Brocade Glossary 7
Publication Number: 53-1000040-03
Glossary
data migration
console
(DMC) The graphical user interface to the DMM appliance. See also DMM appliance.
DCC Direct cable connection. DCC does not require network interface cards (NICs), making it relatively
inexpensive and simple; however, it provides a limited connection between two PCs, and the data
transfer rate is slower than with a true LAN.
dedicated
simplex
A connection method that permits a single N_Port to simultaneously initiate a session with one N_Port
as an initiator and have a separate Class 1 connection to another N_Port as a recipient.
defined zone
configuration
The complete set of all zone objects defined in the zoning database. The zoning database is fabric wide,
and thus includes all alias, zone, and configuration definitions for the entire fabric. Multiple zone
configurations can be defined in the zone data, though only one can be active on the fabric. See also
effective zone configuration, enabled zone configuration, and zone configuration.
deskew In the Brocade trunking feature, the time difference between traffic traveling over each ISL other than
the shortest ISL in the group and traffic traveling over that shortest ISL. The deskew number
corresponds to nanoseconds divided by 10. The firmware automatically sets the minimum deskew value
of the shortest ISL to 15.
device-based
routing
A routing policy in which the choice of routing path is based on the Fibre Channel addresses of the
source device (S_ID) and the destination device (D_ID), improving path utilization for better
performance. Thus, the same route is always used and the sequence of exchanges is guaranteed. See
also port-based routing and exchange-based routing.
DH-CHAP Diffie-Hellman Challenge-Handshake Authentication Protocol. An implementation of CHAP using
Diffie-Hellman encryption. See also CHAP.
DHCP Dynamic Host Configuration Protocol. An Internet protocol for automating the configuration of
computers that use TCP/IP. DHCP can be used to automatically assign IP addresses, to deliver TCP/IP
stack configuration parameters such as the subnet mask and default router, and to provide other
configuration information such as the addresses for printer, time and news servers.
DHCPD Dynamic Host Configuration Protocol daemon.
digital
certificate
An electronic document issued by a CA (certificate authority) to an entity, containing the public key and
identity of the entity. Entities in a secure fabric are authenticated based on these certificates. See also
authentication and public key.
director A highly-available and scalable Fibre Channel switch that uses a chassis and blade architecture. The
SilkWorm 12000, 24000, and 48000 are all Brocade directors.
discovery
domain
(DD) An iSCSI access control concept. An iSCSI discovery domain is created between iSCSI hosts and
targets using their IQN. See also IQN.
discovery
domain set
(DDSet) An iSCSI access control concept. A set consisting of an iSCSI host and an iSCSI target.
disparity The proportion of 1s and 0s in an encoded character. “Neutral disparity” means an equal number of
each, “positive disparity” means a majority of 1s; and “negative disparity” means a majority of 0s.
