Brocade Multi-Service IronWare Administration Guide (Supporting R05.6.00) - Manual (Page 220)

202 Multi-Service IronWare Administration Guide
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Trace route
6
Trace route
The trace route tool works by sending ICMP echo packets with varying IP Time-to-Live (TTL) values
to the destination.
You can use IP traceroute to identify the path that packets take through the network on a
hop-by-hop basis. The command output displays all network layer devices, such as routers, through
which the traffic passes on its way to the destination.
The device can execute simultaneous traceroute commands from multiple inbound telnet or SSH
sessions. Multiple simultaneous traceroutes from Web and SNMP, however are not allowed. The
device can also resolve multiple DNS queries simultaneously, which allows multiple traceroute
commands with the hostname option to be executed at the same time.
NOTE
Traceroute commands in outbound telnet sessions run on the remote telnet server and not on the
local device.
Executing traceroute
The traceroute command, in the (Enable) mode, displays the routing path from the routing switch to
the destination IP address as soon as the information is received. Traceroute requests display all
responses to a given TTL. In addition, if there are multiple equal-cost routes to the destination, the
device displays up to three responses by default.
NOTE
When executed in IPv4, the traceroute command does not display the IP address of the GRE tunnel
interface path.
Example
Brocade> traceroute 10.33.4.7 minttl 5 maxttl 5 timeout 5
Syntax: traceroute host-ip-addr [maxttl value] [minttl value] [numeric] [timeout value] [source-ip
ip addr]
The maxttl value parameter is the maximum TTL (hops) value: Possible value is 1 – 255. The
default is 30 seconds.
The minttl value parameter is the minimum TTL (hops) value: Possible value is 1 – 255. The default
is 1 second.
The numeric parameter lets you change the display to list devices by IP address instead of by
name.
The timeout value parameter specifies the possible values. Possible value range is 1 – 120.
Default value is 2 seconds.
The source-ip ip addr parameter specifies an IP address to be used as the origin for the traceroute.
Executing traceroute VRF
In the (Enable) mode, the traceroute vrf command functions like the standard traceroute command
but requires you to specify a VRF table name. The traceroute vrf command must be used when the
route to the destination is associated with a VRF table.