Cisco Catalyst 4948 User Manual

214 Cisco LAN Switching Configuration Handbook
Table 12-4 Switch Commands to Display Power Management Information
Display Function Command
System power
(exec) show power
Module power state
(exec) show power status all
Displaying Information About Power Management
Table 12-4 lists some switch commands that you can use to display helpful information
about power management.
12-5: Environmental Monitoring
A switch command that you can use to display helpful information about environmental
monitoring is as follows:
(exec) show environment temperature
The output from the show environment temperature command lists the temperatures
measured at the intake and exhaust of each module, with the warning and critical alarm
temperatures in parentheses. To operate normally, a switch temperature should not
exceed the levels shown within the parentheses.
“Device 1” and “Device 2” temperatures refer to additional sensors within the modules.
“VTT” modules are located on the chassis backplane.
12-6: Packet Tracing
■ The ping (Packet Internet Groper) command tests end-to-end connectivity from a
switch to a remote host. The IP ping uses ICMP type 8 requests and ICMP type 0
replies.
■ The traceroute or Layer 3 traceroute command discovers the routers along the path
that packets take to a destination. An IP traceroute uses UDP probe packets on port
33434.
■ The l2trace or Layer 2 traceroute command discovers the physical path that a packet
takes through a switched network.
■ l2trace looks up the destination in the forwarding table and then contacts the next
neighboring switch via CDP. Each switch hop is queried in a similar fashion.

Cisco Catalyst 4948 Specifications

General

Switching Capacity	136 Gbps
Forwarding Rate	102 Mpps
Rack Units	1U
MAC Address Table Size	32, 000 entries
Authentication Method	RADIUS, TACACS+
RAM	256 MB
Flash Memory	64 MB
Power Device	Internal power supply
Voltage Required	100-240 VAC
Weight	16.5 lbs
Operating Humidity	10% to 85% non-condensing
Ports	48 x 10/100/1000
Power Supply	Internal
Layer Support	Layer 3
Jumbo Frame Support	Yes (up to 9216 bytes)
Routing Protocol	RIP, OSPF, EIGRP, BGP
Remote Management Protocol	SNMP, Telnet, SSH
Features	VLAN support, QoS
Compliant Standards	IEEE 802.3, IEEE 802.3u, IEEE 802.3ab, IEEE 802.1Q, IEEE 802.1p
Operating Temperature	32 °F to 104 °F (0 °C to 40 °C)