06-07-2003 05:23 AM - edited 03-02-2019 07:57 AM
I have 3662 central router and 150 branched on FR links HUB and spoke config.
branche routers will only have default route to the HO router.
Requirement:
I need PSTN dial ackup for the FR link.
Also, I need the dial backup link to be kept activated irrespective of the interesting traffic. I need the backup linkto stay up untill primary FR link comes back.
I am trying with dialer-watch to watch the default route. I also defined a static default route with higher ad. distance to router traffice in the dial-back scenario.
This method has two problems.
1. Once the primary ois down, backup link is activated, but after short duration, the line is reset and re-dials.
2. If the primary link is down when the router powered- on. Then the routing table has static default route, hence router wil never dials to initiate the connection.
What is the best method to achieve the requirements ?
06-07-2003 05:51 PM
The dialer-watch method should work fine with your requirements. We need to know what the PSTN links (analog or isdn) went down and re-dials. "debug dialer" will show us the reason for that.
Dialer-watch should not keep the pstn link up regardless of inetresting traffic and even if the idle-timeout expires. It will only bring down the backup link is the watched route learned via primary link.
visit following link for more
http://www.cisco.com/warp/public/123/backup-main.html#dwatch
Now, 2nd point, the backup link should be activated regardless of default route as dialer-watch works on watched routes. So we need to debug that issue.
Here is the link which compares all the backup methods
06-08-2003 04:10 AM
For the second point, what I Learned is , when I define the router to be watched is the defalut route ( 0.0.0.0/ 0.0.0.0 ) and do not want to run routing prorocol over the backup link I have the following defalut rotute defind;
ip route 0.0.0.0 0.0.0.0 172.16.50.2 150
When the router powers up, if the promary link is down, when I query teh route table I can see the floating static defalut route has been installed irrespective of the backup link UP/DOWN as follows;
172.16.0.0/16 is variably subnetted, 3 subnets, 2 masks
C 172.16.150.0/24 is directly connected, FastEthernet0
C 172.16.200.0/30 is directly connected, Loopback1
C 172.16.50.0/30 is directly connected, Async5
S* 0.0.0.0/0 [150/0] via 172.16.50.2
Therefore , I bilieve that the router "thinks" that the route to be watched, now via the static route , as the PRIMARY link.
Since dialer watch assumes that the "PRIMARY" link is UP, it is never going to dial.
Any thoughts ?
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