H3C Technologies H3C S10500 Series Switches - Manual (Page 203)

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VLAN mapping configuration
VLAN mapping overview
VLAN mapping re-marks VLAN tagged traffic with new VLAN IDs. H3C provides the following types of
VLAN mapping:
• One-to-one VLAN mapping—Replaces one VLAN tag with another. You can use one-to-one VLAN
mapping to sub-classify traffic from a particular VLAN for granular QoS control.
• Many-to-one VLAN mapping—Replaces multiple VLAN tags with the same VLAN tag. You can use
many-to-one VLAN mapping to aggregate traffic from different VLANs to regulate the aggregate
traffic as a whole. Many-to-one VLAN mapping is usually used together with one-to-one VLAN
mapping.
• One-to-two VLAN mapping—Tags single-tagged packets with an outer VLAN tag. One-to-two
VLAN mapping expands the VLAN tag space, and enables a service provider and its customers to
assign VLANs independently without the risk of VLAN assignment conflicts.
• Two-to-two VLAN mapping—Replaces the outer and inner VLAN IDs of double tagged traffic with
a new pair of VLAN IDs. You can use two-to-two VLAN mapping to enable two remote sites in
different VLANs to communicate at Layer 2 across two service provider networks that use different
VLAN assignment schemes.
Application scenario of one-to-one and many-to-one VLAN
mapping
Figure 63 shows a typical application scenario in which each home gateway uses different VLANs to
transmit the PC, VoD, and VoIP services.