Cisco Cisco Email Security Appliance X1050 Guía Del Usuario
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Cisco AsyncOS 8.5.5 for Email Security User Guide
Chapter 36 Advanced Network Configuration
Virtual Local Area Networks (VLANs)
Figure 36-1
Using VLANs to increase the number of networks available on the appliance
VLANs can be used to segment networks for security purposes, to ease administration, or increase
bandwidth. VLANs appear as dynamic “Data Ports” labeled in the format of: “VLAN DDDD” where the
“DDDD” is the ID and is an integer up to 4 digits long (VLAN 2, or VLAN 4094 for example). AsyncOS
supports up to 30 VLANs. Duplicate VLAN IDs are not allowed on your appliance.
bandwidth. VLANs appear as dynamic “Data Ports” labeled in the format of: “VLAN DDDD” where the
“DDDD” is the ID and is an integer up to 4 digits long (VLAN 2, or VLAN 4094 for example). AsyncOS
supports up to 30 VLANs. Duplicate VLAN IDs are not allowed on your appliance.
VLANs and Physical Ports
A physical port does not need an IP address configured in order to be in a VLAN. The physical port on
which a VLAN is created can have an IP that will receive non-VLAN traffic, so you can have both VLAN
and non-VLAN traffic on the same interface.
which a VLAN is created can have an IP that will receive non-VLAN traffic, so you can have both VLAN
and non-VLAN traffic on the same interface.
VLANs can be created on all “Data” and “Management” ports, including fiber optic data ports available
on some appliance models.
on some appliance models.
VLANs can be used with NIC pairing (available on paired NICs) and with Direct Server Return (DSR).
VLAN limitations can send mail through the Email Security appliance. The blue line shows mail coming
from the sales network (VLAN1) to the appliance. The appliance will process the mail as normal and
then, upon delivery, tag the packets with the destination VLAN information (red line).
from the sales network (VLAN1) to the appliance. The appliance will process the mail as normal and
then, upon delivery, tag the packets with the destination VLAN information (red line).
IronPort appliance configured for VLAN1, VLAN2, VLAN3
NOC
DMZ
VLAN
“Router”
VLAN1
VLAN3
VLAN2