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The Local Tunnel Interface Fails to Ping the IP Address of
the Remote Tunnel Interface
The Local Tunnel Interface Fails to Ping the IP Address of
the Remote Tunnel Interface
Fault Description
The local tunnel interface
fails to ping the IP address of the remote tunnel interface.
Procedure
When the network layer protocol of one or
both ends of a tunnel is Down
Check that interfaces on both ends of the tunnel use
the same tunnel encapsulation mode.
Run the display this interface command in the tunnel
interface view on both ends of the tunnel to check whether interfaces
on both ends use the same tunnel encapsulation mode. If Tunnel
protocol/transport GRE/IP is displayed, the tunnel encapsulation
mode is GRE.
If the two interfaces use different tunnel encapsulation modes,
run the tunnel-protocol command in the tunnel interface view to reconfigure the tunnel
encapsulation mode of one interface to be the same as that of the
other interface.
NOTE:
After reconfiguring the tunnel
encapsulation mode, reconfigure the tunnel source and destination
addresses because configurations of the original source and destination
addresses are lost.
If the two interfaces use the same tunnel encapsulation mode,
go to step 2.
Check that an IP address, a tunnel source address (or
interface), and a tunnel destination address are configured for interfaces
on both ends of the tunnel.
Check whether the local tunnel source address (or interface)
is the peer tunnel destination address and the local tunnel destination
address is the peer tunnel source address (or interface). If not,
no tunnel can be established between the two interfaces. A tunnel
source address (or interface) and a tunnel destination address uniquely
identify a tunnel.
Run the display this command
in the tunnel interface view to check the interface configuration.
Ensure that the local tunnel source address (or interface) is the
peer tunnel destination address and the local tunnel destination address
is the peer tunnel source address.
If the tunnel source (or interface) and destination addresses
are incorrect, run the source and destination commands in the tunnel interface
view to reconfigure the tunnel source (or interface) and destination
addresses.
If the tunnel source (or interface) and destination addresses
are correct, go to step 3.
Check that there are reachable routes between the tunnel
source and destination addresses.
If the interface configurations on both ends are correct
but the tunnel status is still Down, check whether there are reachable
routes between interfaces on both ends of the tunnel.
If the tunnel is established between two indirectly connected
interfaces, check whether there are reachable routes between the two
interfaces.
If the tunnel is established between two directly connected
interfaces, a direct route exists.
Run the display ip routing-table command to view
the IP routing table. If the IP routing table is correct, run the display fib command to check the forwarding
table (FIB table) and check whether data is correctly forwarded.
If there is no reachable route between the tunnel source (or interface)
and destination addresses, configure static routes between the tunnel
source and destination addresses or configure a dynamic routing protocol
to calculate reachable routes.
When the network layer protocol of interfaces on both ends
of a tunnel is Up
If the network protocol status of the two
interfaces is Up but they cannot ping each other, check whether their
IP addresses are on the same network segment. If the IP addresses
are on different network segments, configure static routes between
the two devices or configure a dynamic routing protocol to calculate
reachable routes.
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