01-27-2009 09:06 PM - edited 03-04-2019 01:00 AM
Hi all,
I have a router with one leased line, one isdn line, where LL is the primary connection to HO, and isdn line is the backup.
now i have a DR site where in case both LL and ISDN fails to head office, it should diasl out to DR site.
How can i configure second option in the same ISDN on the same router.
Thank you all for in advance for the help.
01-27-2009 10:06 PM
ISDN-PRI or ISDN-BRI? Destination IP/Port the same?
Try this;
interface Dialer0
ip address w.x.y.1 255.255.255.248 << Note: HO should be w.x.y.2/29 and DR should be w.x.y.3/29
encapsulation ppp
dialer pool 1
dialer idle-timeout 600
dialer string HO_Dialer_String
dialer string DR_Dialer_String
dialer-group 1
ppp authentication chap
ppp multilink
!
dialer-list 1 protocol ip list 100
!
access-list 100 permit ip source_ip source_mask destination_ip destination_mask
When LL to HO fails, it will trigger ISDN to dial the first Dialer_String (HO ISDN Number), if it fails it will trigger the second Dialer_String (DR ISDN Number). You decide on the routing (use floating static route).
01-27-2009 11:00 PM
Hi Medan,
I use different IP range in DR site ISDN, even the is it possible.?
thanks,,
01-28-2009 02:03 AM
It is possible (it works for both) that configuration actually I use for ISDN-BRI with HO and DR IP range differs. The remote site of course will/should try to connect to DR site IP Address range when they could not connect to HO IP Address range. Take note that the ISDN Interface of 3 routers should use an IP Addresses in the same broadcast /29. You also have to put the destination IP Address range in the same ACL.
If its ISDN-PRI, the configuration differs a little bit.
01-27-2009 10:19 PM
hi pradeep,
please look into this config,i think this matches your scenario.
pls rate if it helps
Binoy
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