Users Guide

View interface configuration for specific VLAN
OS10# show interface vlan 320
Vlan 320 is up, line protocol is up
Address is , Current address is
Interface index is 69209184
Internet address is not set
MTU 1532 bytes
LineSpeed auto
Flowcontrol rx off tx off
ARP type: ARPA, ARP Timeout: 240
Last clearing of "show interface" counters Queueing strategy: fifo Time since last
interface status change:
VLAN Scaling
When VLANs are created, traffic class is specified for each VLAN that maps the VLAN traffic to a specific queue on the egress
port. Class-maps are created for each VLAN matching and the action is specified in the policymap that maps it to a specific
traffic class. Using traffic class-to-queue mapping, the traffic gets mapped to the corresponding queue.
Since ACL rules are created on a per VLAN basis, the scale of VLANs is dependent on the number of ACL rules available. The
ACL space is also shared by other applications such as FCoE. When more VLANs are created, the L2 QoS ACL space for the
VLAN ACLs get exhausted. If the VLAN ACL creation fails, it results in VLAN creation failure. As a result, there cannot be more
than 256 VLANs in Fabric mode.
When a VLAN is created with the uplink ports, a traffic class such as gold, silver, or platinum is assigned to the traffic on the
VLAN. On receiving the configuration from GUI through DNV, the Fabric agent creates a classmap of type qos with the name
CM<vlanid> which matches the same <vlanid>. For example when vlanid 100 with a traffic class of type 4 the classmap created
will be:
classmap type qos CM100
match vlan 100
A single policymap is created to hold all the VLAN classmaps and its applied at the system qos level which gets applied to all the
interfaces.
policymap type qos PM_VLAN
class CM100
set qos-group 4
Any addition, deletion, or modification to the VLAN or the traffic class happens within the same policymap.
In the NPU, each classmap maps to an ACL entry in the L2QOS region matching the vlanid in the classmap.
Constraints
VLAN scaling is limited to the Fabric mode.
Currently Dynamic ARP Inspection (DAI) uses the vlan-group id. NAS implicitly programs the VLAN-group id in the Vlan table.
But DAI feature is not enabled in Fabric mode.
Use of vlan-group id is limited only to applications which require grouping for the purpose of using ACLs.
VLAN commands
description (VLAN)
Adds a description to the selected VLAN.
Syntax
description description
Parameters description — Enter a text string to identify the VLAN. A maximum of 240 characters.
Default Not configured
Command Mode INTERFACE-VLAN
Layer 2 553