Technical data

Brocade SilkWorm 4100 Hardware Reference Manual Glossary-7
Publication Number: 53-0000563-02
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 set of all zone objects defined in the fabric. Can include multiple zone configurations. See also
enabled zone configuration, zone configuration.
deskew Related to 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.
DH-CHAP Diffie-Hellman Challenge-Handshake Authentication Protocol. An implementation of CHAP using
Diffie-Hellman encryption. See also CHAP.
DHCP Dynamic Host Configuration Protocol.
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, CA, public key.
director A Brocade SilkWorm 12000, 24000, or 48000 switch.
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.
DLS Dynamic load-sharing. Dynamic distribution of traffic over available paths. Allows for recomputing of
routes when an Fx_Port or E_Port changes status.
DMTF Distributed Management Task Force.
domain
controller
A domain controller or embedded port communicates with and gets updates from other switches'
embedded ports. The well-known address is fffcdd, where dd = domain number).
domain ID A unique identifier for all switches in a fabric, used in routing frames. Usually automatically assigned
by the principal switch but can be assigned manually. The domain ID for a Brocade SilkWorm switch
can be any integer between 1 and 239.
DTE Data terminal equipment. Usually refers to a terminal.
DWDM Dense wave division multiplexing. Allows more wavelengths to use the same fiber. See WDM.
E
E_D_TOV Error-detect timeout value. The minimum amount of time a target waits for a sequence to complete
before initiating recovery. Can also be defined as the maximum time allowed for a round-trip
transmission before an error is declared. See also R_A_TOV, RR_TOV.
E_Port Expansion port. A standard Fibre Channel mechanism that enables switches to network with each other,
creating an ISL. See also ISL.