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Posted by karlutxo on October 3, 2005, 6:15 am
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We have two cisco 837 routers (R1 & R2) located at our main office.
Another cisco 837 router (EA) is located at remote office.
There are two tunnel interface configured. tunnel1 connects R1 and EA
routers. Tunnel2
connects R2 and EA routers.
Static route table is configurate as follow:
In R1: ip route 192.9.109.0 255.255.255.0 Tunnel1
In R2: ip route 192.9.109.0 255.255.255.0 Tunnel2
(Where 192.9.109.0 is remote office network address)
In EA: ip route 192.9.200.0 255.255.255.0 Tunnel1
ip route 192.9.200.0 255.255.255.0 Tunnel2 5
(Where 192.9.200.0 is main office network address)
Usually everything works right. Both tunnels are up and we can connect
to EA
throught either R1 or R2.
Problems begins when adsl connections at R1 fail. We think EA must
detect that tunnel1
is down and route trafic over Tunnel2, but EA didnīt route over
tunnel2 until we manually
shutdown tunnel1.
Can you help me about this?
Regards
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Posted by Walter Roberson on October 3, 2005, 2:12 pm
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:We have two cisco 837 routers (R1 & R2) located at our main office.
:Another cisco 837 router (EA) is located at remote office.
:There are two tunnel interface configured. tunnel1 connects R1 and EA
:routers. Tunnel2
:connects R2 and EA routers.
:Usually everything works right. Both tunnels are up and we can connect
:to EA
:throught either R1 or R2.
:Problems begins when adsl connections at R1 fail. We think EA must
:detect that tunnel1
:is down and route trafic over Tunnel2, but EA didn=B4t route over
:tunnel2 until we manually
:shutdown tunnel1.
That's a problem. As far as the routers are concerned, GRE tunnels
are -always- up (unless maybe you turn on GRE keyalives.)
Please have a look at Vincent C. Jones' web site for information
on the sorts of things you have to do in order to have tunnel
state track interface or connection state.
According to what I've read (and experienced a bit myself),
it is fairly common for ADSL links to go down "one hop away",
leaving the local interface physically up and able to send packets
but the packets are not getting anywhere useful. This requires
that you use an end-to-end checking strategy rather than relying
on the router detecting a hardware link down.
--
"It is important to remember that when it comes to law, computers
never make copies, only human beings make copies. Computers are given
commands, not permission. Only people can be given permission."
-- Brad Templeton
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