From: Derek Small (dwsmall@xxxxxxxxxx)
Date: Fri Feb 25 2000 - 09:58:12 GMT-3
The dial scenario would work either way as long as it's a serial interface.
If it's frame you need to test it to see. If the carrier is providing
end-to-end A-bit integrity indications, you can use the backup interface
command on either router. If the carrier does not do end-to-end A-bit, it
will only work from the end that shows down. The since the backup interface
command puts the interface into standby, the only reason it works when you
put it on both ends is because both ends go down, this is also why you only
need it on one end.
You should NEVER use the same subnet on two different interfaces, I've seen
it done for load balanced T1's but cannot even guess why you would want to.
Use a different subnet on every interface on the router, unless you are
bridging. The 50% success rate you are seeing is because, if you look in
your routing table you will see two routes to the same network(s) one route
via the ISDN, the other via the serial link. The router is trying to load
balance. Use a different subnet on the ISDN line and make sure the admin
distance on the floating static is higher than any dynamic routing protocol
you are running.
Derek Small
dwsmall@fatkid.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Khurram Khani
Sent: Friday, February 25, 2000 7:27 PM
To: Manjeet Chawla
Cc: ccielab@groupstudy.com
Subject: Configuring Dial Backup ?
Hi.
R1 ---serial link ----- R2
R1/R2 are provided with ISDN Dial Backup.
Backup Interface Command
---- If I get a scenario to provide backup from R1-->R2 and from R2--->R1 , shall I use "backup interface bri0" in the serial interfaces of both Routers ? infact putting the backup interface command at only side is also sufficient. And I tried putting it on both the sides that also work. Kindly advise.Floating Static Routes ----------------
If I want to use floating static routes to provide DIAL Backup to Serial link, Can I still use the same SUBNET on BRI interfaces as Serial Interfaces? I tried it and I am getting 50% of ping success rate. I believe this is due to the fact that BACKUP interface command puts the BRI interface in standby mode where as if I use static routes still the interface will remain UP
Please advise
TIA KHURRAM KHANI.
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