Switchport Backup Interface - Cisco catalyst 3750 Command Reference Manual
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- Software configuration manual (926 pages) ,
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switchport backup interface
switchport backup interface
Use the switchport backup interface interface configuration command on a Layer 2 interface to
configure Flex Links, a pair of interfaces that provide backup to each other. Use the no form of this
command to remove the Flex Links configuration.
Syntax Description
FastEthernet
GigabitEthernet
Port-channel
TenGigabitEthernet
interface-id
mmu
primary vlan vlan-id
multicast
fast-convergence
preemption
delay delay-time
mode
prefer vlan vlan-id
off
delay delay-time
Defaults
The default is to have no Flex Links defined. Preemption mode is off. No preemption occurs. Preemption
delay is set to 35 seconds.
Command Modes
Interface configuration
Catalyst 3750 Switch Command Reference
2-832
switchport backup interface [FastEthernet interface-id | GigabitEthernet interface-id |
Port-channel interface-id | TenGigabitEthernet interface-id ] {mmu primary vlan
interface-id | multicast fast-convergence | preemption {delay delay-time | mode} | prefer
vlan vlan-id}
no switchport backup interface [FastEthernet interface-id | GigabitEthernet interface-id |
Port-channel interface-id | TenGigabitEthernet interface-id ] {mmu primary vlan
interface-id | multicast fast-convergence | preemption {delay delay-time | mode} | prefer
vlan vlan-id}
FastEthernet IEEE 802.3 port name. Valid range is 0 to 9.
GigabitEthernet IEEE 802.3z port name. Valid range is 0 to 9.
Ethernet Channel of interface. Valid range is 0 to 48.
Ten Gigabit Ethernet port name. Valid range is 0 to 9.
Specify that the Layer 2 interface to act as a backup link to the interface
being configured. The interface can be a physical interface or port channel.
The port-channel range is 1 to 48.
MAC-address move update. Configure the MAC move update (MMU) for a
backup interface pair.
The VLAN ID of the private-VLAN primary VLAN; valid range is 1 to
4,094.
Multicast Fast-convergence parameter.
Configure a preemption scheme for a backup interface pair.
(Optional) Specify a preemption delay; the valid values are 1 to 300 seconds.
Specify a preemption mode as bandwidth, forced, or off.
Specify that VLANs are carried on the backup interfaces of a Flex Link pair.
VLAN ID range is 1 to 4,094.
(Optional) Specify that no preemption occurs from backup to active.
(Optional) Specify a preemption delay; the valid values are 1 to 300 seconds.
Chapter 2 Catalyst 3750 Switch Cisco IOS Commands
OL-8552-07
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