System Information Commands
Page 326 7750 SR OS Basic System Configuration Guide
enable-icmp-vse
Syntax [no] enable-icmp-vse
Context config>system
Description This command enables vendor specific extensions to ICMP.
l4-load-balancing
Syntax [no] l4-load-balancing
Context config>system
Description This command configures system-wide Layer 4 load balancing. The configuration at system level can
enable or disable load balancing based on Layer 4 fields. If enabled, Layer 4 source and destination
port fields will be included in hashing calculation for TCP/UDP packets.
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:
If [(TCP or UDP traffic) & enabled]
hash (<TCP/UDP ports>, <IP addresses>)
else if (IP traffic)
hash (<IP addresses>)
else
hash (<MAC addresses>)
endif
This algorithm will be applied to all packets received on network and access ports (Layer 2 and Layer
3) with two exceptions
• MPLS LSR switched packets will be load balanced using a hash of the label stack, incoming
port, and system IP address.
• Packets of point-to-point services (Epipe) will be hashed based on the service ID.
Use of Layer 4 information (TCP/UDP ports) will not be used in following cases:
• Fragmented packets.
• Packets received from a VPRN tunnel.
Default no l4-load-balancing
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