12-04-2008 12:37 AM - edited 03-04-2019 12:35 AM
I want to configure ISDN link as backup of my MPLS link with loadbalancing .Senerio is like this if my MPLS link utilization will exceded then 80% of MPLS link capacity , some traffice will auto matically diverted through ISDN.
Any one help me.
12-04-2008 12:53 AM
Hello Sujeet,
ISDN access to an MPLS VPN is possible using a feature called dialer map VRF aware:
the PE ISDN is able to answer calls from CE not to call.
on receiving the call the PE can associate the call with the right VRF.
Some attributes can be stored on the Radius server and downloaded during ppp authentication of the CE router
see
http://www.cisco.com/en/US/docs/ios/12_2t/12_2t8/feature/guide/ftmapvrf.html
I tested it some years ago and it worked
Hope to help
Giuseppe
12-04-2008 01:59 AM
Dear Giuseppe,
Thanks for reply,
Can we use ISDN link as a loadbalance link if my primary MPLS link utilization is over 80%. or can we use here ISDN as a load shareing link with MPLs primary link .
Regards,
Sujeet
12-04-2008 03:02 AM
Hello Sujeet,
in my tests I used it only as backup in case of primary link failure.
Using it when MPLS link utilization is over 80% appears possible using the backup load command options
the isdn link is defined as the backup of the primary (they must be on the same CE router)
However, verify if you have a flat rate ISDN fee otherwise it is better to use it only for backup.
backup load
http://www.cisco.com/en/US/docs/ios/dial/command/reference/dia_a1.html#wp1012248
Hope to help
Giuseppe
12-05-2008 01:37 AM
Dear All,
Senerio is like this,
I got MPLS link and ISDN link both are from single ISP and these links are also terminated on one cisco 1800 router .Right now ISDN as a backup is working but loadsharing is not hsappening .
Thanks for reply .
Regards,
Sujeet
12-05-2008 02:02 PM
Hello Sujeet,
if you like you can post part of your configuration of your 1800 router.
Just mask public ip addresses and removes passwords
To trigger the ISDN link you could try to use backup load 1
However, if ISDN is not flat rate using it as a backup only is the best choice.
traffic inbound is decided by service provider it is highly probable that the ISDN link is terminated on another PE router to provide node fault tolerance but the SP routing will prefer the path via the normal link because the service is thought for backup.
Hope to help
Giuseppe
12-08-2008 01:06 AM
Dear Giuslar,
Thanks for help.
Cheers,
Regards,
sujeet
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