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IP Link
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A communication facility or medium over which nodes can
communicate at the link layer. The link layer is the layer immediately following
IPv4 or IPv6. Examples include Ethernets, simple or bridged, or ATM networks.
One or more IPv4 subnet numbers or prefixes are assigned to an IP link. A
subnet number or prefix cannot be assigned to more than one IP link. In ATM
LANE, an IP link is a single emulated LAN. When using ARP, the scope of the
ARP protocol is a single IP link.
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Network Interface Card (NIC)
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Network adapter that is either internal
or a separate card that serves as an interface to a link.
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Physical interface
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A node's attachment to a link. This
attachment is often implemented as a device driver plus a network adapter.
Some network adapters can have multiple points of attachment, for example,
qfe. The usage of Network adapter in this document refers
to a "Single Point of Attachment."
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Physical interface group
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The set of physical interfaces on a
system that is connected to the same link. The set is identified by assigning
the same (non-null) character string name to all the physical interfaces in
the group.
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Physical interface group name
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A name that is assigned
to a physical interface that identifies the group. The name is local to a
system. Multiple physical interfaces, sharing the same group name, form a
physical interface group.
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Failure detection
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The process of detecting when a NIC
or the path from the NIC to a layer 3 device no longer works.
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Repair detection
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The process of detecting when a NIC
or the path from the NIC to some layer 3 device starts operating correctly
after a failure.
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Failover
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The process of switching network access from
a failed interface to a good physical interface. Network access includes IPv4
unicast, multicast, and broadcast traffic, as well as IPv6 unicast and multicast
traffic.
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Failback
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The process of switching back network access
to an interface that is detected to have been repaired.
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Standby Interface
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A physical interface that is not used
to carry data traffic unless some other physical interface in the group has
failed.
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