Mode of operation Ethertype
(hex. value)
QoS CQS QoS_osub Ingress rate control HoL blocking
prevention
VPN
mode
LAN
interconnect
[0xFFFF] [disabled] [disabled] [none] [disabled]
LAN-VPN [0xFFFF] [disabled] [enabled] strict policing [enabled]
oversubscription
LAN-VPN with
QoS
This mode of operation was supported in previous releases. However, it is no longer supported
in the 1643 AM Release 1.0 through 7.2
IEEE
mode
STP virtual
switch mode
compliant with
IEEE 802.1Q
0x8100 [enabled] disabled strict policing [enabled]
enabled strict policing,
oversubscription
STP virtual
switch mode
compliant with
IEEE 802.1ad
(Provider bridge
mode)
0x0601 { 0xFFFF
(≠ 0x8100)
[enabled] enabled strict policing,
oversubscription
[enabled]
Notes:
1. QoS CQS: Quality of Service - Classification, Queueing, and Scheduling
2. “QoS_osub” represents a configuration parameter which determines if the encoding and evaluation of the
dropping precedence is supported (supported if QoS_osub is enabled).
3. Entries in square brackets indicate an implicit selection. If in the “QoS CQS” column for example the
entry is “[disabled]”, then the preceding selection of tagging and operation mode implies that Quality of
Service - Classification, Queueing, and Scheduling (QoS CQS) is not available. It is implicitly disabled,
and cannot be enabled.
4. The Ethertype can be set per virtual switch. However, as all virtual switches of a TransLAN
®
card are
switched in common, it is effectively set per TransLAN
®
card.
5. The distinction between the STP virtual switch mode compliant with IEEE 802.1Q and the STP virtual
switch mode compliant with IEEE 802.1ad (provider bridge mode) can be realized by provisioning the
Ethertype. In the STP virtual switch mode compliant with IEEE 802.1Q, the Ethertype is fix preset to
0x8100. In the provider bridge mode, the Ethertype can be provisioned in the range 0x0600 { 0xFFFF,
but unequal to 0x8100.
6. If “HoL blocking prevention” is enabled then frames that are destined for an uncongested port will not be
discarded as a result of head-of-line blocking.
Ingress rate control provisioning method
IQuality of Service - Classification, Queueing, and Scheduling (QoS CQS) is enabled,
then ingress rate control can be provisioned per flow by using QoS profiles (see
“Quality of Service provisioning” (p. 8-94)). Otherwise,ingress rate control can only be
provisioned per port.
Traffic provisioning
Quality of Service (QoS) overview
....................................................................................................................................................................................................................................
365-312-807R7.2
Issue 4, May 2007
Alcatel-Lucent - Proprietary
See notice on first page
8-83
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