Effects on 802.1p quality of service – Blade ICE RACKSWITCH G8124-E User Manual
Page 193
BLADEOS 6.5.2 Application Guide
BMD00220, October 2010
Chapter 14: FCoE and CEE 193
Effects on 802.1p Quality of Service
While CEE is off (the default), the G8124 allows 802.1p priority values to be used for Quality of
Service (QoS) configuration (see
). 802.1p QoS default settings are shown in
, but
can be changed by the administrator.
When CEE is turned on, 802.1p QoS is replaced by ETS (see
“Enhanced Transmission Selection”
). As a result, while CEE is turned on, the 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
:
When CEE is on, the default ETS configuration also allocates a portion of link bandwidth to each
PGID as shown in
:
Table 16
CEE Effects on 802.1p Defaults
802.1p QoS Configuration
With CEE Off (default)
ETS Configuration
With CEE On
Priority
COSq
Weight
Priority
COSq
PGID
0
0
2
0
2
2
1
0
2
1
2
2
2
0
2
2
2
2
3
0
2
3
3
3
4
1
4
4
4
4
5
1
4
5
4
4
6
1
4
6
4
4
7
1
4
7
7
15
Table 17
Default ETS Bandwidth Allocation
PGID
Typical Use
Bandwidth
2
LAN
10%
3
SAN
50%
4
Latency-sensitive LAN
40%