System Monitoring - Cisco Catalyst 4500 series Administration Manual

Understanding Virtual Switching Systems
To avoid multicast route changes as a result of the switchover, we recommend that all links carrying
Note
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:
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•
•
•
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
/recursive
all-filesystems
bootflash:
cat4000_flash:
cns:
crashinfo:
kinfo:
null:
nvram:
revrcsf:
slavebootflash:
slavecat4000_flash:
slavecrashinfo:
slavekinfo:
slavenvram:
slaveslot0:
slaveusb0:
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)SG
5-20
Environmental Monitoring, page 5-20
File System Access, page 5-20
Diagnostics, page 5-21
Network Management, page 5-21
List all files
List files recursively
List files on all filesystems
Directory or file name
Directory or file name
Directory or file name
Directory or file name
Directory or file name
Directory or file name
Directory or file name
Directory or file name
Directory or file name
Directory or file name
Directory or file name
Directory or file name
Directory or file name
Directory or file name
Directory or file name
Chapter 5 Configuring Virtual Switching Systems
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