Panasonic NN46240-710 User Manual
Page 63
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Nortel Secure Router 8000 Series
Troubleshooting - VPN___________
2 GRE troubleshooting
# Tunnel configuration on Nortel 1
[Nortel1-Tunnel1/0/0] display this
#
interface Tunnel1/0/0
ip address 30.1.1.1 255.255.255.0
source 100.1.1.1
destination 100.2.1.2
#
return
# Tunnel configuration on Nortel 2
[Nortel2-Tunnel1/0/0] display this
#
interface Tunnel1/0/0
ip address 30.1.1.2 255.255.255.0
source 100.2.1.2
destination 100.1.1.1
#
return
If the display shows that both ends reverse the source address and the destination address, then
run the display this interface command in the tunnel interface view. Go to the next step, if you
find that Line protocol current state is down; it indicates that the tunnel status is down.
Step 3 Check that reachable routes exist between the tunnel source and destination addresses.
If the tunnel interface configuration at both ends is correct, but the status of the tunnel is still
down, check for reachable routes between the source and destination interfaces of the tunnel.
•
If the two interfaces do not directly connect, check for the route to the remote tunnel
interface on each interface.
•
If the two interfaces directly connect, no problem exists with routes.
Use the display ip routing-table command to check the routing table. If the table is correct, use
the display fib command to view the Forwarding Information Base (FIB) table to see whether
the data is forwarded correctly. The FIB must be consistent with the routing table.
Use Nortel 1 and Nortel 2 shown in Figure 2-3 as an example.
The output of the display fib command on Nortel 1 is as follows:
FIB Table:
Total number
of Routes
10
Destination/Mask
Nexthop
Flag TimeStamp
Interface
Token
127.0.0.1/32
127. 0.0 .1
HU
t[ 0]
InLoop0
0x0
127.0.0.0/8
127. 0.0 .1
U
t[ 0]
InLoop0
0x0
100.1.1.1/32
127. 0.0 .1
HU
t[ 0]
InLoop0
0x0
100.1.1.0/24
100. 1.1 .1
U
t[ 0]
Pos1/0/0
0x0
10.1.1.2/32
127. 0.0 .1
HU
t[ 0]
InLoop0
0x0
10.1.1.0/24
10.1 .1.2
U
t[ 0]
Pos2/0/0
0x0
30.1.1.1/32
127. 0.0 .1
HU
t[ 0]
InLoop0
0x0
30.1.1.0/24
30.1 .1.1
U
t[ 0]
Tun1/0/0
0x0
The display of
Nortel 2
is as follows:
FIB Table:
Total number
of Routes
10
Destination/Mask
Nexthop
Flag TimeStamp
Interface
Token
Issue 5.3 (30 March 2009)
Nortel Networks Inc.
2-9