Extreme Networks ExtremeWare XOS Guide Manual page 88

Configuring Slots and Ports on a Switch
You can 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>} grouping <port_list> {algorithm address-based [L2 |
L3]}
or
by using the following command after the load-sharing group has been created:
configure sharing {<master_port>} algorithm address-based [L2 | L3]
If the packet is not IP, the switch applies the Layer 2 algorithm, which is the default setting.
Load-Sharing 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:
For Layer 2 load sharing, the switch uses the MAC source address and destination address.
●
For Layer 3 load sharing, the switch uses the IP source address and destination address.
●
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-
sharing links because the IP check sum includes the packet length, which is likely to change from
packet to packet.
This feature is available for the address-based load-sharing algorithm only. The selected address-based
algorithm is applied to the entire switch, to all the load-sharing groups configured as address-based.
Layer 2 is the default setting.
The master port of the load-sharing group can be the monitor port for port-mirroring.
ExtremeWare XOS 11.1 Concepts Guide
88