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IXP400 Software
Access-Layer Components: Ethernet Database (IxEthDB) API
April 2005 IXP400 Software Version 2.0 Programmer’s Guide
172 Document Number: 252539, Revision: 007
At initialization, a default traffic class mapping is provided, as shown Table 29. These values apply
to NPE images that include four default traffic classes. When using NPE images that provide a
larger number of priority queues, the values may differ.
Some NPE images will not provide the four IxQMgr queues that would allow the priority to traffic
class mapping mentioned above. A header file is provided (/src/include/IxEthDBQoS.h)
that defines the number of queues available for QoS processing in various NPE images, and
provides the traffic class mapping default values.
10.3.6 802.3 / 802.11 Frame Conversion
The NPEs are capable of converting between IEEE 802.3 Ethernet and IEEE 802.11 wireless frame
formats. IxEthDB provides support for configuring these NPE capabilities. Specific NPE
microcode images are required to enable 802.3/802.11 conversion, and this feature is mutually
exclusive with the MAC Address Filtering feature. Each NPE supporting this feature can have a
unique 802.3 / 802.11 conversion configuration.
10.3.6.1 Background — 802.3 and 802.11 Frame Formats
The 802.3 frame format is shown in Figure 56 and Figure 57. The 802.11 frame format is shown in
Table 30.
Table 29. Default Priority to Traffic Class Mapping
VLAN TCI Priority Field Internal Traffic Class
01
10
20
31
42
52
63
73
Table 30. IEEE802.11 Frame Format
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
FC DID Address1 Address2 Address3 SC Address4
Frame Body
(0–2312
bytes)
FCS