Link Aggregation on the Switch
ExtremeWare XOS 11.3 Concepts Guide
121
Link Aggregation Algorithm on the BlackDiamond 8800 Family of Switches and the
Summit X450 Switch
NOTE
You cannot configure port-based load sharing on the BlackDiamond 8800 family of switches or the Summit X450
switch.
Address-based load sharing. When you configure address-based load sharing, the switch examines a
specific place in the packet to determine which egress port to use for forwarding traffic:
â—Ź For Layer 2 load sharing, the switch uses the MAC source address and destination address.
â—Ź For Layer 3 load sharing, the switch uses the IP source address and destination address.
You control the field examined by the switch for address-based load sharing when the load-sharing
group is created by using the following command:
enable sharing {<master_port>} group
ing <port_list> {algorithm addre
ss-based [L2 |
L3]}
If the packet is not IP, the switch applies the Layer 2 algorithm, which is the default setting.
Link Aggregation Algorithms on the BlackDiamond 10K Switch
You can configure one of two load-sharing, or link aggregation, algorithms on the BlackDiamond 10K
switch, as follows:
● Port-based—Uses the ingress port to determine which physical port in the load-sharing group is
used to forward traffic out of the switch.
● Address-based—Uses addressing information to determine which physical port in the load-sharing
group to use to forward traffic out of the switch. Addressing information is based on the packet
protocol, as follows:
■IP packets—Uses the source and destination MAC and IP addresses and the TCP port number.
■All other packets—Uses the source and destination MAC address.
If you do not explicitly select an algorithm, the port-based scheme is used. However, the address-based
algorithm has a more even distribution and is the recommended choice.
Address-based load sharing. When you configure address-based load sharing, the switch examines a
specific place in the packet to determine which egress port to use for forwarding traffic:
â—Ź For Layer 2 load sharing, the switch uses the MAC source address and destination address.
â—Ź For Layer 3 load sharing, the switch uses the IP source address and destination address.
â—Ź For Layer 4 load sharing, the switch using the TCP source and destination port number.
You can control the field examined by the switch for address-based load sharing by using the following
command:
configure sharing address-based [L2 | L2_L3 | L2_L3_L4 | L2_L3_CHK_SUM |
L2_L3_L4_CHK_SUM]
where CHK SUM indicates that the switch should examine the IP check sum. Examining the IP check
sum in addition to the other parameters produces a random traffic pattern on the egress of the load-
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