CTS HES-3109 Series User Manual

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2. Enable the Managed Switch to automatically get IP address from the DHCP server.
Command / Example
Description
Switch(config)# ip address dhcp
Enable DHCP mode.
No command
Switch(config)# no ip address dhcp
Disable DHCP mode.
Show command
Switch(config)# show ip address
Show the current IP configurations or verify
the configured IP settings.
3. Enable or disable DHCP snooping globally.
Command / Example
Parameter
Description
Switch(config)# ip dhcp
snooping
Enable DHCP snooping function.
Switch(config)# ip dhcp
snooping dhcp-server [port_list]
[port_list]
Specify DHCP server trust ports.
No command
Switch(config)# no ip dhcp snooping
Disable IGMP snooping function.
Switch(config)# no ip dhcp snooping dhcp-server
Remove all the DHCP server trust
ports
Show command
Switch(config)# show ip dhcp snooping
Show current DHCP snooping status
including DHCP server trust ports.
4. Enable or disable IGMP snooping globally.
IGMP, Internet Group Management Protocol, is a communications protocol used to manage
the membership of Internet Protocol multicast groups. IGMP is used by IP hosts and adjacent
multicast routers to establish multicast group memberships. It can be used for online
streaming video and gaming, and allows more efficient use of resources when supporting
these uses.
IGMP Snooping is the process of listening to IGMP traffic. IGMP snooping, as implied by the
name, is a feature that allows the switch to “listen in” on the IGMP conversation between
hosts and routers by processing the layer 3 packets IGMP packets sent in a multicast
network.
When IGMP snooping is enabled in a switch, it analyses all the IGMP packets between hosts
connected to the switch and multicast routers in the network. When a switch hears an IGMP
report from a host for a given multicast group, the switch adds the host‟s port number to the
multicast list for that group. And, when the switch hears an IGMP Leave, it removes the host‟s
port from the table entry.
IGMP snooping can very effectively reduce multicast traffic from streaming and other
bandwidth intensive IP applications. A switch using IGMP snooping will only forward multicast
traffic to the hosts interested in that traffic. This reduction of multicast traffic reduces the
packet processing at the switch (at the cost of needing additional memory to handle the

CTS HES-3109 Series Specifications

General

Brand	CTS
Model	HES-3109 Series
Category	Switch
Language	English