Avaya ERS 5510 - Table 1: Default Qos Action

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Filters and QOS Configuration for Ethernet Routing Switch 5500
Technical Configuration Guide
8
January 2013
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is not remarked by default. However, a policy can still be applied to a trusted port to remark if
required. Note that only the 802.1p user priority value associated with „well-known‟ DSCP
values are remapped by the default trusted polices. The „well-know‟ DSCP values can be
viewed by using the ACLI command „show qos eqressmap‟.
Untrusted Ports
o Assumes that all traffic coming into the port is suspect. Therefore, the DSCP field of any
traffic that enters the Ethernet Routing Switch 5500 from an Untrusted Port is re-marked. For
untagged packets, the default classifier is used to change the DSCP. This results in a DSCP
value determined by the CoS-to-DSCP mapping table using the default 802.1p priority of the
interface where the packet is received. For tagged packets, the 802.1p value is determined
by CoS-to-DSCP mapping table using the best effort DSCP, which is 0.
Unrestricted Ports
o Does not assume anything about the origin of the incoming traffic. You may assign an action
to set the DSCP or not to set the DSCP; it's up to you. This allows you to manipulate the
DSCP value based upon the filter criteria, and not upon the point of origin.
The following table displays a summary of the role combination capabilities.
Table 1: Default QoS Action
Type of Filter
Action
Trusted
Untrusted
Unrestricted
IPv4 filter criteria
or Layer 2 filter
criteria matching
IPv4
DSCP
Does not
change
Tagged--Updates to 0
(Standard)
Untagged--Updates using
mapping table and port‟s
default value
Does not
change
IEEE
802.1p
Updates
based on
DSCP
mapping
table value
Updates based on DSCP
mapping table value
Does not
change
Classification
Classification identifies the traffic flow that requires QoS management. The traffic flow may be identified
by the Layer 2 or IP content of the frame using any of the elements shown below.
 Layer 2 Classifier Elements
o Source MAC with mask to filter on complete or partial MAC addresses
o Destination MAC with mask to filter on complete or partial MAC addresses
o VLAN ID – can be a range
o Tagged or untagged packets
o EtherType
o 802.1p priority