Cisco 500 Series Administration Guide

VLAN Management
Overview
Cisco 500 Series Stackable Managed Switch Administration Guide 254
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VLAN Roles
VLANs function at Layer 2. All VLAN traffic (Unicast/Broadcast/Multicast) remains
within its VLAN. Devices attached to different VLANs do not have direct
connectivity to each other over the Ethernet MAC layer. Devices from different
VLANs can communicate with each other only through Layer 3 routers. An IP
router, for example, is required to route IP traffic between VLANs if each VLAN
represents an IP subnet.
The IP router might be a traditional router, where each of its interfaces connects to
only one VLAN. Traffic to and from a traditional IP router must be VLAN untagged.
The IP router can be a VLAN-aware router, where each of its interfaces can
connect to one or more VLANs. Traffic to and from a VLAN-aware IP router can be
VLAN tagged or untagged.
Adjacent VLAN-aware devices exchange VLAN information with each other by
using Generic VLAN Registration Protocol (GVRP). As a result, VLAN information is
propagated through a bridged network.
VLANs on a device can be created statically or dynamically, based on the GVRP
information exchanged by devices. A VLAN can be static or dynamic (from GVRP),
but not both. For more information about GVRP, refer to the GVRP Settings section.
Some VLANs can have additional roles, including:
• Voice VLAN: For more information refer to the Voice VLAN section.
• Guest VLAN: Set in the Edit VLAN Authentication page.
• Default VLAN: For more information refer to the Configuring Default VLAN
Settings section.
• Management VLAN (in Layer 2-system-mode systems): For more
information refer to the Layer 2 IP Addressing section.
QinQ
QinQ provides isolation between service provider networks and customers'
networks. The device is a provider bridge that supports port-based c-tagged
service interface.
With QinQ, the device adds an ID tag known as Service Tag (S-tag) to forward
traffic over the network. The S-tag is used to segregate traffic between various
customers, while preserving the customer VLAN tags.

Cisco 500 Series Specifications

General

Model	Cisco 500 Series
Category	Switch
Mounting	Rack-mountable
Management	Web-based, CLI, SNMP
Ports	24, 48
Port Speed	10/100/1000 Mbps
PoE Support	Available on some models
Switching Capacity	Up to 176 Gbps
MAC Address Table Size	16, 000 entries
Security	ACLs, 802.1X
Quality of Service (QoS)	Yes
Dimensions	Varies by model
Weight	Varies by model
Humidity	10% to 90% non-condensing
Power Supply	Internal
Power Consumption	Varies by model
Jumbo Frame Support	Up to 9216 bytes