Cisco Catalyst 2960-XR Configuration Guide

Active Interface Backup Interface State
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GigabitEthernet2/0/6 GigabitEthernet2/0/8 Active Up/Backup Standby
Vlans Preferred on Active Interface: 1-50
Vlans Preferred on Backup Interface: 60, 100-120
When a Flex Links interface goes down (LINK_DOWN), VLANs preferred on this interface are moved to
the peer interface of the Flex Links pair. In this example, if interface Gi2/0/6 goes down, Gi2/0/8 carries all
VLANs of the Flex Links pair.
Switch# show interfaces switchport backup
Switch Backup Interface Pairs:
Active Interface Backup Interface State
------------------------------------------------------------------------
GigabitEthernet2/0/6 GigabitEthernet2/0/8 Active Down/Backup Up
Vlans Preferred on Active Interface: 1-50
Vlans Preferred on Backup Interface: 60, 100-120
When a Flex Links interface comes up, VLANs preferred on this interface are blocked on the peer interface
and moved to the forwarding state on the interface that has just come up. In this example, if interface Gi2/0/6
comes up, VLANs preferred on this interface are blocked on the peer interface Gi2/0/8 and forwarded on
Gi2/0/6.
Switch# show interfaces switchport backup
Switch Backup Interface Pairs:
Active Interface Backup Interface State
------------------------------------------------------------------------
GigabitEthernet2/0/6 GigabitEthernet2/0/8 Active Up/Backup Standby
Vlans Preferred on Active Interface: 1-50
Vlans Preferred on Backup Interface: 60, 100-120
Switch# show interfaces switchport backup detail
Switch Backup Interface Pairs:
Active Interface Backup Interface State
------------------------------------------------------------------------
FastEthernet1/0/3 FastEthernet1/0/4 Active Down/Backup Up
Vlans Preferred on Active Interface: 1-2,5-4094
Vlans Preferred on Backup Interface: 3-4
Preemption Mode : off
Bandwidth : 10000 Kbit (Fa1/0/3), 100000 Kbit (Fa1/0/4)
Mac Address Move Update Vlan : auto
Related Topics
Configuring VLAN Load Balancing on Flex Links, on page 157
Flex Links VLAN Load Balancing Configuration Guidelines, on page 153
Restrictions for Configuring Flex Links and MAC Address-Table Move Update, on page 147
Configuring VLAN Load Balancing on Flex Links, on page 157
Catalyst 2960-XR Switch Layer 2 Configuration Guide, Cisco IOS Release 15.0(2)EX1
162 OL-29424-01
Configuring Flex Links and the MAC Address-Table Move Update Feature
Configuring VLAN Load Balancing on Flex Links: Examples

Cisco Catalyst 2960-XR Specifications

General

Stacking Bandwidth	80 Gbps
Layer Support	Layer 2 and Layer 3
Jumbo Frame Support	9198 bytes
RAM	512 MB
Input Voltage	100-240V AC
Model	Catalyst 2960-XR
Uplink Interfaces	4 x 1G SFP or 2 x 10G SFP+
Downlink Interfaces	24 or 48 x Gigabit Ethernet ports
Power Supply	Internal
MAC Address Table Size	16, 000 entries
PoE	Available on PoE models
Weight	4.5 kg
Features	energy efficiency
Stacking	Up to 8 switches
Operating Temperature	0 to 45°C