The ISDN backup design as follow:
1) R1 will dial to R2 when leased line between R1-R2 down.
2) The client/hosts at R2 normally initiated the ip connection. R1 host is server.
I had tested the backup, it work but the ISDN connection is not initiate from R1 unless I ping from R1 ro R2 hosts.
If I ping from R2 side of hosts to R1 side of server continuously , the R1 never dial to R2.
I believed the problem is due to R1 end of server do not initiate connection therefore the ISDN cannot be up.
Question is that a way to make ISDN up immediately, when the leased line failed. Even no traffic is initiate from R1 hosts.
ip address 172.31.4.194 255.255.255.252
backup delay 5 60
backup interface BRI0/1/0
ip address 172.31.4.226 255.255.255.252
dialer idle-timeout 180
dialer map ip 172.31.4.225 name M2M-MCCT-R2 broadcast 56280203
dialer load-threshold 50 either
isdn switch-type basic-net3
ppp authentication chap