I need to integrate a ISDN-backup Solution for an existing DSL Connection.
The DSL-Conection is done by using a Dialer with IP address negotiated but I always get the same one (static). Now I want to backup the case if the DSL-Connection seems to work but no IP could be transfered (Cause very seldom i get a link down at the ATM interface!!). So I need to set up a function which checks if IP works and if not it has to start a Dial-Out ISDN connection. For this connection I even could define that I get the same address negotiated like for the DSL-Connection (if it make sense!!) Any idea?? many thanks in advance. Matt
try Enhanced Object Tracking, which checks the reachability of the remote next hop address, and, if that address is not reachable, considers the primary connection down. Your configuration would look something like this (the IP addresses in this example obviously are arbitrary):
no ip address
pppoe-client dial-pool-number 1
ip address 192.168.1.1 255.255.255.252
type echo protocol ipIcmpEcho 220.127.116.11
rtr schedule 1 life forever start-time now
track 123 rtr 1 reachability
access list 101 permit icmp any host 18.104.22.168 echo
route map MY_LOCAL_POLICY permit 10
match ip address 101
set interface null 0
ip local policy route-map MY_LOCAL_POLICY
ip route 0.0.0.0 0.0.0.0 22.214.171.124 track 123
ip route 0.0.0.0 0.0.0.0 192.168.1.2 254
In newer IOS versions (that is,12.4), the 'rtr' command has been replaced by the 'sla' command, but the functionality is the same.
There are also other parameters you can track. Have a look at the documents below:
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