Nortel business policy switch 2000, User Manual

Page: 296 / 412

296 Chapter 4 Policy-enabled networks
208700-C
Table 58 shows the default guidelines the switch uses to re-mark various fields of
IP traffic (and layer 2 traffic matching IP) based on the class of the interface.
These are the actions that occur if the user does not intervene at all; they are the
default actions of the switch.
IEEE 802.1p Cannot re-mark • Tagged—Must re-mark
• Untagged—Cannot
re-mark
Re-mark or not
Drop precedence Cannot re-mark • Tagged—Must re-mark
• Untagged—Cannot
re-mark
Re-mark or not
Table 58 Default with no user action re-marking of QoS fields by class of interface--IP only
Type of filter Action Trusted Untrusted Unrestricted
IP filter or
Layer 2 filter
matching IP 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 Internally updates • Tagged—Updates to 0
• Untagged—Updates to
port’s default value
Does not change
Drop precedence Internally updates Updates to high drop
precedence Does not change
Note:
The default for layer 2 non-IP traffic is to pass the traffic through
all interface classes with the QoS values for 802.1p and drop precedence
unchanged.
Table 57 Possible user re-marking of QoS fields by class of interface
Type of filter Action Trusted Untrusted Unrestricted