Cisco Catalyst 4500 Series Software Configuration Guide

5-30
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 5 Configuring Virtual Switching Systems
Configuring a VSS
Dual-Active Detection Restrictions and Guidelines
When configuring dual-active detection, note the following guidelines and restrictions:
• 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 a VSS
These sections describe how to configure a VSS:
• 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
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.
Note 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
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.
Note Switches are reachable to each other through management interfaces. Reachability to neighboring
switches using a management interface isn't supported although the management interface appears in the
candidate VSL list.

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E