Concepts And Terms - HP A6600 Configuration Manual

Layer 2 - lan switching
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Concepts and terms

Figure 68
shows a simplified network to help explain the concepts and terms that you may encounter
when working with VLAN mapping.
Figure 68 Basic concepts of VLAN mapping
Uplink traffic: Traffic transmitted from the customer network to the service provider network.
Downlink traffic: Traffic transmitted from the service provider network to the customer network.
Network-side port: A port connected to the service provider network.
Customer-side port: A port connected to the customer network.
Uplink policy: A QoS policy that defines VLAN mapping rules for uplink traffic.
Downlink policy: A QoS policy that defines VLAN mapping rules for downlink traffic.
CVLANs: VLANs assigned for customers.
SVLANs: VLANs assigned for transmitting traffic across the service provider network.
BFIs: Instances for switching packets internally in the switch. The switch removes the VLAN tag of
each incoming packet and then maps the packet to the matching BFI for forwarding. By default, the
switch assigns a packet to the BFI numbered the same as the VLAN ID of the packet, for example,
maps VLAN 1 to BFI 1 and VLAN 2 to BFI 2. When delivering a packet from a BFI to the egress
port, the switch adds the VLAN tag numbered the same as the BFI to the packet. If the egress port is
a tagged member of the VLAN, it sends the packet out with the VLAN tag. If the egress is an
untagged member of the VLAN, it sends the packet out with the VLAN tag removed. Configure a
QoS policy to re-mark the BFI for specific traffic flows.
Removing VLAN tags: The action you configure in a QoS policy to remove the VLAN tags of
packets. When VLAN mapping is used, configure this action to enable the switch to remove the
VLAN tags of packets before assigning them to BFIs. When no VLAN mapping is involved, the
switch performs the action automatically, and you do not have to configure the action.
For more information about QoS policies, see ACL and QoS Configuration Guide.
Network-side port
Customer-side port
Uplink traffic
Downlink traffic
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