Avaya BCM 4.0 Networking Guide de configuration télécharger pdf (Page 571)

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Chapter 63 Configuring Net Link Manager 571

BCM 4.0 Networking Configuration Guide

Selecting a dial-up link as the primary WAN connection

The dial-up WAN connection supports PPP only. BCM supports ISDN dial-up and PPPoE dial-up

WAN connections.

Setting a dial-up connection as the primary WAN connection means that the BCM default route is

to the dial-up connection. If the dial-up WAN connection is configured as dial-on-demand, any

traffic across the dial-up WAN connection causes the link to be established. Also, if there is no

traffic crossing the connection, the link shuts down automatically after a time out.

Switch-over delay (s) <0- 3600000> Define the interval, in seconds, that Net Link Manager waits

before switching back to the primary WAN link when it

becomes available. This delay is to let the router at the other

end of the primary link recognize that the primary link has

come up and allows for necessary routing table updates.

Default: 30 seconds

Enable fast

switch-over

<check box> Enable or disable the Fast switch-over feature.

When Fast switch-over is enabled, BCM uses the Link Status

of the WAN interface to quickly detect an interface failure and

switch over to the Backup WAN Link, when the Primary WAN

Link is down.

When Fast switch-over is Disabled, BCM pings the remote

router if there is no response from the previous attempt.

Note: If there is no response after five retries, BCM switches

over to the Backup WAN Link.

When Fast switch-over is Enabled, BCM checks the Link

Status of the WAN interface when there is no response from

the next hop router. If the Link Status is Down, BCM

immediately switches over to the Backup WAN link. If the link

status is Up, BCM attempts to contact the next hop router

again. If there is no response after several retries, BCM

switches over to the Backup WAN Link.

Note: PPP active/WAN link switch over delay issue: If you

enable Fast Backup Switch Over on a WAN link that is using

PPP protocol, change the setting for LCP Keep Alive Interval

to 3. This reduces the time it takes for BCM to determine that

the WAN link is not functioning to 30 seconds (3 seconds X 10

intervals). If you leave the LCP Keep Alive Interval at its default

value, the BCM takes 100 seconds (10 seconds X 10 intervals)

to determine that the WAN link is not functioning.

Note: If BCM receives a response from the next hop router on

any attempt, it does not switch over to the Backup WAN Link.

Note: The Fast switch-over feature does not affect how BCM

switches from the Backup WAN Link to the Primary WAN Link.

Default: Disabled.

Table 134 Permanent WAN connection settings (Sheet 2 of 2)

Attribute Value Description

1 2 ... 566 567 568 569 570 571 572 573 574 575 576 ... 757 758

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Avaya BCM 4.0 Networking Guide de configuration Page 571

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