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Created by dave. Last edited by dave, 17 years and 11 days ago. Viewed 7,880 times. #6
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IP Multipath

An IPMP configuration typically consists of two or more physical interfaces on the same system that are attached to the same IP link. These physical interfaces might or might not be on the same NIC. The interfaces are configured as members of the same IPMP group. If the system has additional interfaces on a second IP link, you must configure these interfaces as another IPMP group.

Note that this page is deliberately terse; see the references below for pages which might expand more on the actual mechanisms used in the "probe-based" and "link-based" options.

Probe-based IPMP

In this scenario you have a Sun V100 with two dmfe interfaces. You have three IP addresses on the same subnet (in this case 10.0/16; refer to /etc/netmasks):

  • the main IP address of the system
  • the test IP address of dmfe0
  • the test IP address of dmfe1
We will use the inventive name "failovergroup" as the name of our failover group.

/etc/hostname.dmfe0 netmask + broadcast + group failovergroup up addif deprecated -failover netmask + broadcast + up

/etc/hostname.dmfe1 netmask + broadcast + deprecated group failovergroup -failover standby up

Ref: >>

Link-Based IPMP

(Solaris 10; depends on the interfaces supporting it)


$hostname group $groupname up


group $groupname up


  • simple
  • only detects immediate link failure; if your problem is deeper in the network, your failure is never detected.
Ref: >>
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This is a collection of techical information, much of it learned the hard way. Consider it a lab book or a /info directory. I doubt much of it will be of use to anyone else.

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