Wired Switching; Dhcp Servers; Ddns; Vlan Enhancements - Motorola RFS7000 Series System Reference Manual

1.2.3 Wired Switching

The switch includes the following wired switching features:
•

DHCP Servers

•

DDNS

•

VLAN Enhancements

• Interface Management
1.2.3.1 DHCP Servers
Dynamic Host Configuration Protocol (DHCP) allows hosts on an IP network to request and be assigned IP
addresses, and discover information about the network to which they are attached. Configure address pools
for each subnet. When a DHCP client requests an IP address, the DHCP server assigns an IP address from the
address pool configured for that subnet.
When a DHCP server allocates an address for a DHCP client, the client is assigned a lease. The lease expires
after an pre-determined interval. Before a lease expires, clients (to which leases are assigned) are expected
to renew the lease to continue to use the addresses. Once the lease expires, the client is no longer permitted
to use the leased IP address. For information on defining the switch DHCP configuration, see
Configuring the Switch DHCP Server on page
1.2.3.2 DDNS
Dynamic DNS (DDNS) is a method of keeping a domain name linked to a changing IP address. Typically, when
a user connects to a network, the user's ISP assigns it an unused IP address from a pool of IP addresses. This
address is only valid for a short period. Dynamically assigning IP addresses increases the pool of assignable
IP addresses. DNS maintains a database to map a given name to an IP address used for communication on the
Internet. The dynamic assignment of IP addresses makes it necessary to update the DNS database to reflect
the current IP address for a given name. Dynamic DNS updates the DNS database to reflect the correct
mapping of a given name to an IP address.
1.2.3.3 VLAN Enhancements
The switch has incorporated the following VLAN enhancements:
• Physical port (L2) is now operated in Trunk Mode or Access Mode.
• A VLAN now allows an AP to receive and send only untagged packets. All tagged packets received
by the AP are discarded. The untagged traffic received is internally placed in an "access vlan".
• A trunk port can now receive, both tagged and untagged packets. Only one native VLAN per trunk port
is supported. All untagged traffic received on is placed into a "native vlan".
• You can now configure a set of allowed VLANs on a trunk port. Packets received on this port belonging
to other VLANs are discarded.
5-4.
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Overview