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You also have the following options for determining the service-tag action P-bit for services
provisioned on xDSL ports:
Specify the P-bit value explicitly.
Enter the P-bit value to use for P-bit marking the outer tag.
Reference a Layer-3 Priority map.
Use a DSCP table or an IP Precedence table to map to a P-bit value. From the xDSL
port associated interface, you can select to use the system-default profiles ("access") or
specify another custom profile. See
Layer 3 Priority to P-Bit Mapping
(on page
96
).
Only one service per port can use DSCP-Bit mapping function.
Works with Add-Tag and Add-2-Tags tag actions.
Either DSCP or IP Precedence can be used for a service, not both.
Provisioning sequence:
a.
Create a
DSCP-to-P-Bit map
(on page
98
) or create an
IP Precedence to P-Bit Mask
(on
page
100
), if you do not want to use the system-default.
b.
Assign the map to the
xDSL port associated interface
(on page
182
), or leave the system-
default map "access" assignment.
c.
Create a service-tag action with an Outer P-Bit Source of
Map a layer-3 Priority
.
d.
Create a service using the defined service-tag action.
Preserve the existing P-bit value upstream.
Indicate that the E-Series preserves the P-bit value set in service provider-supplied CPEs
by specifying a P-bit value of "copy."
Note:
The upstream traffic on a service VLAN must have the same priority value as is
set for downstream traffic.
The table shows 802.1p to DiffServ DSCP system-default mapping table ("access").
Default
P-bits
IP Precedence
DiffServ Code Point**
Service
0
7
CS6, CS7 (48-56)
Network control
0
6
EF (46)
Voice, NSP, CES
5
5
CS5 (40)
Network Management
4
4
CS4 & AF41-43 (32-38)
Video
3
3
CS3 & AF31-33 (24-30)
Data3
2
2
CS2 & AF21-23 (16-22)
Data2
1
1
CS1 & AF11-13 (8-14)
Data1
0
0
0
Best Effort
**The E-Series supports alphanumeric DSCP values that denote forwarding classes such as AF21, AF31 in addition to
numeric value assignment.
