HP E4510-48G Command Reference Manual page 1244

By default, the maximum number of hops that a probe packet can traverse in a network is 20.
Note that after you configure the route-option bypass-route command, the maximum number of hops
a probe packet traverses in the network is 1, and the ttl command does not take effect.
Examples
# Configure the maximum number of hops that a probe request can traverse in a network as 16.
<Sysname> system-view
[Sysname] nqa entry admin test
[Sysname-nqa-admin-test] type icmp-echo
[Sysname-nqa-admin-test-icmp-echo] ttl 16
type
Syntax
type { dhcp | dlsw | ftp | http | icmp-echo | snmp | tcp | udp-echo | udp-jitter | voice }
View
NQA test group view
Default Level
2: System level
Parameters
dhcp: DHCP test.
dlsw: DLSw test.
ftp: FTP test.
http: HTTP test.
icmp-echo: ICMP echo test.
snmp: SNMP test.
tcp: TCP test.
udp-echo: UDP echo test.
udp-jitter: UDP jitter test.
voice: Voice test.
Description
Use the type command to configure the test type of the current test group and enter test type view.
By default, no test type is configured.
Examples
# Configure the test type of a test group as FTP and enter test type view.
<Sysname> system-view
[Sysname] nqa entry admin test
[Sysname-nqa-admin-test] type ftp
[Sysname-nqa-admin-test-ftp]
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