Configuring VLAN Stacking Configuring Service-Based VLAN Stacking
OmniSwitch 6800/6850/9000 Network Configuration Guide March 2008 page 6-19
Configuring VLAN Stacking Network Ports
The ethernet-service svlan nni command is used to configure a switch port or link aggregate of ports as a
VLAN Stacking Network Network Interface (NNI) and associate the NNI with an SVLAN. Note that NNI
ports are not associated with IP Multicast VLANs. For example, the following command configures port
2/1 as an NNI port and associates 2/1 with SVLAN 300:
-> ethernet-service svlan 300 nni 2/1
When a port is associated with an SVLAN using this command, the port is automatically defined as an
NNI to carry traffic for the specified SVLAN. In addition, the default VLAN for the port is changed to a
VLAN that is reserved for the VLAN Stacking application. At this point, the port is no longer config-
urable using standard VLAN port commands.
To delete an NNI port association with an SVLAN, use the no form of the ethernet-service svlan nni
command. For example, the following command deletes the association between NNI 2/1 and SVLAN
300:
-> no ethernet-service svlan 300 nni 2/1
Note that when the last SVLAN association for the port is deleted, the port automatically reverts back to a
conventional switch port and is no longer VLAN Stacking capable.
Use the show ethernet-service port command to verify the NNI port configuration for the switch.
Configuring NNI Port Parameters
The ethernet-service nni command is used to configure the following parameters that apply to traffic
processed by NNI ports:
• tpid—Configures the vendor TPID value for the SVLAN tag. This value is set to 0x8100 by default.
and is applied to traffic egressing on the NNI port and is compared to the SVLAN tag of packets
ingressing on the NNI port. If the configured NNI TPID value and the ingress packet value match, then
the packet is considered an SVLAN tagged packet. If these values do not match, then the packet is
classified as a non-SVLAN tagged packet.
• gvrp legacy-bpdu—Specifies whether or not legacy GVRP BPDU are tunneled on the NNI port.
GVRP BPDU are dropped by default.
• stp legacy-bpdu—Specifies whether or not legacy Spanning Tree BPDU are tunneled on the NNI port.
Spanning Tree BPDU are dropped by default.
The following command example configures the vendor TPID for NNI port 2/1 to 0x88a8 and enables
support for Spanning Tree legacy BPDU:
-> ethernet-service nni 2/1 tpid 88a8 stp legacy-bpdu enable
Consider the following when configuring NNI port parameter values:
• A mismatch of TPID values on NNI ports that are connected together is not supported; VLAN Stack-
ing will not work between switches using different NNI TPID values.
• Enable legacy BPDU support only on VLAN Stacking network ports that are connected to legacy
BPDU switches. Enabling legacy BPDU between AOS switches may cause flooding or an unstable
network.
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