Interaction With Other Features Configuring VLAN Stacking
page 6-10 OmniSwitch 6800/6850/9000 Network Configuration Guide March 2008
Link Aggregation
• Both static and dynamic link aggregation are supported with service-based and port-based VLAN
Stacking. The exception to this is that port-VLAN level VLAN Stacking on a static link aggregate of
UNI ports is not supported.
• Note that in both VLAN Stacking modes, a link aggregate must consist of all UNI or all NNI ports.
VLAN Stacking functionality is not supported on link aggregates that consist of a mixture of VLAN
Stacking ports and conventional switch ports.
Quality of Service (QoS)
The QoS application has the following interactions with service-based VLAN Stacking, except where
otherwise noted:
• QoS allocates switch resources for VLAN Stacking Service attributes, even though such attributes are
not configurable via the QoS CLI.
• VLAN Stacking ports are trusted and use 802.1p classification by default.
• If there is a conflict between VLAN Stacking Service attributes and the QoS configuration, the VLAN
Stacking attributes are given precedence over QoS policies.
• QoS applies the inner source vlan and inner 802.1p policy conditions to the CVLAN (inner) tag of
both service-based and port-based VLAN Stacking packets.
• QoS applies the source vlan and 802.1p policy conditions to the SVLAN (outer) tag of both service-
based and port-based VLAN Stacking packets.
• Quarantine Manager and Remediation (QMR) is not available if VLAN Stacking services or QoS
inner source vlan and inner 802.1p policies are configured on the switch.
See “Configuring QoS Priority Parameters for SVLANs” on page 6-30 for information about QoS interac-
tion with port-based (legacy mode) VLAN Stacking.
Ring Rapid Spanning Tree Protocol (RRSTP)
• RRSTP is only supported on VLAN Stacking NNI ports; UNI ports are not supported.
• An RRSTP ring must consist of either all VLAN Stacking NNI ports or all standard switch ports; a
mixture of the two port types in the same ring is not supported.
• If an RRSTP ring contains NNI ports, the VLAN tag configured for the ring must match the SVLAN
tag that VLAN Stacking appends to packets before they are received or forwarded on NNI ports.
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