| Author |
Backup link used only between Mon - Fri
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| genocyber 2004-03-20, 9:55 pm |
| Is there a way to configure a router so that if the primary link fails the secondary link will take over automatically only between Monday and Friday.
What I mean is if the primary link fails which might be a frame relay or ADSL connection then on the weekend the backup link which might be an ISDN link will not be dialled.
I have not heard of this before but I asked because my company was talking about having this configuration to save money so the secondary connection won’t be used on weekends when no one should be in the office. | |
| smrkdown 2004-03-20, 11:23 pm |
| Couldn't you create a time range and use it in an access list and then use that access list to specify "interesting traffic" for the backup link? The traffic will only match the dialer list conditions during the time you specify. | |
| Yankee 2004-03-21, 3:31 pm |
| A am not aware of away to do exactly that, but you could take the automation out of the DDR and make the interesting traffic such that you have to do a ping to bring up the link or something like that... Problem with that answer is you then need a tech around that knows how to bring the link up if you lose your leased line or frame circuit.
ISDN is not as expensive as it use to be in many areas. Some providers offer an always on price that is affordable, while others say they do but cap it at like 300 hours a month. Either way you aren't likely to exceed those numbers very often.
Yankee | |
| smrkdown 2004-03-21, 3:35 pm |
| It's actually very easy to do what I said but I wasn't sure if that solution was right for his problem. | |
| Yankee 2004-03-22, 5:06 am |
| Had to look it up but Smrkdown is absolutely right. Right from CCO:
access-list 101 remark ACL for Async interesting traffic definition
access-list 101 permit ip any host 255.255.255.255 time-range only-during-open-hours
access-list 101 deny ip any host 255.255.255.255
access-list 101 permit ip any any
!
time-range only-during-open-hours
absolute start 00:00 01 January 2001
periodic weekdays 7:30 to 18:30
periodic Saturday 8:30 to 13:30
periodic Sunday 8:30 to 18:30
Do search for "Time-Based ISDN/Async (Legacy) DDR" on Cisco
http://www.cisco.com/en/US/customer...080094089.shtml
Thanks Smrkdown
Yankee | |
| genocyber 2004-03-22, 5:36 am |
| Thanks all for the help.
I didn't know that you could specify an access control list based on the day of the week. I will look into this further. | |
| smrkdown 2004-03-22, 10:15 am |
| Yup, I found it while going over access-list in an older book "Cisco IOS IP Field Guide". |
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