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The IP addresses to be recorded for a specified number of routers that
the packets traverse.
The time that a packet traverses a router to be recorded for a specified
number of routers.
An interface type and specifier of a destination address on the router
that is connected for external loopback by means of a cable or plug that
loops Tx to Rx. The command succeeds only if the specified interface
is connected for external loopback and the encapsulation type is ATM,
Frame Relay, HDLC, or PPP. The command does not work for Ethernet
or VLAN encapsulations.
The traffic class value to match in the Traffic Class field of each packet
(IPv6 only)
The flow label value to match in the Flow Label field of each packet (IPv6
only)
sweep-interval Specifies the change in the size of subsequent ping packets
while sweeping across a range of sizes. For example, you can configure the
sweep interval to sweep across the range of packets from 100 bytes to 1000
bytes in increments equal to the sweep interval. By default the router
increments packets by one byte; for example, it sends 100, 101, 102, 103,
... 1000. If the sweep interval is 5, the router sends 100, 105, 110, 115, ...
1000.
sweep-sizes Enables you to vary the sizes of the echo packets being sent.
This capability is useful for determining the minimum sizes of the MTUs
configured on the nodes along the path to the destination address.
Determining the minimum size reduces packet fragmentation, which
contributes to performance problems. The default is not to sweep (all packets
are the same size).
timeout Sets the number of seconds to wait for an ICMP echo reply packet
before the connection attempt times out.
ttl Sets the time-to-live hop count in the range 1–255; the default is 32.
The following characters can appear in the display after issuing the ping
command:
! Reply received
. Timed out while waiting for a reply
? Unknown packet type
A Address mask request message
a Address mask reply message
D Router discovery advertisement message
d Router discovery request message
H Host unreachable
Chapter 1: Configuring IP
Reachability Commands
63
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