Cisco Catalyst 2000 Configuration Handbook page 238

■ P: Protocol unreachable message was received.
■ N: Network unreachable message was received.
■ ?: An unknown packet type was received.
■ Q: Source quench was received.
The traceroute probes continue to be sent until the maximum TTL value (30 by
default for IP) is exceeded or until you interrupt the router with the escape sequence
(Ctrl-Shift-6).
You can also invoke traceroute with no options. This enables the switch to prompt
for the parameters from the following list:
■ Protocol (default IP).
■ Target address.
■ Source address: An IP address of a router interface; if not specified, the
interface closest to the destination is used.
Numeric display (default no): By default, both the hostname and IP address
■
of each hop display; if set to yes, only the IP addresses display. This is handy
if DNS is not available.
■ Timeout in seconds (default 3): The amount of time to wait for a response to
a probe.
Probe count (default 3): The number of probes to send to each TTL (or hop)
■
level.
Minimum TTL (default 1): The default of one hop can be overridden to
■
begin past the known router hops.
Maximum TTL (default 30): The maximum number of hops to trace; tracer-
■
oute ends when this number of hops or the destination is reached.
■ Port number (default 33434): The UDP destination port for probes.
■ Loose, strict, record, timestamp, verbose (default none): loose (loose
source route with hop addresses), strict (strict source route with hop
addresses), record (record the route with a specified number of hops),
timestamp (record time stamps at each router hop), and verbose (toggle ver-
bose reporting). The record option can be useful to see a record of the
router addresses traversed over the round-trip path.
Note Some routers do not respond to traceroute probes correctly. In this case, some or
all the probes sent are reported with asterisks (*) in the display.
(Optional) Use Layer 2 traceroute to discover switches along a path:
3.
Switch# traceroute mac
Chapter 12: Switch Management 217