Network management, Dual-active detection – Cisco 6500 User Manual
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Cisco IOS Software Configuration Guide, Release 12.2SX
OL-13013-06
Chapter 4 Configuring Virtual Switching Systems
Understanding Virtual Switching Systems
Network Management
The following sections describe network management for a VSS:
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Telnet over SSH Sessions and the Web Browser User Interface, page 4-22
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Telnet over SSH Sessions and the Web Browser User Interface
A VSS supports remote access using Telnet over SSH sessions and the Cisco web browser user interface.
All remote access is directed to the VSS active supervisor engine, which manages the whole VSS.
If the VSS performs a switchover, Telnet over SSH sessions and web browser sessions are disconnected.
SNMP
The SNMP agent runs on the VSS active supervisor engine.
CISCO-VIRTUAL-SWITCH-MIB is a new MIB for virtual switch mode and contains the following
main components:
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cvsGlobalObjects — Domain #, Switch #, Switch Mode
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cvsCoreSwitchConfig — Switch Priority
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cvsChassisTable — Chassis Role and Uptime
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cvsVSLConnectionTable — VSL Port Count, Operational State
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cvsVSLStatsTable — Total Packets, Total Error Packets
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cvsVSLPortStatsTable — TX/RX Good, Bad, Bi-dir and Uni-dir Packets
Command Console
Connect console cables to both supervisor engine console ports. You can only use configuration mode
in the console for the VSS active supervisor engine.
The console on the VSS standby chassis will indicate that chassis is operating in VSS standby mode by
adding the characters “-stdby” to the command line prompt. You cannot enter configuration mode on the
VSS standby chassis console.
The following example shows the prompt on the VSS standby console:
Router-stdby> show switch virtual
Switch mode : Virtual Switch
Virtual switch domain number : 100
Local switch number : 1
Local switch operational role: Virtual Switch Standby
Peer switch number : 2
Peer switch operational role : Virtual Switch Active
Dual-Active Detection
If the VSL fails, the VSS standby chassis cannot determine the state of the VSS active chassis. To ensure
that switchover occurs without delay, the VSS standby chassis assumes the VSS active chassis has failed
and initiates switchover to take over the VSS active role.