lanqueryconf.1m (2010 09)

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lanqueryconf(1M) lanqueryconf(1M)
• The LAN interface name (for example, lan0 and lan1).
• The port priority that will be assigned to the port.
• A cost value for the LAN interface preceded by a colon (:) and a space. This is an optional field.
A port with the lowest normalized cost (cost divided by port’s speed) will carry traffic. When ports
have the same normalized cost, the one with the higher priority is preferred.
For each failover group, either all or none of the ports should have the cost values assigned. If none
of the ports has cost value assigned, then the failover group uses the default failover behavior
based on priority. See the "Proactive Failover" section and the HP APA Administrator’s Guide for
more information.
•
POLLING_INTERVAL
The number of microseconds between polling messages. Polling messages are sent between ports in the
specified interval for monitoring the health of all the ports in the failover group. The default is
10000000 (10 seconds). This keyword can be specified multiple times in the configuration file. A fail-
over group’s polling interval is set to the last specified interval.
•
DEAD_COUNT
The number of polling packets that are missed before deciding to send a
nettl log message to the
user that indicates the port might have problems and the network should be checked. The default is 3.
•
LM_RAPID_ARP
Enables (on) or disables (off) the ability to transmit gratuitous ARP messages at intervals shorter than
5 seconds. By default, LM_RAPID_ARP is on.
When the MAC address of a failover group changes, a gratuitous ARP packet is transmitted. To ensure
that other clients and servers receive the new IP-MAC address mapping, APA/LAN Monitor transmits
more gratuitous ARP packets for 1 minute.
When this option is enabled, LAN Monitor will transmit gratuitous ARP at every
LM_RAPID_ARP_INTERVAL
, for a total of LM_RAPID_ARP_COUNT times immediately after the
MAC address changes. After completing the
LM_RAPID_ARP process, gratuitous ARP packets will be
transmitted every 5 seconds until one minute has elapsed since the first gratuitous ARP was transmit-
ted.
When this option is disabled, LAN Monitor will transmit gratuitous ARP at every 5 seconds for 1
minute.
•
LM_RAPID_ARP_INTERVAL
Number of microseconds between rapid gratuitous ARP messages. The range of valid values is
1000000-4000000, inclusive (1 second to 4 seconds). The default value is 1000000 (1 second). Specify
a whole number of seconds as the value you specify is automatically rounded up to the next whole
number of seconds. The value must be a valid integer. If the value is not in the valid range and
LM_RAPID_ARP is on, the interval value last processed with the lanapplyconf command is used.
If LM_RAPID_ARP is off, this value is ignored for the corresponding failover group.
•
LM_RAPID_ARP_COUNT
Number of gratuitous ARP packets sent rapidly. The valid range is 5-60, inclusive. The default value
is 10. The value must be a valid integer. If the value is not in the valid range and LM_RAPID_ARP is
on, the count value last processed with the lanapplyconf command is used. If LM_RAPID_ARP is
off, this value is ignored for the corresponding failover group.
Proactive Failover
By default, the port in a failover group with the highest priority is the active port. With proactive fail-
over, the port that is the most efficient at carrying traffic is the active port. Efficiency is determined by
assigning a cost to each port in a failover group. This cost is divided by the port’s current speed to yield a
normalized port cost; port speed is the number of links in a link aggregate multiplied by the link speed,
or in the case of a physical port, only the link speed. The lower the normalized port cost, the higher the
port’s efficiency.
During certain LAN Monitor events, the normalized port cost might change on the active or standby
ports. When these events occur, the normalized port cost of the active port and the standby ports are
compared. If a standby port has a lower normalized port cost than the active port, the standby port
becomes the active port.
2 Hewlett-Packard Company − 2 − HP-UX 11i Version 3: September 2010