H3C Technologies H3C S6800 Series Switches - Manual (Page 11)

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• Physical ports.
• Logical ports.
• Reserved ports of the Local type.
In loosen mode, a port belongs to the OpenFlow instance when VLANs associated with the OpenFlow
instance overlap with the port's allowed VLANs. Otherwise, a port belongs to an OpenFlow instance
only when VLANs associated with the OpenFlow instance are within the port's allowed VLAN list.
OpenFlow flow table
An OpenFlow switch matches packets with one or more user-defined flow tables. A flow table contains
flow entries, and packets are matched based on the matching precedence of flow entries.
OpenFlow flow tables include the following types:
• MAC-IP—Combines the MAC address table and FIB table.
A MAC-IP flow table provides the following match fields:
{
Destination MAC address.
{
VLAN.
{
Destination IP address.
A MAC-IP flow table provides the following actions:
{
Modifying the destination MAC address.
{
Modifying the source MAC address.
{
Modifying the VLAN.
{
Specifying the output port.
• Extensibility—Combines Ternary Content Addressable Memory (TCAM) tables and tables
programmed by software. An extensibility flow table provides more match fields and actions than
a MAC-IP flow table, such as destination MAC address, destination IP address, VLAN priority, TCP
source port, and TCP destination port.
Flow entry
Figure 2 Flow entry components
A flow entry contains the following fields:
• Match fields—Matching rules of the flow entry. These contain the ingress port, packet headers, and
metadata specified by the previous table.
• Priority—Matching precedence of the flow entry. When a packet is matched with the flow table,
only the highest priority flow entry that matches the packet is selected.
• Counters—Counts of the packets that match the flow entry.
• Instructions—To modify the action set or pipeline processing. These include the following types:
{
Meter—Directs the packets to the specified meter to rate-limit the packets.
{
Apply-Actions—Applies the specified actions in the action list immediately.
{
Clear-Actions—Clears all actions in the action set immediately.
{
Write-Actions—Modifies all actions in the action set immediately.