Cisco Catalyst 4948 User Manual

6-2: VLAN Port Assignments 91
Configuring Static VLANs 91
Configuring Dynamic VLANs 91
Verifying VLAN Assignments 93
6-3: Trunking 93
Enabling Trunking 93
Specifying VLANs to Trunk 96
Verifying Trunks 97
Feature Example 97
6-4: VLAN Trunking Protocol 98
Enabling VTP for Operation 98
Setting VTP Passwords 99
Changing VTP Modes 100
Enabling VTP Pruning 101
Changing VTP Versions 102
Verifying VTP Operation 102
Feature Example 103
6-5: Private VLANs 104
Configuring Private VLANs 105
Configuring Private Edge VLANs 106
Verifying Private VLAN Operation 107
Feature Example 107
Chapter 7 Spanning Tree Protocol (STP) 111
7-1: STP Operation 111
STP Process 112
STP Tiebreakers 113
Path Costs 113
STP Port States 114
STP Topology Changes 114
Improving STP Stability 115
STP Operation Example 115
7-2: STP Configuration 116
Displaying Information About STP 120
STP Configuration Examples 120
Poor STP Root Placement 120
STP Load Balancing 122
xii Cisco LAN Switching Configuration Handbook

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)