Technical data

Glossary-4 Fabric OS Administrator’s Guide
Publication Number: 53-0000518-09
CP Control processor.
credit As it applies to Fibre Channel technology, the number of receive buffers available to transmit frames
between ports. See also “BB_Credit”.
D
D_ID Destination identifier. A 3-byte field in the frame header, used to indicate the address identifier of the
N_Port to which the frame is headed.
defined zone
configuration
The set of all zone objects defined in the fabric. Can include multiple zone configurations. See also
“zone configuration”.
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”.
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.
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 from 1 through 239.
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 type of switch port that can be connected to an E_Port on another switch to create an
ISL. See also “ISL”.
ELP Exchange link parameters.
ELS Extended link service. ELSs are sent to the destination N_Port to perform the requested function or
service. ELS is a Fibre Channel standard that is sometimes referred to as "Fibre Channel Physical
(FC_PH) ELS."
EM Environmental monitor. Monitors FRUs and reports failures.
embedded port An embedded port (or domain controller) communicates and get updates from other switches'
embedded ports. The well-known address is fffcdd, where dd = domain number.