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System Utility and Clear Commands
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 or the virtual router 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..
In the CLI, the user may specify the source as an IPv4 address, IPv6 address, a
virtual router, 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.
CN1610 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,
CN1610 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.
Summary of Contents for CN1610
Page 3: ......
Page 31: ...28 Accessing the CLI ...
Page 309: ...306 Remote Monitoring Commands ...
Page 473: ...470 Port Mirroring Commands 100 ...
Page 487: ...484 DHCP L2 Relay Agent Commands Mode Privileged EXEC ...
Page 607: ...604 IPv6 Management Commands ...