ZyXEL Communications XS-3900-48F User Manual page 20

Chapter 1 Getting to Know Your Switch
• 0, 1 and 2 to traffic class 2 (LAN)
• 3, 4, 5 and 6 to ID 1 (SAN)
• 7 to 0, the default traffic class.
If there is network congestion, bandwidth can be allocated based on the priority of the traffic
received on that port.
Table 4 Bound Traffic Priorities
PRIORITY
0
1
2
3
4
5
6
7
PFC
• Estimate what traffic types are likely to cause network congestion and configure PFC with these
associated priorities. For example, if SAN traffic is likely to cause congestion, then configure PFC
with priorities 3, 4, 5, 6. It's better if the connected peer switch has the same configured
priorities.
1.2.2.2 DCB with DCBX
Do the following if you're using DCB with DCBX, that is, switches need to know each other's PFC,
ETS and application priority information.
• Enable transmission and reception of LLDP PDUs (Protocol Data Unit) on a port using lldp
admin-status tx-rx.
• Enable TLV (Type-Length-Value) transmission of formats so that switches can read each others
ETS, PFC and application priority information sent via LLDP PDUs.
• Configure ETS as outlined in the previous section.
• Configure application priority for all FCoE traffic on the Switch.
20
TRAFFIC CLASS ID NAME
2 LAN
2 LAN
2 LAN
1 SAN
1 SAN
1 SAN
1 SAN
0 Default
XS3900-48F User's Guide