User guide

September 2009
Page 16 of 79 OmniSwitch 6400/6850/6855/9000/9000E—Release 6.4.2.R01
Default Hashing Mode and Recommendations
Platform Default Hashing Mode
9000/9000E Extended
6400/6850/6855 Brief
• Changing the hash mode affects all features that rely on hashing, including Link Aggregation, ECMP
and Server Load Balancing. Changing the hash mode per feature is not supported.
• Server Load Balancing uses dynamic port assignment, therefore it is not recommended to enable the
TCP/UDP port hashing option with extended mode when SLB is configured on the switch.
• The hash control mode also impacts the fabric load balancing for chassis-based products. It is not
recommended to set brief hashing mode on chassis-based products.
Source Learning
Disable Learning on a per port basis
Provides the option to disable source learning on a per port basis. This feature is only supported on
“hardware learning” ports and is not supported on mobile ports, LPS ports or Access Guardian ports.
The feature is also supported for Link Aggregation where all ports in the aggregate are set to disable
source learning. Configuration of static mac-addresses on such ports is still allowed.
Disable MAC learning on a per VLAN basis
Provides the option to disable source learning for all the ports of a VLAN. This feature is meant to be
used on a ring topology where a VLAN only contains two ports.
It is recommended to have only 2 ports in a VLAN that has source learning disabled.
Multiple Virtual Routing and Forwarding (Multiple-VRF)
VRF - Qos Enhancements
Enhances QoS policy configuration by adding a field in the policy condition to allow a VRF instance to
be specified. The VRF classification can be combined with any existing condition and allows for the
configuration of VRF aware policy rules.
VRF - Switch Authentication Enhancement
This feature allows a RADIUS server to be placed in a VRF other than the default VRF. This allows
for the creation of a Management VRF instance where all authentication servers can be placed.
Authentication servers may also be left in the non-default VRF instance.
VRF - Switch Access and Utilities
Enhances Telnet and SSH to make them VRF aware. This feature applies only to outgoing Telnet and
SSH connections from any VRF instance, incoming requests always go to the default VRF instance.
Additionally, the ping and traceroute utilites are also VRF aware.