Glossary

Force-authorized An authorized state in which a device connected to the port can communicate on the network without
using the authentication process.
Full-duplex A transmission mode where a device, such as a switch, can transmit and receive data simultaneously.
G
gRPC Network
Management
Interface agent
(gNMI)
A protocol that enables the telemetry agent to transmit pre-configured sensor groups data to the
SmartFabric Director.
H
Half-Duplex A transmission mode where a device, such as a switch, can transmit and receive data, but not at the same
time.
Hello-time The time interval within which the bridge sends BPDUs.
Hop-by-hop
options
An extension header in an IPv6 packet with options that are processed by all IPv6 routers in the packet's
path.
I
IGMP
A communication protocol that is used on IPv4 networks to establish multicast group memberships.
IGMP messages Protocol messages that are used in the host-router communication.
IGMP snooping A switch protocol that listens to the IGMP messages exchanged between the host and router. It
generates a forwarding table that associates ports with multicast groups.
Incoming
Interface (IIF)
An interface on which a multicast packet is received. It can be a source interface or the rendezvous point
(RP).
Internet Small
System Unit
System Interface
(iSCSI)
A TCP/IP-based protocol that establishes and manages connections between servers and storage devices
in a data center network.
Inter-Switch Link
(ISL)
A link that joins two fiber channel switches through E Ports.
IPv4 Routing A routing mechanism that forwards network packets to a destination IP address based on a routing table.
IPv6 Routing A routing mechanism similar to IPv4 that uses 128-bit IPv6 addresses. IPv6 provides additional routing
capabilities such as stateless auto-configuration, header format simplifications, and improved support for
options and extensions.
J
Jumbo frames
Ethernet frames with a payload greater than the standard MTU of 1500 bytes (up to a maximum of 9000
bytes).
Jump host A designated port on a leaf switch in a SmartFabric mode to which an external device such as a laptop
can be connected.
8 Glossary of Terms