Backup interface does not work, because it triggers on the line protocol. In this case the line protocol (ethernet connection to the dsl modem) will stay up, even the ppp connection to the remote site is down.
This question has been asked before, except they used the term IPSec or VPN rather than PPPoE for the link requiring backup. With Cisco kit you must use a routing protocol in order to detect when you lose end-to-end connectivity (as has already been stated, the Ethernet interface will never go down short of pulling the cable).
You get to choose between setting up a GRE tunnel and running a routing protocol over that, or using BGP end-to-end. See the answer I just posted for "ISDN backup for IPSec VPN" in this same forum.
thank you for the posting. I knew your answers to previous conversations as well as your homepage. Both are very helpful.
BGP avoids GRE, which makes things quite easy, but I want to avoid any routing protocol.
Normaly, a cisco router running PPP inserts the ip address of its peer as a host route (/32) in its routing table. This address is provided via the PPP LCP negotiation. Therfore, dialer watch might trigger on this host route?
I had not thought of using the PPPoE inserted IP address. That should work if your environment is one where you can accurately and safely predict the address of the peer. You could also use DDR with floating statics, which would also handle the case where there are a finite set of possible peers rather than only one. My experience is that many ISPs will not give any guarantees about what address you will get or be routed to, so use care if you can't control both ends.
The bottom line is I've never tried it--so I can't tell you whether or not dialer watch will work correctly with PPP inserted routes. But aside from the need to predict the IP address of the router assigned when you link up, there is no reason that DDR should not work. Of course anyone who has worked with network implementations long enough knows that just because something theoretically should work does not mean that it will work, so test carefully before committing to the design (and let me know the results!).
Good luck and have fun! And thanks for the encouraging feedback :-)
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.