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Chapter 5
Applying Cisco's Diagnostic Tools
Router_C>ping 172.16.50.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.50.1, timeout is
2 seconds:
.!!!!
Success rate is 80 percent (4/5), round-trip min/avg/max =
1/3/4 ms
Router_C>ping 172.16.50.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.50.1, timeout is
2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max
= 4/4/4 ms
Router_C>
This output means that the routers are not sharing routing information.
Something is causing the routing protocol to fail, but it is not because the
interface is down. Before moving on, let's review our observations and make
sure that the correct path is being followed.
Host Z cannot FTP to Host A.
Host Z cannot ping to Host A.
Host Z cannot traceroute to Host A.
ICMP "destination unreachable" responses were returned from the
FTP request.
Router C does not have a route to the destination network.
Ethernet 0/0 is up and functioning.
There is capability to ping Router B.
Before a problem definition statement can be devised, more information must
be gathered from Router B. Let's Telnet to Router B. Something looks wrong:
Router_C>172.16.50.1
Trying 172.16.50.1 ... Open
User Access Verification
Password:
Router_B(boot)>
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