Alcatel-Lucent 6850-48 Guida Di Rete
Interaction With Other Features
Configuring VLAN Stacking
page 9-8
OmniSwitch AOS Release 6 Network Configuration Guide
September 2009
Link Aggregation
• Both static and dynamic link aggregation are supported with VLAN Stacking.
• Note that 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.
ports.
Quality of Service (QoS)
The QoS application has the following interactions with VLAN Stacking:
• 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
VLAN Stacking packets.
• QoS applies the source vlan and 802.1p policy conditions to the SVLAN (outer) tag of VLAN Stack-
ing 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.
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.
Spanning Tree
• Spanning Tree is enabled by default for VLAN Stacking SVLANs. The Spanning Tree status for an
SVLAN is configurable through VLAN Stacking commands. Note that the SVLAN Spanning Tree
status applies only to the service provider network topology.
status applies only to the service provider network topology.
for information
about configuring VLAN Stacking to tunnel or discard Spanning Tree BPDU.
• See
for information about configuring
VLAN Stacking interoperability with legacy Spanning Tree BPDU systems.
• A back door link configuration is not supported. This occurs when there is a link between two customer
sites that are both connected to a VLAN Stacking provider edge switch.
• A dual home configuration is not supported. This type of configuration consists of a single customer
site connected to two different VLAN Stacking switches or two switches at a customer site connect to
two different VLAN Stacking switches.
two different VLAN Stacking switches.