Avaya Configuring Data Compression Services Manuel d'utilisateur télécharger pdf (Page 34)

Configuring Data Compression Services

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Dial Backup

PPP also allows you to conﬁgure a dial backup feature. If a primary PPP line fails

and you have enabled dial backup, the router automatically establishes a backup

line. You cannot enable any protocols, including compression, on a backup circuit,

because a backup circuit inherits its protocols from the primary circuit. If the

primary circuit uses compression, then the backup circuit does also.

For further information on Bay Networks dial services, see Conﬁguring Dial

Services.

X.25 Services

An X.25 network permits as many as 128 VCs to exist on the same physical link at

the same time. You can conﬁgure each of those interfaces individually to use data

compression or not.

X.25 PDN and DDN Services

When you use data compression on circuits that you conﬁgure for X.25 PDN or

DDN services, you must be careful to enable compression on both sides of the

link. If you conﬁgure compression on only one side of a PDN or DDN link, the

data that travels over that link will be garbled.

You must also remember to enable the X.25 service record compression parameter

for each X.25 interface you conﬁgure. See Conﬁguring X.25 Services for more

information about this parameter.

X.25 Max Window Size Parameter

Window size can affect packet throughput across the X.25 network. Setting the

X.25 Max Window Size parameter too low can cause the router to drop packets

and render data compression ineffective. You should conﬁgure this parameter at a

higher value than the default setting.

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Avaya Configuring Data Compression Services Manuel d'utilisateur Page 34