Dual-Active Detection Restrictions And Guidelines - Cisco Catalyst 4500 Series Software Configuration Manual

Configuring a VSS

Dual-Active Detection Restrictions and Guidelines

When configuring dual-active detection, note the following guidelines and restrictions:
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Configuring a VSS
These sections describe how to configure a VSS:
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Configuring Easy VSS
Beginning with Cisco IOS XE 3.6.0E (IOS 15.2(2)E), the Catalyst 4500 series switch supports Easy
VSS, which enables you to configure VSS with a single command on the active switch and no action on
the VSS standby switch.
The active switch can gather information from all switches that are Layer 3 reachable.
Quad-Supervisor VSS mode is not supported with Easy VSS.
Note
Both switches are directly connected to each other using Layer 3 physical interfaces and are reachable
Note
through these interfaces. These physical interfaces are candidate VSL interfaces and are displayed in a
list of "potential" VSL interfaces in the output of the vsl ? command in easy-vss mode. This output also
displays a list of indirectly-reachable Layer 3 interfaces.
Cisco IOS XE 3.6.0E (IOS 15.2(2)E) only supports reachability using a default route. Management and
user-created VRF are not supported.
Switches are reachable to each other through management interfaces. Reachability to neighboring
Note
switches using a management interface isn't supported although the management interface appears in the
candidate VSL list.
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
5-30
For line redundancy, we recommend configuring at least two ports per switch for dual-active
detection. For module redundancy, the two ports can be on different modules in each switch, and
should be on different modules than the VSL ports, if feasible.
Only trusted PAgP channels are relied upon to detect dual-active mode of operation.
Configuring Easy VSS, page 5-30
Converting to a VSS, page 5-32
Converting to Quad-Supervisor VSS, page 5-37
Displaying VSS Information, page 5-39
Converting a VSS to Standalone Switch, page 5-41
Configuring VSS Parameters, page 5-42
Configuring Multichassis EtherChannels, page 5-48
Configuring Dual-Active Detection, page 5-52
Chapter 5 Configuring Virtual Switching Systems