ZyXEL Communications VES-1000 Series, User Manual, Page: 46 / 227

VES-1000 Series Ethernet Switch
5-6 Getting Started Screens
Table 5-4 Switch Setup
LABEL DESCRIPTION
VLAN Type Choose Disable , 802.1Q or Port Based from the drop-down list box. The Port Setup and
VLAN Setup screen interfaces change depending on your choice.
Ethernet Port
Uplink and
Port Downlink
Trunking Enable trunking to connect the VES’s two Ethernet ports to a peer Ethernet switch. This
combines the uplink and downlink ports into one logical higher capacity link.
Disable trunking to connect the VES's Ethernet ports to different Ethernet switches.
IGMP
Snooping Traditionally, IP packets are transmitted in one of either two ways - Unicast (1 sender to 1
recipient) or Broadcast (1 sender to everybody on the network). Multicast delivers IP packets
to just a group of hosts on the network.
IGMP (Internet Group Multicast Protocol) is a network-layer protocol used to establish
membership in a Multicast group - it is not used to carry user data. Refer to RFC 2236 for
information IGMP version 2 and RFC 1112 for IGMP version 1.
A layer-2 switch can passively snoop on IGMP Query, Report and Leave (IGMP version 2)
packets transferred between IP Multicast Routers/Switches and IP Multicast hosts to learn the
IP Multicast group membership. It checks IGMP packets passing through it, picks out the
group registration information, and configures multicasting accordingly.
IGMP snooping generates no additional network traffic, allowing you to significantly reduce
multicast traffic passing through your switch.
Clear the check box to have the VES forward multicast traffic to all ports.
Select the check box to have the VES forward multicast traffic only to ports that are members
of that group.
Aging Time Enter a time from 3 to 765 seconds (in multiples of 3). The line card cancels a MAC address’s
registration if there are no more frames with the MAC address before this time period expires.
Port Mirroring
Port mirroring allows you to copy traffic going from one or all ports to another or all ports in order that you can
examine the traffic from the mirror port (the port you copy the traffic to) without interference.
Monitored Port The monitored port is the source port from which you copy (mirror) traffic to the destination
(snooping) port for examination.
From this drop-down list box select a VDSL port to mirror.
Snooping Port The snooping port is the port to which you copy the traffic from monitored ports. Do this to
examine the monitored ports’ traffic in more detail without interfering with the traffic flow on the
monitored port(s).
From this drop-down list box to select an Ethernet port to received the monitored traffic.
Broadcast Storm Control
Broadcast storm control limits the number of broadcast frames that can be stored in the switch buffer or sent out
from the switch. Broadcast frames that arrive when the buffer is full are discarded. Enable this feature
to reduce
broadcast traffic coming into your network.
Threshold From the drop-down list box, select how many broadcast frames the port can store in the
switch buffer.
GARP Timer
Switches join VLANs by making a declaration. A declaration is made by issuing a Join message using GARP.
Declarations are withdrawn by issuing a Leave message. A Leave All message terminates all registrations.
GARP timers set declaration timeout values. See the chapter on VLAN setup for more background information.