The process of communication between two aggregated sub VLANs when the VLAN is
aggregated is described below. See the above diagram:
Sub VLAN2 and Sub VLAN4 are aggregated to Super VLAN3. An IP sub-net is assigned to
Super VLAN3, and both Sub VLAN2 and Sub VLAN4 are located in this subnet. Suppose
that the host PC1 in Sub VLAN2 needs to communicate with another host 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 therange of 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 yes, 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 needing a forwarding device.
Restrictions:
Super VLAN cannot contain any member port. It only contains Sub VLAN, which
contains actual physical ports.
Super VLAN cannot serve as a sub VLAN of other Super VLANs.
Super VLAN cannot be used as the normal 1Q VLAN.
VLan 1 cannot be used as SuperVLAN.
Sub VLAN cannot be configured as network interface, and cannot be assigned with IP
address.
SVLAN cannot use VRRP and does not support multicast.
Super VLAN interface-based ACL and QOS configurations are not valid to the Sub
VLAN.
9.2 Configuring Super VLAN
Using following command to configure Super VLAN.
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