Cisco Catalyst 4500 series Administration Manual page 245

Chapter 5 Configuring Virtual Switching Systems
The SMI Director has only one instance on VSS and runs on the VSS active switch. The standby
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Catalyst 4500 switch in a VSS is not listed as a director in the output of the sh vstack status
command.
The VSS configurations in the startup-config file must match on both switches; that is, the domain
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must match, the switch ID must be unique, and the VSL ports' information must match the physical
connection.
There is no restriction to configure oversubscribed linecard ports as VSL. The responsibility of
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bandwidth availability for a given network requirement lies with the network operator.
VSL portchannel must have more than one port in the channel, preferably distributed on more than
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one module. If the VSL consists of only one link, its failure causes a Dual-Active operation of the
VSS. Also, all VSL links configured on one module may cause a Dual-Active operation, if the
module goes down..
• The ICS supervisor engine is supported only in rommon mode; its ports are available but the
supervisor engine neither forwards traffic nor provides any redundancy in that chassis.
• If a dual-supervisor system is being converted to VSS, each supervisor engine in the chassis must
be converted to VSS one at a time; when one supervisor is being converted to VSS, another one must
remain in rommon or be removed from the chassis. When both supervisor engines are converted,
they could be inserted in the chassis. A combination of converted and non-converted supervisor
engines in a chassis is not supported and it may disrupt the network.
Classification and marking based on 'qos-group' in a QoS policy-map is not supported in VSS.
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The following older gneration linecards (WS-X42xy to WS-X45xy) are supported with the VSS
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feature:
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Please remove all other linecards from your system when converting from standalone to VSS mode.
Do not attach a QoS policy with the maximum queue-limit (8184) to a large number of targets in a
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VSS system. This will cause continuous reloads on the standby supervisor engine.
When an aymmetric virtual switch (i.e. a VSS comprising of chassis with different slot capacities)
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boots initially after conversion from standalone mode, the entPhysicalDescr object for the standby
chassis does not hold the correct value. The entPhysicalDescr objects for both the active and standby
chassis will match and hold the value for the active chassis.
After the running configuration is saved and a shelf reload occurs, this behaviour is not observed -
the entPhysicalDescr objects for both chassis accurately reflects the correct chassis types.
OL-30933-01
WS-X4148-RJ
WS-X4148-RJ
WS-X4148-FX-MT
WS-X4306-GB
WS-X4548-RJ45V+
WS-X4448-GB-SFP
WS-X4248-FE-SFP
WS-X4248-RJ45V
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)SG
VSS Configuration Guidelines and Restrictions
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