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Configuration Examples
354
S3300 Smart Managed Pro Switch
VLAN Routing Interface Configuration Example
VLANs divide broadcast domains in a LAN environment. Whenever hosts in one VLAN need
to communicate with hosts in another VLAN, the traffic must be routed between them. This is
known as inter-VLAN routing. On the switch, it is accomplished by creating Layer 3 interfaces
(switch virtual interfaces (SVI)).
When a port is enabled for bridging (default) rather than routing, all normal bridge processing
is performed for an inbound packet, which is then associated with a VLAN. Its MAC
destination address (MAC DA) and VLAN ID are used to search the MAC address table. If
routing is enabled for the VLAN, and the MAC DA of an inbound unicast packet is that of the
internal bridge-router interface, the packet is routed. An inbound multicast packet is
forwarded to all ports in the VLAN, plus the internal bridge-router interface, if it was received
on a routed VLAN.
Since a port can be configured to belong to more than one VLAN, VLAN routing might be
enabled for all of the VLANs on the port, or for a subset. VLAN Routing can be used to allow
more than one physical port to reside on the same subnet. It could also be used when a
VLAN spans multiple physical networks, or when additional segmentation or security is
required. A port can be either a VLAN port or a router port, but not both. However, a VLAN
port can be part of a VLAN that is itself a router port.
Complete these steps to configure a switch to perform interVLAN routing.
1.
Use the IP Configuration screen to enable routing on the switch.
For more information about this step, see
2.
Determine the IP addresses you want to assign to the VLAN interface on the switch.
For the switch to be able to route between the VLANs, the VLAN interfaces must be
configured with an IP address. When the switch receives a packet destined for another
subnet/VLAN, the switch looks at the routing table to determine where to forward the
packet. The packet is then passed to the VLAN interface of the destination. It is then sent
to the port where the end device is attached.
3.
Use the VLAN Routing Wizard screen to create a routing VLAN, configure the IP address
and subnet mask, and to add the member ports.
In the following figure, VLAN 300 is created with IP address 10.1.2.1 and subnet mask
255.255.255.0, with ports 9, 10, and 11 as untagged members.
Характеристики
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