Hello,
We have 4000 router and 5200 router at central office,
2500 routers and 3640 routers at branch office. 4000
and 2500s are connected with frame relay, 5200 and
3640s are connected with ISDN backup. Eigrp is the
only protocol. We have a default route from 4000 and
it got advertised on 2500s and 3640s as AD /170. We
also configure a default route on 3640s with AD /200
so in case frame is down, /200 default route will take
over and then can bring up ISDN.
The problem is sometimes when frame is ok, 3640 router
default route changes to AD /200 and hence brings up
ISDN backup (3640 also serves as RAS server). When I
do "clear ip route", the AD /170 default route will
come back again, then some days later, it'll get
replaced by the AD /200 one.
We use the same IOS on all routers but this only
happened on some branch offices, not all of them. Any
idea what wrong it is?
Thanks in advance.
Jim
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