10-01-2015
Quote:
IPMP provides increased reliability, availability, and network performance for systems with multiple physical interfaces. Occasionally, a physical interface or the networking hardware attached to that interface might fail or require maintenance. Traditionally, at that point, the system can no longer be contacted through any of the IP addresses that are associated with the failed interface. Additionally, any existing connections to the system using those IP addresses are disrupted.
By using IPMP, you can configure one or more physical interfaces into an IP multipathing group, or IPMP group. After configuring IPMP, the system automatically monitors the interfaces in the IPMP group for failure. If an interface in the group fails or is removed for maintenance, IPMP automatically migrates, or fails over, the failed interface's IP addresses. The recipient of these addresses is a functioning interface in the failed interface's IPMP group. The failover feature of IPMP preserves connectivity and prevents disruption of any existing connections. Additionally, IPMP improves overall network performance by automatically spreading out network traffic across the set of interfaces in the IPMP group. This process is called load spreading.
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LEARN ABOUT SUNOS
if_mpadm
if_mpadm(1M) System Administration Commands if_mpadm(1M)
NAME
if_mpadm - change operational status of interfaces within a multipathing group
SYNOPSIS
/usr/sbin/if_mpadm -d interface_name
/usr/sbin/if_mpadm -r interface_name
DESCRIPTION
Use the if_mpadm utility to change the operational status of interfaces that are part of an IP multipathing group. If the interface is
operational, you can use if_mpadm -d to detach or off-line the interface. If the interface is off-lined, use if_mpadm -r to revert it to
its original state.
When a network interface is off-lined, all network access fails over to a different interface in the IP multipathing group. Any addresses
that do not failover are brought down. Network access includes unicast, broadcast, and multicast for IPv4 and unicast and multicast for
IPv6. Addresses marked with IFF_NOFAILOVER do not failover. They are marked down. After an interface is off-lined, the system will not use
the interface for any outbound or inbound traffic, and the interface can be safely removed from the system without any loss of network
access.
The if_mpadm utility can be applied only to interfaces that are part of an IP multipathing group.
OPTIONS
The if_mpadm utility supports the following options:
-d interface_name Detach or off-line the interface specified by interface_name.
-r interface_name Reattach or undo the previous detach or off-line operation on the interface specified by interface_name. Unless
the -d option was used to detach or off-line the interface, this option will fail.
EXAMPLES
Example 1: Detaching an Interface
Use the following command to off-line or detach the interface. All network access will failover from hme0 to other interfaces in the same
IP multipathing group. If no other interfaces are in the same group, the operation will fail.
example% if_mpadm -d hme0
Example 2: Reattaching an Off-line Interface
Use the following command to undo the previous operation. Network access will failback to hme0.
example% if_mpdadm -r hme0
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
|Interface Stability |Unstable |
+-----------------------------+-----------------------------+
SEE ALSO
ifconfig(1M), in.mpathd(1M), attributes(5)
DIAGNOSTICS
off-line failed as there is no other functional interface available in the multipathing group for failing over the network access.
This message means that other interfaces in the group are failed over already or the multipathing configuration was not suitable for com-
pleting a failover.
off-line cannot be undone because multipathing configuration is not consistent across all the interfaces in the group.
This message means that some interfaces in the IP multipathing group are not configured consistently with other interfaces in the group,
for example, one of the interfaces in the group does not have an IFF_NOFAILOVER address.
SunOS 5.10 3 Sep 2002 if_mpadm(1M)