Specifications

Virtual LANS Features Roadmap
3
12.3(8)T4 Cisco HWIC-4ESW and
HWIC-D-9ESW
EtherSwitch Interface
Cards
Cisco EtherSwitch HWICs are 10/100BASE-T
Layer 2 Ethernet switches with Layer 3 routing
capability. (Layer 3 routing is forwarded to the host
and is not actually performed at the switch.) Traffic
between different VLANs on a switch is routed
through the router platform. Any one port on a
Cisco EtherSwitch HWIC may be configured as a
stacking port to link to another Cisco EtherSwitch
HWIC or EtherSwitch network module in the same
system. An optional power module can also be added
to provide inline power for IP telephones. The
HWIC-D-9ESW HWIC requires a double-wide card
slot.
Cisco HWIC-4ESW and
HWIC-D-9ESW
EtherSwitch Interface
Cards
12.2(2)XT
12.2(8)T
12.2(15)ZJ
12.3(4)T
EtherSwitch Module The EtherSwitch network module is supported on
Cisco 2600 series, Cisco 3600 series, and
Cisco 3700 series routers. The EtherSwitch network
module is a modular, high-density voice network
module that provides Layer 2 switching across
Ethernet ports. The EtherSwitch network module has
sixteen 10/100 switched Ethernet ports with
integrated inline power and QoS features that are
designed to extend Cisco AVVID-based
voice-over-IP (VoIP) networks to small branch
offices.
EtherSwitch Network
Module
12.3(2)XC Managed VLAN Switch The Managed LAN Switch feature enables the
control of the four switch ports in Cisco 831, 836,
and 837 routers. Each switch port is associated with
a Fast Ethernet interface.
Managed LAN Switch
12.3(7)T
12.3(7)XI1
IEEE 802.1Q-in-Q
VLAN Tag Termination
Encapsulating IEEE 802.1Q VLAN tags within
802.1Q enables service providers to use a single
VLAN to support customers who have multiple
VLANs. The IEEE 802.1Q-in-Q VLAN Tag
Termination feature on the subinterface level
preserves VLAN IDs and keeps traffic in different
customer VLANs segregated.
Configuring
Routing Between VLANs
• Configuring IEEE
802.1Q-in-Q VLAN
Tag Termination,
page 350
Table 1 Supported Network Address Translation Features (continued)
Release Feature Name Feature Description Where Documented