3Com SuperStack II, NETBuilder SI Configuring Disaster Recovery, Enable disaster recovery using

92CHAPTER 7: ADVANCED CONFIGURATION OF PORTS AND PATHS

increase to 32 Kbps (50% of 64 Kbps). After the additional 64 Kbps line is up, total bandwidth available is 128 Kbps. To activate the next line, traffic would have to increase to 64 Kbps (50% of 128 Kbps). The same process happens in reverse to deactivate the additional lines.

3Specify the amount of time bandwidth management should wait to take action to activate or deactivate a port using:

SETDefault !<port> -PORT DialSamplPeriod = <seconds>(0–300),

(0–300)

Example To configure a line with a normal bandwidth of 28.8 kbps, enter:

SETDefault !4 -PORT BODIncrLimit = 28.8

SETDefault !4 -PORT BODTHreshold = 50

SETDefault !4 -PORT DialSamplPeriod = 30, 60

Traffic must exceed 14.4 kbps for 30 seconds before an additional dial path is activated. The additional dial path is deactivated when the rate of traffic is less than 28.8 kbps for longer than 60 seconds.

Configuring Disaster Recovery

If the primary PPP line fails, the bridge/router can use a reserved dial-up line as back-up. See Chapter 8 to fine-tune the disaster recovery line for your routing protocol.

To enable disaster recovery, follow these steps:

1Enable dial-on-demand.

2Add the back-up path to the same port as the primary line using:

ADD !<port> -PORT PAths <port> [,<port>...]

3Enable disaster recovery using:

SETDefault !<port> -PORT DialCONTrol = DisasterRcvry

4Configure the back-up line for disaster recovery only using:

SETDefault !<path> -PATH DialCONTrol = DisasterRcvry

5Configure the dial number list for the back-up line using:

ADD !<port> -PORT DialNoList “<phone no>” [Baud = <rate>

(1.2–16000)] [Type = Modem Bri Sw56] [Pos = <number>]

See “Working with Dial Number Lists” on page 113 for more information about dial number lists.