System information

Troubleshooting IBM 10-245
CIP: Router Cannot ping Host or Host Cannot ping Router
CIP: Router Cannot ping Host or Host Cannot ping Router
Symptom: Attempts to ping are unsuccessful, either from the CIP card in a router to a host or from
a host to the CIP card in a router.
Table 10-16 outlines the problem that might cause this symptom and describes solutions to that
problem.
Table 10-16 CIP: Router Cannot ping Host or Host Cannot ping Router
Possible Problem Solution
CHPID
1
not
online to host
1 CHPID = channel path identifier
Step 1
Make sure the Enabled LED on the CIP card is on. If it is not on, refer to the
section “CIP: No Enabled LED On” earlier in this chapter.
Step 2 Use the show extended channel slot/port subchannel command and check for the
SIGNAL flag in the output.
Step 3 If the SIGNAL flag is not present, check whether the CHPID is online to the host.
If it is not, configure it to come online.
Note: On a bus and tag channel, the SIGNAL flag is turned on by OP_OUT being
high from the host. On an ESCON channel, the SIGNAL flag is turned on by the
presence of light on the channel.
Step 4 If the CHPID does not come online to the host, check the physical cabling.
Step 5 If the CIP still does not come online, check the IOCP
2
definitions for the CIP
device, and check the router configuration.
2 IOCP = input/output control program
Possible Problem Solution
Addressing problem
between CIP and host
Step 1 Verify that the CLAW connection is up by checking the output of the show
extended channel slot/port statistics exec command on the router.
Step 2 If the output shows that CLAW connections are not up (indicated by a N), refer
to the section “CIP: CLAW Connection Does Not Come Up” earlier in this
chapter.
Step 3 If the CLAW connections are up (indicated by a Y), issue the clear counters
privileged exec command. Then attempt a basic ping to the host from the router
or to the router from the host.
Step 4 When the ping is completed, use the show extended channel slot/port
statistics exec command on the router.
If you issued the ping from the router to the host, the host should have read
five 100-byte ICMP echos from the router. The Total Blocks field in the show
command output should indicate five blocks read. If the host replied, the output
should indicate five blocks written.
If you issued the ping from the host to the router, the host should have sent one
276-byte ICMP echo to the router. The Write field should indicate one block
written. If the router replied, the output should indicate one block in the Read
field.
Step 5 If this is not the case, there could be an addressing problem between the CIP
and the host. Check all IP addresses on the router and in the host TCP/IP profile
and make sure they are correct.