Priority-based Flow Control Configuration
This chapter shows how to:
• Enable PFC on a bridge and interface
• Configure priorities and link delay allowance for PFC
Topology
PFC Enabled Bridge
Configuring a Bridge and Interface for PFC
#configure terminal | Enter configure mode |
(config)#bridge 1 protocol ieee vlan-bridge | Create bridge 1 as an IEEE VLAN-enabled bridge |
(config)#data-center-bridging enable bridge 1 | Enables DCB on the bridge |
(config)#priority-flow-control enable bridge 1 | Enables PFC on the bridge |
(config)#interface eth1 | Configure interface eth1 |
(config-if)#switchport | Configure eth1 as a layer 2 port |
(config-if)#bridge-group 1 | Configure eth1 in bridge group 1 |
(config-if)#lldp-agent | Enter into LLDP agent mode. |
(lldp-agent)#set lldp enable txrx | Configure LLDP for transmit and receive mode on eth1 |
(lldp-agent)#lldp tlv ieee-8021-org-specific data-center-bridging select | Configure LLDP to send an IEEE 802.1 organizationally specific TLV set in the packet |
(lldp-agent)#exit | Exit from LLDP mode. |
(config-if)#priority-flow-control mode on | Configure the advertise flag and start sending DCBX TLVs in LLDP messages |
Configuring Priorities and Link Delay Allowance for PFC
#configure terminal | Enter Configure Mode. |
(config)#bridge 1 protocol ieee vlan-bridge | Create bridge 1 as an IEEE VLAN-enabled bridge |
(config)#data-center-bridging enable bridge 1 | Enables DCB on the bridge |
(config)#priority-flow-control enable bridge 1 | Enables PFC on the bridge |
(config)#interface eth1 | Configure interface eth1 |
(config-if)#switchport | Configure eth1 as a layer 2 port |
(config-if)#bridge-group 1 | Configure eth1 in bridge group 1 |
(config-if)#lldp-agent | Enter into LLDP agent mode. |
(lldp-agent)#set lldp enable txrx | Configure LLDP for transmit and receive mode on eth1 |
(lldp-agent)#llldp tlv ieee-8021-org-specific data-center-bridging select | Configure LLDP to send an IEEE 802.1 organizationally specific TLV set in the packet |
(lldp-agent)#exit | Exit from LLDP mode. |
(config-if)#priority-flow-control mode on | Configure the advertise flag and start sending DCBX TLVs in LLDP messages |
(config-if)#priority-flow-control cap 4 | Configure the maximum number of PFC priorities |
(config-if)#priority-flow-control enable priority 2 4 5 | Enable PFC on priorities 2, 4, and 5 |
(config-if)#priority-flow-control link-delay-allowance 34567 | Configure the link delay allowance |
Validation
1. Verify the default data set.
#sh priority-flow-control statistics bridge 1
bridge : 1
interface pri pause sent pause received
===========================================
eth1 0 00 00
eth1 1 00 00
eth1 2 00 00
eth1 3 00 00
eth1 4 00 00
eth1 5 00 00
eth1 6 00 00
eth1 7 00 00
#sh priority-flow-control details bridge 1
Admin Configuration
interface mode advertise willing cap link delay priorities allowance
==============================================================================
eth1 on on off 4 34567 2 4 5
Operational Configuration
-------------------------
interface state cap link delay priorities allowance
===============================================
eth1 on 4 34567 2 4 5