Nortel Meridian 1 Description, Installation And Operation page 66

Page 66 of 262 IP Telecommuter Engineering Guidelines
553-3001-119 Standard 2.00 April 2000
68 bytes from (10.3.2.7): icmp_seq=0 ttl=225
time=94ms
68 bytes from (10.3.2.7): icmp_seq=0 ttl=225
time=112ms
68 bytes from (10.3.2.7): icmp_seq=0 ttl=225
time=97ms
^?
--- ITG_Node1 PING Statistics ---
8 packets transmitted, 8 packets received, 0% packet
loss
round-trip (ms) min/avg/max = 94/96/112
The round trip time ( rtt ) is indicated by the time
field.
In order that the delay sample results match what the ITG_node1 would
experience, the ping host should be on a healthy LAN segment attached to
the router intended to support the IP Line card node. The choice of destination
host is just as crucial, following these same guidelines for the source host.
The size of the ping probe packets can be any numbers, the default is 60
bytes.
Notice from the ping output the variation of rtt. It is from repeated sampling
of rtt that a delay characteristic of the intranet can be obtained. In order to
obtain a delay distribution, the ping tool can be embedded in a script which
controls the frequency of the ping probes, timestamps and stores the
samples in a raw data file. The file can then be analyzed later using
spreadsheet and other statistics packages. The technician can also check
whether the intranet's network management software has any delay
measurement modules which can obtain a delay distribution for a specific
route.