flexlink backup

Configures a pair of interfaces (physical or LAG) as Flexlink interfaces which act as an active link and backup link to provide link redundancy.
Syntax
flexlink backup interface { ethernet unit/slot/port | lag lag-id }
no flexlink backup interface { ethernet unit/slot/port | lag lag-id }
Command Default

Flexlink is not enabled by default.

Parameters
interface
Specifies the backup interface.
ethernet unit/slot/port
Specifies an Ethernet interface as the backup link.
lag lag-id
Specifies a LAG interface as the backup link.
Modes

Interface configuration mode

LAG interface configuration mode

Usage Guidelines

The interface under which the flexlink backup command is run is automatically considered as the active link.

The Flexlink interfaces (both the active link and backup link) must be physically up to ensure expected failover forwarding behavior.

A maximum of 32 Flexlink instances can be configured.

Flexlink interfaces must be part of the same VLAN domain. The addition and deletion of Flexlink interfaces on the VLAN must be organized as a port pair.

Spanning support is disabled on flexlink interfaces.

The forwarding state of the Flexlink interfaces are controlled by Flexlink feature, so other Layer 2 features cannot co-exist on those interfaces. Following features cannot be enabled on Flexlink interfaces:

  • Spanning Tree protocol (STP)
  • Per-VLAN protocols (Metro Ring Protocol [MRP] and Virtual Switch Redundancy Protocol [VSRP])
  • Multiple VLAN Registration Protocol (MVRP)
  • Private VLAN (PVLAN)
  • Port MAC security (PMS)
  • Protected ports
  • Flexible Authentication
  • Loop detection

ACL configurations can be applied, but ingress or egress traffic on the backup link will not take effect.

The no form of the command deletes the Flexlink instance.

Examples

The following example configures Ethernet port 1/1/9 as the active link and Ethernet port 1/1/10 as the backup link of a Flexlink instance.

device# configure terminal
device(config)# interface ethernet 1/1/9
device(config-if-e1000-1/1/9)# flexlink backup interface ethernet 1/1/10

The following example configures a pair of LAG interfaces as Flexlink interfaces.

device# configure terminal
device(config)# interface lag 10
device(config-lag-if-lg10)# flexlink backup interface lag 11
History
Release version Command history
09.0.00 This command was introduced.
Parent topic: Commands D through H