Analyzing routing failures

Routing problems are the result of outages in a network and there are no alternative routing paths available for recovery. They can also be the result of incorrect configurations in the channel-attached and network-attached routers, as well as incorrect ARP entries, when applicable. PING and Traceroute commands to and from a z/OS® host are useful diagnosis aids for problem determination.

In this topic, unless otherwise specified, the following command terms are used as described in Table 1.

Table 1. NCPROUTE command terms
Term	Description
PING	Refers to z/OS UNIX oping, TSO PING, and the ping commands used on other platforms.
Traceroute	Refers to z/OS UNIX otracert\|traceroute, TSO TRACERTE, and the traceroute commands used on other platforms.
NETSTAT ROUTE	Refers to the z/OS UNIX onetstat -r, TSO NETSTAT ROUTE, and the netstat route commands used on other platforms.
NETSTAT GATE	Refers to the z/OS UNIX onetstat -g and TSO NETSTAT GATE commands. This command is available only on the z/OS platform.
NETSTAT ARP	Refers to the z/OS UNIX onetstat -R ALL, TSO NETSTAT ALL, and the netstat arp commands used on other platforms.

NCPROUTE routing failures are reported when a client is unable to get a positive response to a PING or Traceroute command for a remote host where there are NCPs acting as RIP servers along the routing paths.