CCNA Cisco Certified Network Associate Study Guide - FTP Server

Optional Commands
Dial-on-Demand Routing (DDR) 515
ip route 172.16.30.0 255.255.255.0 172.16.60.1
ip route 172.16.60.1 255.255.255.255 BRI0
!
dialer-list 1 protocol ip permit
!
The BRI interface is running the PPP encapsulation and has a timeout
value of 300 seconds. The load-threshold command makes both BRI
interfaces come up immediately (Okay, I feel that if I am paying for both I
want them both up all the time). The one thing you really want to notice is
the dialer-group 1 command. That number must match the dialer-list
number. The hold-queue 75 in command tells the router that when it
receives an interesting packet, it should queue up to 75 packets while it is
waiting for the BRI to come up. If there are more than 75 packets queued
before the link comes up, the packets will be dropped.
There are two other commands that you should configure on your BRI interface:
the dialer load-threshold command and the dialer idletimeout
command.
The dialer load-threshold command tells the BRI interface when to
bring up the second B channel. The option is from 1–255, where 255 tells the
BRI to bring up the second B channel only when the first channel is 100 percent
loaded. The second option for that command is in, out, or either. This
calculates the actual load on the interface either on outbound traffic,
inbound traffic, or combined. The default is outbound.
The dialer idle-timeout command specifies the number of seconds
before a call is disconnected after the last interesting traffic is sent. The
default is 120 seconds.
RouterA(config-if)#dialer load-threshold 125 either
RouterA(config-if)#dialer idle-timeout 180
The dialer load-threshold 125 tells the BRI interface to bring up the
second B channel if either the inbound or outbound traffic load is 50 percent.
The dialer idle-timeout 180 changes the default disconnect time from
120 to 180 seconds.