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DES-7200 Configuration Guide Chapter 6 Super VLAN Configuration
6-2
The following presents the communication procedure between two aggregated
sub VLANs.
As shown in the above diagram, Sub VLAN2 and Sub VLAN4 are aggregated to
form Super VLAN3. An IP address is assigned to Super VLAN3, and both Sub
VLAN2 and Sub VLAN4 are located in this subnet. Supposing PC1 in Sub
VLAN2 wants to communicate with PC2 in the subnet, after knowing that the
peer is located in the same network segment, PC1 directly sends an ARP
request packet with a destination IP address. Upon receiving this ARP request
packet, the layer 3 device directly broadcasts this packet through layer 2 within
Sub VLAN2, and sends a copy to the ARP module of the device. This module
first checks whether the destination IP address in the ARP request packet is in
Sub-VLAN2. If so, it will discard this packet because it and PC1 are located in
the same broadcast domain, and the destination host will directly respond to
PC1. If not, it will respond PC1 with the MAC address of SuperVLAN3, acting as
an ARP agent. For example, PC1 and PC2 have to communicate through the
ARP agent which forwards packets from PC1 to PC2. However, PC1 and PC3
can communicate directly without a forwarding device.
Restrictions:
z A super VLAN can only contain sub VLANs. The sub VLAN contains actual
physical ports.
z A super VLAN cannot serve as a sub VLAN of other Super VLANs.
z A super VLAN cannot be used as the normal 1Q VLAN.
z VLAN 1 cannot be used as a super VLAN.
z A sub VLAN cannot be configured as a network interface, and cannot be
assigned with an IP address.
z Super VLAN does not support VRRP, IGMP Snooping and PIM Snooping.