R3303-HP HSR6800 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 ar
e 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 ar
e 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.