Downdelay; Lacp_Rate; Qlogic Adapter Bonding Modes Under Linux - Qlogic 3000 Series User Manual

arp_interval
This parameter specifies the ARP link monitoring frequency in milliseconds. When
ARP monitoring is used in an etherchannel compatible mode (modes 0 and 2), the
switch must be configured in a mode that evenly distributes packets across all
links.
When the switch is configured to distribute the packets in an XOR fashion, all
replies from the ARP targets are received on the same link, which could cause the
other team members to fail. ARP monitoring should not be used with miimon. A
value of 0 disables ARP monitoring. The default value is 0.
arp_ip_target
This parameter specifies the IP addresses to use as ARP monitoring peers when
arp_interval is greater than 0. These are the targets of the ARP request sent
to determine the health of the link to the targets.
Specify these values in ddd.ddd.ddd.ddd format. Multiple IP addresses must
be separated by a comma. At least one IP address must be given for ARP
monitoring to function. The maximum number of targets that can be specified
is 16. The default value is no IP addresses.

downdelay

This parameter specifies the time, in milliseconds, to wait before disabling a slave
after a link failure has been detected. This option is valid only for the miimon link
monitor. The downdelay value must be a multiple of the miimon value;
otherwise, the value will be rounded down to the nearest multiple. The default
value is 0.

lacp_rate

This parameter specifies the rate at which the link partner transmits LACPDU
packets in 802.3ad mode. Possible values are:
Slow or 0: Request partner to transmit LACPDUs every 30 seconds
(default).
Fast or 1: Request partner to transmit LACPDUs every 1 second.

QLogic Adapter Bonding Modes Under Linux

There are several modes that can be used for bonding the QLogic adapter under
Linux. Note that there are variations in support and usage with respect to the
hardware and Linux distributions, and that not all the modes are favorable for a
given system and network topology.
NE0154601-00 A
7–Linux Configuration for Bonding Mode and Virtual LAN (VLAN)
Linux Bonding Mode
7-5