Configuring IP Distributed ARP
OmniSwitch AOS Release 8 Network Configuration Guide December 2017 page 15-18
To view the designated-NI for the interface, use the show ip interface command. For example:
-> show ip interface 15
Interface Name = 15
SNMP Interface Index = 13600001,
IP Address = 15.2.2.1,
Subnet Mask = 255.255.255.0,
Broadcast Address = 15.2.2.255,
Device = vlan 215,
Encapsulation = eth2,
Forwarding = enabled,
Administrative State = enabled,
Operational State = up,
Maximum Transfer Unit = 1500,
Designated ARP NI = 3/1,
ARP Count = 1,
Router MAC = e8:e7:32:8d:9b:b1,
Local Proxy ARP = disabled,
Primary (config/actual) = no/yes
For more information about the displays that result from these commands, see the OmniSwitch AOS
Release 8 CLI Reference Guide.
Distributed ARP Management Example
Due to the hashing algorithm used for Distributed ARP, the more VLANs, IP interfaces, and physical
ports configured will result in less hashing collisions and a higher total number of ARPs that can be
learned.
Below are some example distributed ARP configurations resulting in the maximum number of ARPs
learned. Please refer to the “Network Configuration Specifications” chapter in the OmniSwitch AOS
Release 8 Specifications Guide for the ARP specifications for each chassis.
Distributed ARP Example Configurations
• Attempt to keep VLANs with a large amount of routed traffic between them consolidated on the same
designated NI to help reduce traffic flow over the VFL.
• To make a specific NI the designated NI put active ports and VLANs on that NI only.
VC Configuration VLANs
Configured
ARPs per
VLAN
Total ARPs
learned
ARPs per chassis
learned
VC of 6 (Mix of Q32
and X72
24 8K 192K 32K
(maximum 192K
ARPs reached)
VC of 2 (Q32/X72) 36 1K through 5K 96K 48K
VC of 2 (X72/X40) 36 1K through 5K 56K 48K - X72
8K - X40
VC of 6 (Q32, Q32,
Q32, X40, X20, X20)
20 19 VLANs- 8K
1 VLAN - 16K
168K 48K - Q32
8K - X20/40
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