Configuration Guide Vol. 1

21.1.5 Port sorting when sending frames

When link aggregation is used to send frames, to ensure efficient port use, a port is allocated for each frame to distribute the traffic to ports. Ports are allocated based on the information in the frames.

The following table describes the information used for port allocation.

Table 21-1: Port allocation when sending frames (1/2)

Forward

Frame type

Information used for port allocation

port-channel load-balance parameter

src-mac

dst-mac

src-dst-mac

src-ip

src-port

Layer 3 forwarding

IP unicast

IP broadcast

Destination MAC address

-

OK

OK

-

-

Source MAC address

OK

-

OK

-

-

Reception VLAN

OK

OK

OK

-

-

EtherType

OK

OK

OK

-

-

Destination IP address

-

-

-

-

-

Source IP address

-

-

-

OK

OK

Destination TCP/UDP port number

-

-

-

-

-

Source TCP/UDP port number

-

-

-

-

OK

IP multicast

Destination IP address

OK

OK

OK

OK

OK

Source IP address

OK

OK

OK

OK

OK

Receive port number or receive channel group number

OK

OK

OK

OK

OK

Layer 2 forwarding

Frame for which the MAC address has not been learned yet

(unicast, broadcast, and multicast frames)

Destination MAC address

OK

OK

OK

OK

OK

Source MAC address

OK

OK

OK

OK

OK

Reception port number or

reception channel group number

OK

OK

OK

OK

OK

IP frame for which the MAC address has been learned

Destination MAC address

-

OK

OK

-

-

Source MAC address

OK

-

OK

-

-

VLAN

OK

OK

OK

-

-

EtherType

OK

OK

OK

-

-

Destination IP address

-

-

-

-

-

Source IP address

-

-

-

OK

OK

Destination TCP/UDP port number

-

-

-

-

-

Source TCP/UDP port number

-

-

-

-

OK

Non-IP frame for which the MAC address has been learned

Destination MAC address

-

OK

OK

-

-

Source MAC address

OK

-

OK

OK

OK

VLAN

OK

OK

OK

OK

OK

EtherType

OK

OK

OK

OK

OK
Table 21-2: Port allocation when sending frames (2/2)

Forward

Frame type

Information used for port allocation

port-channel load-balance parameter

dst-ip

dst-port

src-dst-ip

src-dst-port

Layer 3 forwarding

IP unicast

IP broadcast

Destination MAC address

-

-

-

-

Source MAC address

-

-

-

-

Reception VLAN

-

-

-

-

EtherType

-

-

-

-

Destination IP address

OK

OK

OK

OK

Source IP address

-

-

OK

OK

Destination TCP/UDP port number

-

OK

-

OK

Source TCP/UDP port number

-

-

-

OK

IP multicast

Destination IP address

OK

OK

OK

OK

Source IP address

OK

OK

OK

OK

Receive port number or receive channel group number

OK

OK

OK

OK

Layer 2 forwarding

Frame for which the MAC address has not been learned yet

(unicast, broadcast, and multicast frames)

Destination MAC address

OK

OK

OK

OK

Source MAC address

OK

OK

OK

OK

Reception port number or

reception channel group number

OK

OK

OK

OK

IP frame for which the MAC address has been learned

Destination MAC address

-

-

-

-

Source MAC address

-

-

-

-

VLAN

-

-

-

-

EtherType

-

-

-

-

Destination IP address

OK

OK

OK

OK

Source IP address

-

-

OK

OK

Destination TCP/UDP port number

-

OK

-

OK

Source TCP/UDP port number

-

-

-

OK

Non-IP frame for which the MAC address has been learned

Destination MAC address

OK

OK

OK

OK

Source MAC address

-

-

OK

OK

VLAN

OK

OK

OK

OK

EtherType

OK

OK

OK

OK

(Legend) OK: Sort by-: Not for sorting

Select an appropriate allocation method according to the traffic on the link aggregation to perform efficient load balancing. For example, if sending IP frames to multiple MAC addresses from a host with a single MAC address, you can allocate sending ports more efficiently by selecting the dst-mac method instead of selecting the src-mac method.

<>Port Allocation in Stack Configuration

For details about port allocation in stack configuration, see 7.6.2 Transfer operations for link aggregation.

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