Smart Link Collaboration Mechanisms; Smart Link Configuration Task List - HPE 3100 v2 Series Configuration Manual

NOTE:
When a port switches to the forwarding state, the system outputs log information to notify the user of
the port state change.
Topology change mechanism
Because link switchover can outdate the MAC address forwarding entries and ARP/ND entries on all
devices, you need a forwarding entry update mechanism to ensure proper transmission. By far, the
following two update mechanisms are provided:
•
Uplink traffic-triggered MAC address learning, where update is triggered by uplink traffic. This
mechanism is applicable to environments with devices not supporting Smart Link, including
devices of other vendors'.
•
Flush update where a Smart Link-enabled device updates its information by transmitting flush
messages over the backup link to its upstream devices. This mechanism requires the upstream
devices to be capable of recognizing Smart Link flush messages to update its MAC address
forwarding entries and ARP/ND entries.
Role preemption mechanism
As shown in
Device C is the slave link. Once the master link fails, Port1 is automatically blocked and placed in
standby state, and Port2 takes over to forward traffic. When the master link recovers, one of the
following occurs:
•
If the smart link group is not configured with role preemption, to keep traffic forwarding stable,
Port1 that has been blocked due to link failure does not immediately take over to forward traffic.
Rather, it stays blocked until the next link switchover.
•
If the smart link group is configured with role preemption, Port1 takes over to forward traffic as
soon as its link recovers, and Port2 is automatically blocked and placed in standby state.
Load sharing mechanism
A ring network may carry traffic of multiple VLANs. Smart Link can forward traffic of different VLANs
in different smart link groups, implementing load sharing.
To implement load sharing, you can assign a port to multiple smart link groups (each configured with
different protected VLANs), making sure that the state of the port is different in these smart link
groups. In this way, traffic of different VLANs can be forwarded along different paths.
You can configure protected VLANs for a smart link group by referencing Multiple Spanning Tree
Instances (MSTIs).

Smart Link collaboration mechanisms

Smart Link cannot sense by itself when faults occur on the uplink of the upstream devices, or when
faults are cleared. To monitor the uplink status of the upstream devices, you can configure the
Monitor Link function to monitor the uplink ports of the upstream devices. Monitor Link adapts the
up/down state of downlink ports to the up/down state of uplink ports, triggering Smart Link to perform
link switchover on the downstream device.
For more information about Monitor Link, see

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. Device C and Device D in
examples of smart link devices.
Figure 22, the link on Port1 of Device C is the master link, and the link on Port2 of
"Configuring Monitor
95
Link"
Figure 22 are two