Brocade Communications Systems Brocate Ethernet Access Switch 6910 - Manual (Page 1173)

Brocade 6910 Ethernet Access Switch Configuration Guide 1123
53-1002581-01
Appendix
D
Glossary and Acronyms
ACL
Access Control List. ACLs can limit network traffic and restrict access to certain users or devices by
checking each packet for certain IP or MAC (i.e., Layer 2) information.
ARP
Address Resolution Protocol converts between IP addresses and MAC (hardware) addresses. ARP is
used to locate the MAC address corresponding to a given IP address. This allows the switch to use
IP addresses for routing decisions and the corresponding MAC addresses to forward packets from
one hop to the next.
BOOTP
Boot Protocol. BOOTP i
s
used to provide bootup information for network devices, including IP
address information, the address of the TFTP server that contains the devices system files, and the
name of the boot file.
CoS
Class of Service is supported by prioritizing packets based on the required level of service, and
then placing them in the appropriate output queue. Data is transmitted from the queues using
weighted round-robin service to enforce priority service and prevent blockage of lower-level queues.
Priority may be set according to the port default, the packet’s priority bit (in the VLAN tag), TCP/UDP
port number, IP Precedence bit, or DSCP priority bit.
DHCP
Dynamic Host Control Protocol. Provides a framework for passing configuration information to hosts
on a TCP/IP network. DHCP is based on the Bootstrap Protocol (BOOTP), adding the capability of
automatic allocation of reusable network addresses and additional configuration options.
DHCP Option 82
A relay option for sending information about the requesting client (or an intermediate relay agent)
in the DHCP request packets forwarded by the switch and in reply packets sent back from the
DHCP server. This information can be used by DHCP servers to assign fixed IP addresses, or set
other services or policies for clients.
DHCP Snooping
A technique used to enhance network security by snooping on DHCP server messages to track the
physical location of hosts, ensure that hosts only use the IP addresses assigned to them, and
ensure that only authorized DHCP servers are accessible.