[nsp] Wireless LL and ISDN backup II

From: Nick (nick@arc.net.my)
Date: Wed Jun 20 2001 - 04:30:46 EDT


As a follow up on my earlier post on using ISDN BRI to backup the 'wireless'
link on Aironet when it is down.

I am trying to then use GRE tunnels in the configuration between the client
router and the Ethernet port of the Aironet. What I am trying to achieve is
when the 'wireless' access is down, the logical tunnel interface should also
go down, thus bringing up the ISDN BRI backup. But the only method of
bringing the tunnel interface down by by pysically unplugging the ethernet
cable from the aironet radio modem. Has this got to do with the 'tunnel
source Ethernet0' command? Anyway around this?

The 'dialer watch' command cannot be used as it only applies to serial ports
and none to Ethernet.

I am trying not to use an IGP+floating static routes in the configuration -
only as a last resort.

Thanks in advance.

-nick
-----------------------------------------------------------------------

interface Loopback0
 ip address 200.100.200.105 255.255.255.248
!
interface Tunnel0
 backup delay 5 10
 backup interface BRI0
 ip address 200.100.230.18 255.255.255.252
 tunnel source Ethernet0
 tunnel destination 200.100.230.73

//on the access end router:
//
// interface Ethernet0
// ip address 200.100.230.73
// !
// interface Tunnel0
// ip address 200.100.230.17 255.255.255.252
// tunnel source Ethernet0
// tunnel destination 200.100.230.78

!
interface Ethernet0
 ip address 200.100.230.78 255.255.255.248
!
interface BRI0
 ip unnumbered Loopback0
 encapsulation ppp
 dialer idle-timeout 300
 dialer string 1515
 dialer hold-queue 10
 dialer-group 10
 isdn switch-type basic-net3
 ppp pap sent-username aironetbridge password 7 00061B740C750F250E751F
 hold-queue 75 in
!
ip classless
ip route 0.0.0.0 0.0.0.0 Tunnel0
ip route 0.0.0.0 0.0.0.0 BRI0 100
dialer-list 10 protocol ip permit
!



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