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

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Configuring Smart Link
Smart Link is supported only when the SAP module is operating in bridge mode.
Smart Link overview
Background
To avoid single-point failures and guarantee network reliability, downstream devices are usually
dual-homed to upstream devices, as shown in Figure 28.
Figure 28 Diagram for a dual uplink network
To remove network loops on a dual-homed network, you can use a spanning tree protocol or the
Rapid Ring Protection Protocol (RRPP). However, convergence time is long with STP, which makes it
unsuitable for users who have high demand on convergence speed. RRPP can meet demand on
convergence speed, but it involves complicated networking and configurations and is mainly used in
ring-shaped networks.
For more information about STP, see Layer 2—LAN Switching Configuration Guide. For more
information about RRPP, see "Configuring RRPP."
Router A
Router E
Router DRouter C
Router B
Core network
GE
3
/0
/
1
GE
3
/
0
/2
GE
3
/
0
/
1
GE
3
/0
/
1
GE
3
/
0
/
2
GE
3
/0
/
2
GE3/0/3
GE3/0/1
GE3/0/2
GE3/0/3
GE3/0/3
GE3/0/3
GE3/0/1
GE3/0/2
GE3/0/3
User network User network
Master link
Slave link
Smart link group