Привет всем!
Настраиваю Dial Backup на cisco 2811, к которой на serial 0/0/0 прицеплен модем Zyxel U336. Вынимаю кабель из FastEthernet 0/0 (основной канал), на терминал сыпется:

%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down
%LINK-3-UPDOWN: Interface Serial0/0/0, changed state to down
Se0/0/0 DDR: re-enable timeout

и на этом все, модем никуда не звонит.
Вот конфиг:
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
!
hostname cisco2811
!
boot-start-marker
boot system flash c2800nm-ipbase-mz.124-3h.bin
boot-end-marker
!
enable secret 5 $1$ca6m$01Qf7rB9/26zdmn9v2Bvk1
enable password 7 050F0016354F4D0F
!
no aaa new-model
!
resource policy
!
ip subnet-zero
no ip routing
!
!
no ip cef
!
!
no ip domain lookup
!
chat-script dial ABORT ERROR ABORT BUSY "" AT OK "ATDT\T" TIMEOUT 30 CONNECT
modemcap entry zyxel336:MSC=Z4S0=1
username hop password 7 03510F58545E
!
!
!
interface FastEthernet0/0
backup delay 10 30
backup interface Serial0/0/0
ip address 192.168.9.1 255.255.255.0
no ip route-cache
duplex full
speed auto
no mop enabled
!
interface FastEthernet0/1
no ip address
no ip route-cache
shutdown
duplex auto
speed auto
!
interface Serial0/0/0
physical-layer async
no ip address
encapsulation ppp
dialer in-band
dialer string 07141074
dialer-group 1
async mode interactive
no peer default ip address
ppp authentication pap
ppp pap sent-username test password 7 055A545C7519
!
interface Dialer0
no ip address
!
ip local pool test 192.168.9.50 192.168.9.55
ip classless
no ip forward-protocol nd
!
no ip http server
!
dialer-list 1 protocol ip permit
!
control-plane
!
!
line con 0
line aux 0
line 0/0/0
script dialer dial
modem InOut
modem autoconfigure type zyxel336
transport input all
autoselect ppp
stopbits 1
speed 115200
flowcontrol hardware
line vty 0 4
password 7 050F0016354F4D0F
login
!
scheduler allocate 20000 1000
!
end