconnection (OSI)

reference model, PPP provides layer 2 (data-link layer) service.

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Avaya EE Networking Guia do Utilizador Página 38