H3C Technologies H3C S5560 Series Switches - Manual (Page 430)

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Step Command Remarks
12. Specify the maximum
number of ECMP routes for
load balancing. ipv6 maximum load-balancing number
By default, the maximum
number of IPv6 IS-IS ECMP
routes equals the maximum
number of ECMP routes
supported by the system.
Use the max-ecmp-num
command to configure the
maximum number of ECMP
routes supported by the
system. For more
information about the
max-ecmp-num command,
see Layer 3—IP Routing
Command Reference.
Tuning and optimizing IPv6 IS-IS networks
Configuration prerequisites
Before you tune and optimize IPv6 IS-IS networks, complete basic IPv6 IS-IS tasks.
Assigning a convergence priority to IPv6 IS-IS routes
A topology change causes IS-IS routing convergence. To improve convergence speed, you can assign
convergence priorities to IPv6 IS-IS routes. Convergence priority levels are critical, high, medium, and low.
The higher the convergence priority, the faster the convergence speed.
By default, IPv6 IS-IS host routes have medium convergence priority, and other IPv6 IS-IS routes have low
convergence priority.
To assign a convergence priority to specific IPv6 IS-IS routes:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter IS-IS view.
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
N/A
3. Assign a convergence priority
to specific IPv6 IS-IS routes.
ipv6 priority { critical | high |
medium } { prefix-list
prefix-list-name | tag tag-value }
By default, IPv6 IS-IS routes, except
IPv6 IS-IS host routes, have the low
convergence priority.
Configuring BFD for IPv6 IS-IS
Bidirectional forwarding detection (BFD) can quickly detect faults between IPv6 IS-IS neighbors to
improve the convergence speed of IPv6 IS-IS. For more information about BFD, see High Availability
Configuration Guide.
To configure BFD for IPv6 IS-IS: