Effects On 802.1P Quality Of Service - Lenovo RackSwitch G8264CS Application Manual

Effects on 802.1p Quality of Service

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While CEE is off (the default), the G8264CS allows 802.1p priority values to be used
for Quality of Service (QoS) configuration (see page
settings are shown in Table
When CEE is turned on, 802.1p QoS is replaced by ETS (see "Enhanced
Transmission Selection" on page
802.1p QoS configuration commands are no longer available on the switch (the
menu is restored when CEE is turned off).
In addition, when CEE is turned on, prior 802.1p QoS settings are replaced with
new defaults designed for use with ETS priority groups (PGIDs) as shown in
Table 24:
Table 24.
CEE Effects on 802.1p Defaults
802.1p QoS Configuration
With CEE Off (default)
Priority- COSq
0 0
1 1
2 2
3 3
4 4
5 5
6 6
7 7
When CEE is on, the default ETS configuration also allocates a portion of link
bandwidth to each PGID as shown in Table
Table 25.
Default ETS Bandwidth Allocation
PGID Typical Use
0 LAN
1 SAN
2 Latency‐sensitive
LAN
If the prior, non‐CEE configuration used 802.1p priority values for different
purposes, or does not expect bandwidth allocation as shown in Table 25 on
page 303, when CEE is turned on, have the administrator reconfigure ETS settings
as appropriate.
24, but can be changed by the administrator.
313). As a result, while CEE is turned on, the
Weight Priority
1 0
2 1
3 2
4 3
5 4
7 5
15 6
0 7
25:
Bandwidth
10%
50%
40%
223). 802.1p QoS default
ETS Configuration
With CEE On
COSq PGID
0 0
0 0
0 0
1 1
2 2
2 2
2 2
2 2
Chapter 17: FCoE and CEE
303