Avaya Configuring XNS Services Manuel d'utilisateur télécharger pdf (Page 28)

Configuring XNS Services

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Sequenced Packet Protocol

The Sequenced Packet Protocol (SPP) is a Level 2 protocol. It supports the

reliable transmission of sequenced internet packets between clients on the

network. SPP uses IDP to create a virtual circuit between the source and

destination endpoints.

SPP has an open connection when it knows the address (host and socket number)

and the connection identiﬁcation for both connection endpoints. When packets

start passing over a new connection, SPP assigns sequence number 0 (zero) to the

ﬁrst packet transmitted.

SPP supports extended sessions between connection endpoints, as opposed to PEP

(Packet Exchange Protocol), which requires no connection and supports only

request-response transactions.

SPP speciﬁcations provide information on packet format, standard packet

sequences, and recommendations on how best to use the protocol.

Packet Exchange Protocol

The Packet Exchange Protocol (PEP) is a Level 2 protocol that XNS uses to send

a request and receive a response reliably. PEP handles request-response

transactions without the need to establish a connection between clients. The

Packet Exchange Protocol can send packets to or from any valid socket address.

External Servers

The Bay Networks XNS routing software features external server support.

External server support provides client access to a service on another network if

the service is not available on the client’s network.

You enable external server support from the XNS Interfaces window (refer to

“Editing XNS Interf

ace Parameters” in Chapter 4).

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Avaya Configuring XNS Services Manuel d'utilisateur Page 28