Cisco Catalyst 3750 User Manual

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Catalyst 3750 Switch Command Reference
OL-8552-07
Chapter 2 Catalyst 3750 Switch Cisco IOS Commands
switchport backup interface
This example shows how to configure the Fast Ethernet interface as the MMU primary VLAN:
Switch# configure terminal
Switch(conf)# interface fastethernet1/0/1
Switch(conf-if)# switchport backup interface fastethernet1/0/2 mmu primary vlan 1021
Switch(conf-if)# end
You can verify your setting by entering the show interfaces switchport backup privileged EXEC
command.
The following example shows how to configure preferred VLANs:
Switch(config)# interface gigabitethernet 1/0/6
Switch(config-if)# switchport backup interface gigabitethernet 1/0/8 prefer vlan
60,100-120
You can verify your setting by entering the show interfaces switchport backup privileged EXEC
command.
In the following example, VLANs 60, and 100 to 120 are configured on the switch:
Switch(config)# interface gigabitEthernet 1/0/6
Switch(config-if)# switchport backup interface gigabitEthernet 1/0/8 prefer vlan
60,100-120
When both interfaces are up, Gi1/0/6 forwards traffic for VLANs 1 to 50, and Gi1/0/8 forwards traffic
for VLANs 60 and 100 to 120.
Switch# show interfaces switchport backup
Switch Backup Interface Pairs:
Active Interface Backup Interface State
------------------------------------------------------------------------
GigabitEthernet1/0/6 GigabitEthernet1/0/8 Active Up/Backup Up
Vlans Preferred on Active Interface: 1-50
Vlans Preferred on Backup Interface: 60, 100-120
When a Flex Link interface goes down (LINK_DOWN), VLANs preferred on this interface are moved
to the peer interface of the Flex Link pair. In this example, if interface Gi1/0/6 goes down, Gi1/0/8 carries
all VLANs of the Flex Link pair.
Switch# show interfaces switchport backup
Switch Backup Interface Pairs:
Active Interface Backup Interface State
------------------------------------------------------------------------
GigabitEthernet1/0/6 GigabitEthernet1/0/8 Active Down/Backup Up
Vlans Preferred on Active Interface: 1-50
Vlans Preferred on Backup Interface: 60, 100-120

Cisco Catalyst 3750 Specifications

General

Device Type	Switch
Switching Capacity	32 Gbps
Forwarding Rate	38.7 Mpps
Stacking Bandwidth	32 Gbps
RAM	128 MB
Jumbo Frame Support	Yes
Switch Type	Managed
Model	Catalyst 3750 Series
Uplink Interfaces	SFP
Form Factor	Rack-mountable
MAC Address Table Size	12, 000 entries
Routing Protocol	RIP, OSPF, EIGRP
Remote Management Protocol	SNMP, Telnet, HTTP
Features	Layer 3 switching, Layer 2 switching, auto-negotiation, BOOTP support, ARP support, VLAN support, auto-uplink (auto MDI/MDI-X), IGMP snooping, traffic shaping, MAC address filtering, Quality of Service (QoS), Jumbo Frames support, MLD snooping, Dynamic ARP Inspection (DAI), Cisco EnergyWise technology
Power over Ethernet (PoE)	PoE
Operating Temperature	-5 - 45 °C
Operating Humidity	10% to 85% non-condensing