Chapter 16 VLAN
73
16 VLAN
16.1
Overview
VLAN is used to subdivide a LAN into smaller entities known as VLAN1, VLAN2, VLAN3, VLAN 4094. A
device in a particular VLAN can monitor traffic in that VLAN only, and cannot monitor packets in any other
VLANs. This provides an important level of security and also assists the user to do certain kinds of QoS
.
In Figure 16-1, below, VLAN1 and VLAN2 both feed into the VLAN-aware Ethernet Switch. The switch
assigns a Port VID to each port. VLAN1 is assigned VID:3 and VLAN2 is assigned VID:5. Transmissions
from VLAN1(VID:3) and VLAN2(VID:5) are put into tagged packets by the switch and then passed on to the
Ethernet Port of the Loop-IP 6610.
The IP-6610 reads the tag on the packets and uses this VLAN id to make packet forwarding decisions. In
the diagram below, the packets are to be sent via an E1 or DS1 interface to the Frame Relay Network. A
physical interface such as an E1 or DS1 interface can carry multiple logical channels. Each of these
channels can carry VLAN traffic( eg. VID:3, pvc1). The IP 6610 forwards packets of a VLAN to a proper
logical channel according to the tags on the packets.
Frame Relay
Network
VLAN-aware
Ethernet Switch
VLAN1
(VID:3)
VLAN2
(VID:5)
Loop-IP
6610
E1 / T1
Ethernet
VLAN1
(VID:3)
VLAN2
(VID:5)
Frame Relay
WAN Link
PVC 2
PVC 1
Tagged
Packets
Tagged
Packets
Figure 16-1 VLAN Application #1
Содержание IP6610
Страница 2: ...2011 Loop Telecommunication International Inc All rights reserved Version 33 23 MAR 2011...
Страница 76: ...Chapter 11 Port Forwarding Virtual Service 53...
Страница 79: ...Chapter 12 QoS 56 Figure 12 1 QoS Application...
Страница 119: ...Chapter 20 Setting Up Firmware Configuration Up Download with TFTP Server 96...