Cisco Catalyst 4948 User Manual

Chapter 8
Configuring High
Availability Features
See the following sections to configure and use these features:
■ 8-1: Route Processor Redundancy (RPR/RPR+): Supervisor Redundancy:
Discusses the steps needed to configure configuration redundancy and failover for a
Catalyst 6500 with redundant supervisor modules
■ 8-2: Non-Stop Forwarding/Supervisor Switchover (NSF/SSO) with Supervisor
Redundancy: Covers the steps to configure and tune non-stop forwarding and super-
visor switchover on a Catalyst 6500 with redundant supervisor modules
■ 8-3: Router Redundancy with HSRP: Discusses the configuration steps required for
Layer 3 switches to share a common IP address for gateway redundancy
■ 8-4: Fast Software Upgrade (FSU) and Enhanced Fast Software Upgrade (eFSU):
Discusses upgrading the software of supervisors when in redundancy mode
8-1: Route Processor Redundancy (RPR/RPR+)
■ Catalyst 6500 series switches support fault resistance by allowing a redundant
Supervisor engine to take over if the primary Supervisor engine fails.
■ RPR supports a switchover time of two or more minutes.
■ RPR+ decreases the switchover time by initializing the second processor and syn-
chronizing the configurations.
■ When the switch is powered on, RPR runs between the two Supervisor engines. The
Supervisor engine that boots first becomes the RPR active Supervisor engine. The
Multilayer Switch Feature Card and Policy Feature Card become fully operational.
The route processor (RP) and PFC on the redundant Supervisor engine come out of
reset but are not operational.

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)