HP UX Auto Port Aggregation (APA) Software manual Failover Group Advanced Parameters

Recommended configuration: Servers that need highly available network interfaces.

CAUTION: For HP Serviceguard configurations, the member links of an APA Hot Standby link aggregate must be bridged to function properly. If they are not, the node or cluster might go down when a member link fails.

Group Capability

An integer value that determines which network physical ports can be aggregated into a common FEC_AUTO mode link aggregate or MANUAL mode link aggregate for HP APA releases for HP-UX 11i v1 prior to September 2007. The easiest way to create a value is to use the instance number of the link aggregate as the group capability. You must use the same group capability for all ports that you want to join this link aggregate and use the same group capability for the link aggregate.

TIP: When configuring link aggregates, if more than one FEC_AUTO aggregation is used on the system, each FEC_AUTO aggregation must have a different group capability.

Key

An integer value that determines which network physical ports can be aggregated into a common LACP_AUTO mode link aggregate. The easiest way to create a value is to use the instance number of the link aggregate as the key. You must use the same key value for all of the ports that you want to join this link aggregate and use the same key value for the link aggregate.

Failover Group Advanced Parameters

Dead Count

The number of polling packets that are missed before LAN Monitor sends a nettl log message to the user that indicates the link might have problems and the network must be checked. The default is 3.

Polling Interval

The number of microseconds between polling messages. Polling messages are sent between links in the specified interval for monitoring the health of all the links in the link aggregate. Default is 10,000,000 (10 seconds).

Rapid ARP

Enables (on) or disables (off) the ability to transmit gratuitous ARP messages at intervals shorter than 5 seconds. By default, this parameter is on.

By default, when the MAC address of a failover group changes, LAN Monitor transmits one gratuitous ARP packet. Then, it transmits gratuitous ARP packets at a set interval (LM_RAPID_ARP_INTERVAL) for a set number of times (LM_RAPID_ARP_COUNT) to ensure that other clients and servers receive the new IP-MAC address mapping. LAN Monitor then transmits gratuitous ARP packets every 5 seconds until 1 minute has elapsed from the first gratuitous ARP packet.

If you disable this parameter, immediately after the MAC address changes LAN Monitor transmits gratuitous ARP packets every 5 seconds for 1 minute.

Failover Group Advanced Parameters 35