21 vlan mapping configuration, Vlan mapping overview, Vlan mapping configuration – H3C Technologies H3C S7500E Series Switches User Manual
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VLAN Mapping Configuration
This chapter includes these sections:
VLAN Mapping Configuration Examples
VLAN Mapping Overview
VLAN mapping re-marks VLAN tagged traffic with new VLAN IDs. S7500E series provides four 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 in conjunction 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 to 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.
Only SC, SD, and EB cards support these four types of VLAN mappings. The SA and EA cards
support only one-to-one VLAN mapping. For detailed information on card types, refer to the
corresponding installation manual.
This section includes:
Application Scenario of One-to-One and Many-to-One VLAN Mapping
Application Scenario of One-to-Two and Two-to-Two VLAN Mapping