User guide

Switching Layer 2 switch functional description
iMG/RG Software Reference Manual (Switching)
2-2
The layer 2 switch uses one additional l 00Mbps or 1000Mbps port as an internal port to communicate to the
central processor in order to access layer 3 services such as routing, VoIP protocols, firewall and NAT security
modules.
The following is the complete set of features available in the switch module:
• IEEE 802.1q tag based VLAN (up to 16 VLANs)
• VLAN ID tag/untag options, per port basis
• Programmable rate limiting, ingress port, egress port, per port basis.
• IGMP v1/v2 snooping for multicast packet filtering
• QoS packet prioritization support: per port, IEEE 802.1p and DiffServ based
• Integrated look-up engine with dedicated 1 K unicast MAC addresses
• Automatic address learning, address aging and address migration
• Full duplex IEEE 802. flow control
• Automatic MDI/MDI-X crossover for plug-and-play on all the ports
2.2.2 Layer 2 switch functional description
A summary of the general switch functions is included below.
2.2.2.1 Port Management
All ports on the switch are numbered sequentially from “lan1” up to the max number of Lan based 10/100
Ethernet ports. For the available number, please see the summary table in the preface. There can be special
function LAN interfaces - such as HPNA - that are addressed where that function is discussed. The admin sta-
tus of the port can be set - as well as the Port Status and Counter value being displayed.
The port speed can also be set - as one of the following options: 100MFull, 100MHalf, 10MFull, 10MHalf, Auto,
Coax. The Coax mode is used when connecting an Ethernet to Coax Balun to the device.
2.2.2.2 Ingress Filtering
The infiltering parameter enables or disables Ingress Filtering of frames admitted on the ports.
If a port has only TAGGED VLANs associated with it - then when InFiltering is set to:
• ON - Only TAGGED packets with a VLAN ID matching VLANs associated with the port are admitted.
UNTAGGED Packets are not admitted.
• OFF - Both TAGGED packets with a VLAN ID Matching VLANS associated with the port are admitted - as
well as UNTAGGED packets. UNTAGGED Packets are tagged with the Default VLAN ID.