Configuration Guide User guide

1966 FastIron Configuration Guide
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QoS overview
Figure 221 on page 1967 illustrates how the SX-FI48GPP interface module determines the trust
level of a packet. The marking process for the SX-FI48GPP interface module is similar to the
marking process for other FastIron SX modules. However, there are major differences between the
SX-FI48GPP interface module and other FastIron SX modules.
• For the SX-FI48GPP interface module, static MAC priority takes higher precedence than VLAN
priority. For other FastIron SX modules, VLAN priority takes higher precedence over static MAC
priority.
• For other FastIron SX modules, the priority of the dynamically learned MAC address is inherited
from the default port priority. For the SX-FI48GPP interface module, the priority of the
dynamically learned MAC address is not inherited from the default port priority because it is
not desirable to allow the port priority to take precedence over the VLAN priority. All
dynamically learned MAC addresses are assigned a priority of 0 in the SX-FI48GPP interface
module. Therefore, configuring a static MAC with a priority of 0 has no effect on QoS marking.