User`s guide

How Your Cayman 3220-H Works Cayman 3220-H User’s Guide
C-4 December 2000
addressed to a MAC address that isn't in its bridging table, the
Cayman 3220-H relays the packet to all network interfaces other than
the one from which it received the packet. If it later receives a reply
from the destination host, it adds that host's MAC address and the
interface appropriate for reaching that host to its bridging table.
The Cayman 3220-H tracks the age of each entry in its bridging table,
and deletes entries that aren't used after 10 minutes. If more than
255 entries are active at the same time, the Cayman 3220-H discards
the oldest entries to make room for new ones.
Bridging of non-TCP/IP protocols is disabled by default. You must use
the set bridge CLI commands if you want your Cayman 3220-H to
function as a network bridge.
About DHCP The Dynamic Host Configuration Protocol (DHCP) allows one host
on a TCP/IP network to provide configuration information to other
hosts on that network. DHCP is built on a client-server model, where
designated DHCP servers allocate network addresses and deliver
configuration parameters to dynamically configured hosts. When
DHCP is enabled, the DHCP client requests configuration
information, such as an IP address and network information, from a
DHCP server each time it is restarted. The DHCP server responds to
the request by sending the client an IP address and information
about a network, such as the network's subnet mask, broadcast
address, name service information, authentication information, and
routing information.
Cayman 3220-H as
DHCP Server
The Cayman 3220-H can provide IP addresses for as many as 253
devices on the subnet connected to its Ethernet hub ports. When the
Cayman 3220-H receives a DHCP request from a client computer, it
determines what address to assign by checking its DHCP lease table
to identify an unused address in its DHCP range. When it finds an
address that should be free, the Cayman 3220-H sends a broadcast
message on the network to verify that no other host is using the same
IP address. If another host indicates that it is using the selected