Cisco Catalyst 4948 User Manual

82 Cisco LAN Switching Configuration Handbook
Core_switch (config-if)# frame-relay interface-dlci 110
Core_switch (config-if)# ip address 192.168.255.5 255.255.255.252
Core_switch (config-if)# no shutdown
Core_switch (config-if)# end
Core_switch # copy running-config startup-config
Core_switch # quit
An example of the Core_switch_2 configuration running IOS follows:
Core_switch_2>enable
Core_switch_2# config t
Core_switch_2(config)# interface serial 7/0/0
Core_switch_2(config-if)# encapsulation frame-relay
Core_switch_2(config)# interface serial 7/0/0.120
Core_switch_2(config-if)# frame-relay interface-dlci 120
Core_switch_2(config-if)# ip address 192.168.255.6 255.255.255.252
Core_switch_2(config-if)# no shutdown
Core_switch_2(config-if)# end
Core_switch_2# copy running-config startup-config
5-5: Layer 3 Virtual Interfaces
■ Virtual interfaces exist for configuration where there is no single physical attachment
to a broadcast domain.
■ For switches with Layer 2 interfaces, VLANs define broadcast domains.
■ The VLAN interface is a Layer 3 interface for any member of the given VLAN.
■ For switches or routers with Layer 3 interfaces, broadcast domains are defined as
bridge groups.
■ To route between bridge groups and other broadcast domains, a bridged virtual
interface (BVI) is used as a Layer 3 interface.
■ In some instances, a physical Layer 3 interface can support traffic from multiple
VLANs.
■ To provide Layer 3 interfaces for each VLAN on the physical connection, a subinter-
face is configured as the Layer 3 interface for the members of the VLAN.
Configuring a VLAN Interface
1. Configure a VLAN switched virtual interface (SVI):
(global) interface vlan number
In global configuration mode, use this command to create and access a VLAN inter-
face. This interface is in the same broadcast domain as the members of the VLAN
number. For this interface to be active, it must first exist in the VLAN database of

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)