Alcatel-Lucent 7750 SR OS Interface Configuration Manual page 340

Configuration Commands
The hashing algorithm addresses finer spraying granularity where many hosts are connected to the
network. To address more efficient traffic distribution between network links (forming a LAG
group), a hashing algorithm extension takes into account L4 information (i.e., src/dst L4-protocol
port).
The hashing index can be calculated according to the following algorithm:
This algorithm will be used in all cases where IP information in per-packet hashing is included (see
LAG and ECMP Hashing on page
Use of Layer 4 information (TCP/UDP ports) will not be used in following cases:
Default no load-balancing-algorithm
Parameters
option — Specifies the load balancing algorithm to be used on this port.
pbb-etype
Syntax pbb-etype [0x0600..0xffff]
no pbb-etype
Context config>port>ethernet
Default
0x88E7
Description
This command configures the Ethertype used for PBB encapsulation.
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• include-l4 — Enables inherits system-wide settings including Layer 4 source and destination
port value in hashing algorithm.
• exclude-l4 — Layer 4 source and destination port value will not be included in hashing.
• no load-balancing-algorithm — Inherits system-wide settings.
If [(TCP or UDP traffic) & enabled]
hash (<TCP/UDP ports>, <IP addresses>)
else if (IP traffic)
hash (<IP addresses>)
else
hash (<MAC addresses>)
endif
• Fragmented packets
• Packets received from a VPRN tunnel.
• Fragmented packets.
• Packets received from a VPRN tunnel.
Values include-l4 — Specifies that the source and destination ports are used in the hashing
algorithm.
exclude-l4 — Specifies that the source and destination ports are not used in the
hashing algorithm.
104) except in the following cases:
7750 SR OS Interface Configuration Guide