Blade ICE G8124-E Manuale Utente

BMD00220, October 2010

Chapter 14: FCoE and CEE  

  209

If PGID 15 has low traffic levels, most of the switch’s bandwidth will be available to serve priority 
groups 0 through 7. However, if PGID 15 consumes a larger part of the switch’s total bandwidth, 
the amount available to the other groups is reduced.

Consider traffic load when assigning priority values to PGID 15. Heavy traffic in this group 

may restrict the bandwidth available to other groups.

Consider an example consistent with that used for port-based PFC configuration (on 

The example shown in 

 is only slightly different than the default configuration shown in 

. In this example, latency-sensitive LAN traffic (802.1p priority 5 through 6) 

are moved from priority group 4 to priority group 5. This leaves Business Critical LAN traffic 
(802.1p priority 4) in priority group 4 by itself. Also, a new group for network management traffic 
has been assigned. Finally, the bandwidth allocation for priority groups 3, 4, and 5 are revised.

DCBX may be configured to permit sharing or learning PFC configuration with or from 

external devices. This example assumes that PFC configuration is being performed manually. See 

 for more information on DCBX.

ETS Configuration

0

LAN (best effort delivery)

2

10%

1

LAN (best effort delivery)

2

LAN (best effort delivery)

3

SAN (Fibre Channel over Ethernet, with PFC)

3

20%

4

Business Critical LAN (lossless Ethernet, with PFC)

4

30%

5

Latency-sensitive LAN

5

40%

6

Latency-sensitive LAN

7

Network Management (strict)

15

unlimited