Configuring Multi-chassis Link Aggregation Interaction with Other Features
OmniSwitch AOS Release 7 Network Configuration Guide June 2013 page 10-23
High Availability VLANs
• The High Availability VLAN (HAVLAN) configuration must be the same on both MCLAG peer
switches. Enhancements to the HAVLAN show commands provide information to determine the status
of a HAVLAN consistency check between the two multi-chassis peer switches, the reason for any
inconsistency detected, and if the VFL link is in use by the server cluster.
• When the HAVLAN configuration and MCLAG configuration are both up and running, the HAVLAN
feature performs a consistency check to verify that the server cluster configuration is the same on both
MCLAG peer switches.
• If the server cluster is not operationally up on both peer switches, then the server cluster configuration
is only applicable to the local switch. In this case, an HAVLAN consistency check is not started.
• In the case of an L3 server cluster, the VLAN used for the IP interface must exist on both peer switches
and must also be a VIP VLAN.
• An SNMP trap notification is sent when the HAVLAN consistency check detects a synchronization
error between the two peer switches (server cluster configuration does not match on both peers).
Universal Network Profiles
• The Universal Network Profile (UNP) configuration must be the same on both MCLAG peer switches.
Any inconsistencies in the configuration between the two switches could affect the traffic flow, espe-
cially in a failover scenario. Enhancements to the UNP show commands provide information that indi-
cates the status of a UNP consistency check between the two multi-chassis peer switches.
• When UNP detects that the MCLAG configuration is up and operational, UNP performs a consistency
check to verify that the UNP configuration is the same on both multi-chassis peer switches. The
following conditions will also trigger a consistency check:
> If there is any change to the UNP configuration.
> If the MCLAG operation goes down and comes back up.
• To help further avoid any inconsistencies related to the UNP configuration, make sure that the VLAN
configuration and the QoS policy list rule configuration are both the same on each peer switch. UNP
does not check the VLAN configuration and only checks for the same QoS policy list name, but
doesn’t detect the actual rules assigned to that list.
• The following table provides a list of UNP-related commands, whether or not the command is part of
the mandatory configuration required on the local and peer switch, and a brief description of the
MCLAG impact if there is a configuration mismatch involving these commands:
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