I've a situation where I've two ISDN call backup using 1 BRI for my branch connection. First, the call will go to a nearest MPLS node, if this is failed, its will call to a second dialer string to my HQ. (there is 2 router at HQ, one connected to MPLS (3800), and second for ISDN and VOIP call(3640)).
The problem occur when everytime the ISDN call to MPLS, everything are OK. Then, when I disconnect the isdn dial to MPLS ( so it will call to HQ ), I can't access HQ.
If at first I call HQ and then MPLS, everything ok. But if I call back HQ after MPLS call, it can't route. From HQ 3800 router, I can see the route keep on searching at MPLS cloud and back to HQ router (looping).
At branch, the routing are to BRI1/0 :-
ip route 188.8.131.52 255.0.0.0 BRI1/0
ip route 184.108.40.206 255.0.0.0 BRI1/0
ip unnumbered Loopback1
dialer string 123456
dialer string 789011
dialer load-threshold 1 either
isdn switch-type basic-net3
ppp authentication chap callin
ppp chap hostname xxxxx
ppp chap password xxxxx
ppp multilink load-threshold 1 either
**Both string configure at int BRI1/0, no int dialer used.
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