C-77
Troubleshooting
Diagnostic Tools
A Low Maxttl Causes Traceroute To Halt Before Reaching the
Destination Address.
For example, executing
traceroute
with its default
values for a destination IP address that is four hops away produces a result
similar to this:
Figure C-25. Example of a Completed Traceroute Enquiry
Continuing from the previous example (Figure C-25, above), executing
traceroute
with an insufficient
maxttl
for the actual hop count produces an
output similar to this:
[maxttl < 1-255 >]
For the current instance of
traceroute
, changes the maximum
number of hops allowed for each probe packet sent along the
route. If the destination address is further from the switch
than
maxttl
allows, then
traceroute
lists the IP addresses for
all hops it detects up to the
maxttl
limit. For any instance of
traceroute,
if you want a
maxttl
value other than the default,
you must specify that value. (Default: 30)
[timeout < 1-120 >]
For the current instance of
traceroute
, changes the timeout
period the switch waits for each probe of a hop in the route.
For any instance of
traceroute,
if you want a
timeout
value
other than the default, you must specify that value. (Default:
5 seconds)
[probes < 1-5 >
For the current instance of
traceroute
, changes the number of
queries the switch sends for each hop in the route. For any
instance of
traceroute,
if you want a
probes
value other than
the default, you must specify that value. (Default: 3)
Intermediate router hops
with the time taken for the
switch to receive
acknowledgement of
each probe reaching each
router.
Destination IP Address
3500-5400-6200-8200-MCG-Jan08-K_13_01.book Page 77 Monday, January 28, 2008 10:04 AM