| Author |
Floating static route
|
|
| wirelessboy 2003-04-12, 10:38 pm |
| hai everyone
i have a primary interface as ethernet, connected to a radio modem, and ISDN as backup.
should i use a floating static or a back-up interface command, whats the difference in this case.
will a line protocol down, immd trigger the floating static route to work, or should the interface too should go down.
regards | |
| Yankee 2003-04-13, 4:05 am |
| Floating statics don't watch state changes on interfaces. They watch and replace a route that disappears. Mine replace my default network in the event of a frame-relay failure and trigger an ISDN backup call. CCO has many great examples of ISDN backup schemes.
Yankee | |
| wirelessboy 2003-04-13, 10:42 pm |
| yes yankee
thats where i am confused, when does a route actually dissapear in a routing table int the following cases.
1. when we use static routes
2. when we use dynamic routing protocols
thanks | |
| Yankee 2003-04-14, 3:07 am |
| I use it with EIGRP and the default network command. When the default network goes away (because my frame connection dropped) the floating static weighted 91 takes it place and up comes the ISDN call. Do a search on CCO for ISDN cookbook. That will explain it for you better than I can at 0400 
Yankee | |
| anchor40 2003-04-14, 10:34 pm |
| Yankee nailed it with the "interface will state-change" point - the B/U int will trigger off the state change immediately - the floating static will wait for the route to get flushed before getting inserted into the routing table.
We use the Floating Static approach for DDR on a VPN pilot of 100 sites and it works great - we can afford the 2 minutes of downtime before the VPN is restored over the modem-to-ISP dial-up session (30sec for route to expire, 1min 30sec to restor tunnel).
HTH... | |
| peterd 2003-04-15, 2:22 am |
| Hi Guys,
another point is how many routes are you backing up..
if it's only one then you can use the 'back up' style but if it's more than one then you need to use the 'floating' method.
Setting a BRI as back-up to a serial link will tie it down and it won't be available for any other calls in or out.
Regards
Peter | |
|
| quote:
Originally posted by peterd
Setting a BRI as back-up to a serial link will tie it down and it won't be available for any other calls in or out.
Dialer profiles would overcome this limitation.
http://makeashorterlink.com/?V23F51634 | |
| peterd 2003-04-17, 2:22 am |
| hi Mat,
yep, I know I've used them...
but for some reason I have a hell of time making dialer profiles work. I usually copy a known working profile (set up by a super-professional!) making changes on the relevant lines but they never work first time.
I get it working eventually but I've not yet figured how to do it first time.
Floating static does work first time, every time for me...
Regards
Peter |
|
|
|