[cisco-nas] question regarding TRACK PPPoE/cellular failover

[Steger, Christian]

hi gert,

thanks for your reply.

* >
* > if a route or if a device on dialer1 is reachable "clear the
cellular
* > interface" or something else..
* > just remember i would like to have a persistant connection on both
* > dialer interfaces (PPPoE as well as Cell)
* 
* This is exactly what you can do with "ip sla" and "track".
* 
* "ip sla" will figure out whether or not "a device on dialer1 is
* reachable"
* 
* "track" will move your default (or more specific) routes around
* according to whatever you want to achieve.

yes, you are right, but remember i use on both interfaces the statement 
"dialer persistent" (nailed-up) - means, of course he swap in fact of
the "ip sla"
the "reachable" interfaces and use according that the tracking
"route"...
my problem is, actually a "worest case":
if you have an "routing issue" on the access-layer level (to the core)
and your cellular route
wins always, means the routing way is assymetric -> from point of view
the CPE the primary
interface the defaultroute pointing to the primary interface.. (in case
of an normal operation of course!)
on the point of view in the backbone the traffic routes back on the
cellular interface. (because it has
an smaller distance - different routing protocols as example)

and again this is just an worest case scenario i try to avoid such
issues and play a bit with it in the lab.
what i am looking for is something like "backup interface dialer2" but
its of course not an solution
in fact that i cannot use it on the dialer1 (and my PPPoE interface is
an FastEthernet so it would be
much stupid to use this statement here :))

hope you understand what my actual "solutionrequest" is.

chris

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