Protocol-Based Vlans - Hirschmann MACH 4000 User Manual

Protocol-based VLANs

8 Protocol-based VLANs
Along with port-based VLANs based on IEEE 802.1Q, the Switch also
supports protocol-based VLANs based on IEEE 802.1v.
With port-based VLANs, the Switch uses the port VLAN ID of the receiving
port to determine which VLAN a data packet belongs to if it is received with-
out a VLAN tag.
With protocol-based VLANs, the Switch uses the protocol of the received
data packet to determine which VLAN a data packet belongs to if it is re-
ceived without a VLAN tag. The Switch supports the protocols
IP,
ARP,
IPX.
Data packets from other protocols received without a VLAN tag are assigned
to a VLAN by the Switch in accordance with the port VLAN ID.
For the VLAN assignment, the Switch takes into account
firstly, the VLAN tag,
then the protocol the data packet belongs to,
and finally, the port VLAN ID.
Protocol-based VLANs enable you to transfer data packets not relevant to
routing across IP subnetwork boundaries. Data packets relevant to routing
are IP and ARP data packets.
Ro1
VLAN 2
VLAN 3
PC2
SN "alpha"
IP: 10.0.1.0/24
Figure 31: Example of a protocol-based VLAN
Routing L3P
Release 4.0 11/07
Ro2
VLAN 2
Port
2.3
2.1 2.2
SN "beta"
IP: 10.0.2.0/24
PC1
VLAN 2
Se1
VLAN 4
89