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IMPORTANT:
IS-IS NSR and IS-IS GR are mutually exclusive. Do not configure them at the same time.
To configure IS-IS NSR:
Step
1.
Enter system view.
2.
Enter IS-IS view.
3.
Enable IS-IS NSR.
Configuring BFD for IS-IS
BFD provides a single mechanism to quickly detect and monitor the connectivity of links between
IS-IS neighbors, reducing network convergence time. For more information about BFD, see High
Availability Configuration Guide.
To configure BFD for IS-IS:
Step
1.
Enter system view.
2.
Enter interface view.
3.
Enable IS-IS on an interface.
4.
Enable BFD on an IS-IS
interface.
Configuring IS-IS FRR
A link or router failure on a path can cause packet loss and routing loop. IS-IS FRR enables fast
rerouting to minimize the failover time.
Figure 42 Network diagram for IS-IS FRR
Router A
In
Figure
42, after you enable FRR on Router B, IS-IS automatically calculates or designates a
backup next hop when a link failure is detected. In this way, packets are directed to the backup next
Command
system-view
isis [ process-id ]
[ vpn-instance
vpn-instance-name ]
non-stop-routing
Command
system-view
interface interface-type
interface-number
isis enable [ process-id ]
isis bfd enable
Backup nexthop: Router C
Router B
Remarks
N/A
N/A
By default, IS-IS NSR is disabled.
IS-IS NSR takes effect on a
per-process basis. As a best
practice, enable NSR for each IS-IS
process.
Nexthop: Router D
165
Remarks
N/A
N/A
N/A
By default, an IS-IS interface is
not enabled with BFD.
Router E
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