R3102-R3103-HP 6600/HSR6600 Routers High Availability Configuration Guide

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Smart Link collaboration mechanisms
When faults such as unidirectional links, misconnected fibers, or packet loss occur on intermediate
devices or network paths, Smart Link does not sense this on its own. Also, it cannot sense when faults
are cleared. To check the link status, Smart Link ports must use link detection protocols. When a fault
is detected or cleared, the link detection protocols inform Smart Link to switch over the links.
With the collaboration between Smart Link and the Continuity Check (CC) function of Connectivity
Fault Detection (CFD) configured, CFD notifies the ports of fault detection events on the basis of
detection VLANs and detection ports. A port responds to a continuity check event only when the
control VLAN of the smart link group to which it belongs matches the detection VLAN.
For more information about the CC function of CFD, see "Configuring CFD."
Smart Link configuration task list
A Smart Link device is a device that supports Smart Link and is configured with a smart link group and
a transmit control VLAN for flush message transmission. Router C and Router D in Figure 28 are two
examples of Smart Link devices.
An associated device is a device that supports Smart Link, and receives flush messages sent from the
specified control VLAN. Router A, Router B, and Router E in Figure 28 are examples of associated
devices.
Complete the following tasks to configure Smart Link:
Task
Remarks
Configuring a Smart
Link device
Configuring protected VLANs for a smart link group
Required
Configuring member ports for a smart link group
Required
Configuring role preemption for a smart link group
Optional
Enabling the sending of flush messages
Optional
Configuring the collaboration between Smart Link and CC of
CFD
Optional
Configuring an
associated device
Enabling the receiving of flush messages
Required
Configuring a Smart Link device
Configuration prerequisites
Before configuring a Smart Link device, complete the following tasks:
 Shut down a port to prevent loops before configuring a port as a smart link group member. You
can bring up the port only after completing the smart link group configuration.
 Disable the spanning tree feature and RRPP on the ports you want to add to the smart link group,
and make sure that the ports are not member ports of any aggregation group or service
loopback group.