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 below
IPv4/IPv6. Examples include Ethernets (simple or bridged) or ATM networks.
One or more IPv4 subnet numbers/prefixes are assigned to an IP link. A subnet
number/prefix can not 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 adaptor which 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 adaptor.
Some network adaptors can have multiple points of attachment, for example,
qfe. The usage of Network Adaptor 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 are connected to the same link. They are 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 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 some 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 detected as having 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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