Qtech QSW-3300-28F-AC-AC [222/693] System utility and clear commands

Qtech QSW-3300-28F-AC-AC [222/693] System utility and clear commands
System Utility and Clear Commands
Software User Manual
CLI Command Reference
Page 239
System Utility and Clear Commands
This section describes the commands you use to help troubleshoot connectivity issues and to restore various
configurations to their factory defaults.
traceroute
Use the traceroute command to discover the routes that IPv4 or IPv6 packets actually take when traveling to
their destination through the network on a hop-by-hop basis. Traceroute continues to provide a synchronous
response when initiated from the CLI.
The user may specify the source IP address of the traceroute probes. Recall that traceroute works by sending
packets that are expected not to reach their final destination, but instead trigger ICMP error messages back to
the source address from each hop along the forward path to the destination. By specifying the source address,
the user can determine where along the forward path there is no route back to the source address. Note that
this is only useful if the route from source to destination and destination to source is symmetric.) It would be
common, for example, to send a traceroute from an edge router to a target higher in the network using a source
address from a host subnet on the edge router. This would test reachability from within the network back to hosts
attached to the edge router. Alternatively, one might send a traceroute with an address on a loopback interface
as a source to test reachability back to the loopback interface address.
In the CLI, the user may specify the source as an IPv4 address, IPv6 address, or as a routing interface. When
the source is specified as a routing interface, the traceroute is sent using the primary IPv4 address on the source
interface. With SNMP, the source must be specified as an address. The source cannot be specified in the web
UI.
Switch will not accept an incoming packet, such as a traceroute response, that arrives on a routing interface if
the packet’s destination address is on one of the out-of-band management interfaces (service port or network
port). Similarly, Switch will not accept a packet that arrives on a management interface if the packet’s
destination is an address on a routing interface. Thus, it would be futile to send a traceroute on a
management interface using a routing interface address as source, or to send a traceroute on a routing interface
using a management interface as source. When sending a traceroute on a routing interface, the source must
be that routing interface or another routing interface. When sending a traceroute on a management interface,
the source must be on that management interface. For this reason, the user cannot specify the source as a
management interface or management interface address. When sending a traceroute on a management
interface, the user should not specify a source address, but instead let the system select the source address
from the outgoing interface.
Default count: 3 probes
interval: 3 seconds
size: 0 bytes
port: 33434
maxTtl: 30 hops
maxFail: 5 probes
initTtl: 1 hop

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