5-20
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)SG
OL-30933-01
Chapter 5 Configuring Virtual Switching Systems
Understanding Virtual Switching Systems
Note To avoid multicast route changes as a result of the switchover, we recommend that all links carrying
multicast traffic be configured as MEC rather than Equal Cost Multipath (ECMP).
For packets traversing VSL, all Layer 3 multicast replication occurs on the egress switch. If there are
multiple receivers on the egress switch, only one packet is replicated and forwarded over the VSL, and
then replicated to all local egress ports.
Software Features
Software features run only on the VSS Active supervisor engine. Incoming packets to the VSS Standby
switch that require software processing are sent across the VSL to the VSS Active supervisor engine.
System Monitoring
The following sections describe system monitoring and system management for a VSS:
• Environmental Monitoring, page 5-20
• File System Access, page 5-20
• Diagnostics, page 5-21
• Network Management, page 5-21
Environmental Monitoring
Environmental monitoring runs on both supervisor engines. The VSS Standby switch reports
notifications to the VSS Active supervisor engine. The VSS Active switch gathers log messages for both
switches. The VSS Active switch synchronizes the calendar and system clock to the VSS Standby
switch.
File System Access
File system access on VSS is the same as it is on dual supervisor standalone system. All files on a
standby switch are accessible with slave prefix as following:
Switch# dir ?
/all List all files
/recursive List files recursively
all-filesystems List files on all filesystems
bootflash: Directory or file name
cat4000_flash: Directory or file name
cns: Directory or file name
crashinfo: Directory or file name
kinfo: Directory or file name
null: Directory or file name
nvram: Directory or file name
revrcsf: Directory or file name
slavebootflash: Directory or file name
slavecat4000_flash: Directory or file name
slavecrashinfo: Directory or file name
slavekinfo: Directory or file name
slavenvram: Directory or file name
slaveslot0: Directory or file name
slaveusb0: Directory or file name
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