DDR设置步骤

admin

　　1.设置静态路由
　　RouterA(config)#ip route 172.16.50.0 255.255.255.0 172.16.60.2
　　RouterA(config)#ip route 172.16.60.2 255.255.255.255 bri0
　　
　　2.设置Interesting Traffic
　　804A(config)#dialer-list 1 protocol ip permit
　　804A(config)#int bri0
　　804A(config-if)#dialer-group 1
　　
　　3.配置Dialer信息
　　804A#config t
　　804A(config)#int bri0
　　804A(config-if)#ip address 172.16.60.1 255.255.255.0
　　804A(config-if)#no shut
　　804A(config-if)#encapsulation ppp
　　804A(config-if)#dialer-group 1
　　804A(config-if)#dialer-string 8350661
　　或者用804A(config-if)#dialer map ip 172.16.60.2 name 804B 8350661
　　代替dialer-string
　　
　　sh run
　　804B#sh run
　　Building configuration...
　　Current configuration:
　　!
　　version 12.0
　　no service pad
　　service timestamps debug uptime
　　service timestamps log uptime
　　no service password-encryption
　　!
　　hostname 804B
　　!
　　ip subnet-zero
　　!
　　isdn switch-type basic-ni
　　!
　　interface Ethernet0
　　ip address 172.16.50.10 255.255.255.0
　　no ip directed-broadcast
　　!
　　interface BRI0
　　ip address 172.16.60.2 255.255.255.0
　　no ip directed-broadcast
　　encapsulation ppp
　　dialer idle-timeout 300
　　dialer string 8358661
　　dialer load-threshold 2 either
　　dialer-group 1
　　isdn switch-type basic-ni
　　isdn spid1 0835866201 8358662
　　isdn spid2 0835866401 8358664
　　hold-queue 75 in
　　!
　　ip classless
　　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
　　!
　　可选参数
　　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 on outbound traffic, inbound traffic,
　　or on the two 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.
　　Multilink PPP (MP) allows load balancing between the two B channels in
　　a BRI. It is non-vendor specific, and provides packet fragmentation and reassembly,
　　sequencing, and load calculating. Cisco’s MP is based on RFC 1990.
　　The configuration would then look like this:
　　RouterA(config-if)#dialer load-threshold 125 either
　　RouterA(config-if)#dialer idle-timeout 180
　　RouterA(config-if)#ppp multilink
　　Not a tough configuration, but you want to use it nonetheless. This command
　　will fragment packets and send them over both lines, which provides
　　a load balancing effect of the data packet. You can verify the multilink is
　　working with the show ppp multilink command.
　　
　　2个B信道
　　如果要同时激活2条B信道，可以使用
　　dialer load-threshold 1
　　也就是说把流量负载的值设到最小就可以了