Lenovo Flex System Fabric CN4093, Application Manual

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CN4093 Application Guide for N/OS 8.4
SPAR Processing Modes
SPAR operates in two processing modes. The default mode is pass ‐ through
domain.
 Local Domain: In local ‐ domain processing mode, VLAN classification and
assignment is based on the user ‐ defined VLAN.
 Pass ‐ through Domain: In pass ‐ through domain processing mode, VLAN
classification and assignment is based on the outer tag, which contains the
unique domain VLAN ID of the SPAR. The inner tag with the user ‐ defined
VLAN remains unchanged.
Local Domain Processing
Each SPAR on a switch has a unique VLAN ID, which separates data between
SPARs. If multiple networks share the uplink, the upstream switch port must be
configured as a 802.1Q trunk port so it can process multiple VLAN traffic from a
SPAR. The SPAR domain uses a single uplink port or LAG shared among all the
VLANs. For link redundancy or greater bandwidth, the uplinks can be grouped as
static or LACP LAG.
If a VLAN is defined on multiple SPARs, the egress port mask is used to prevent
communication between the SPARs in the same local domain VLAN. Since port
membership of each SPAR is unique, the egress port mask ensures that different
SPAR ports in the same local domain VLAN do not communicate with each other.
In local domain processing, all SPAR ports must have the following settings:
 Tagging/Trunk mode must be enabled.
 Ingress VLAN tagging is disabled on all SPAR ports.
 PVID/Native VLAN is based on any VLAN defined in SPAR.
CN 4093(config)# interface port
<num>
CN 4093(config-if)# switchport trunk native vlan
<VLAN number>