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60 SHOW IP ADVERTISE Patch Release Note
Patch 86251-08 for Software Release 2.5.1
C613-10356-00 REV I
After you have configured the ping polling instance, specify a script or scripts
to run when the device becomes unreachable, using the command:
CREATE TRIGGER=trigger-id MODULE=PING EVENT=DEVICEDOWN
POLL=poll-id SCRIPT=filename... [other-options...]
Then specify a script or scripts to run when the device becomes reachable
again, using the command:
CREATE TRIGGER=trigger-id MODULE=PING EVENT=DEVICEUP
POLL=poll-id SCRIPT=filename... [other-options...]
where filename is the name of the script file, and will have a .scp extension.
Finally, enable the polling instance, using the command:
ENABLE PING POLL=poll-id
Ping polling is only available for IP and IPv6 (ICMP and ICMP6 Echo Request and
Reply packets), not for IPX, AppleTalk or OSI.
Enable and Disable ICMP Messages
The Internet Control Message Protocol (ICMP) allows routers to send error and
control messages to other routers or hosts. It provides the communication
between IP software on one system and IP software on another.
This enhancement allows the switch to enable or disable some ICMP messages
when directed by the network manager.
The ICMP messages that are able to be enabled or disabled are:
■ Network unreachable (RFC792 Type 3 Code 0)
■ Host unreachable (RFC792 Type 3 Code 1)
■ ICMP redirect messages (RFC792 Type 5 Code 0, 1, 2, 3)
Network Unreachable
This message indicates that the switch does not know how to reach the
destination network.
Host Unreachable
This message indicates that the switch does not know how to reach the host.
ICMP Redirect
This message is sent to a local host to tell it that its target is located on the same
LAN (no routing is required) or when it detects a host using a non-optimal route
(usually because a link has failed or changed its status)
on a directly connected
router to advise of a better route to a particular destination.
For more information on ICMP, see the IP Chapter in your switch’s Software
Reference manual.