156
Step
Command
Remarks
3.
Configure the SPF
calculation interval.
timer spf maximum-interval
[
minimum-interval
[
incremental-interval
] ]
By default:
•
The maximum interval is
5 seconds.
•
The minimum interval is
50 milliseconds.
•
The incremental interval
is 200 milliseconds.
Configuring convergence priorities for specific routes
A topology change causes IS-IS routing convergence. To improve convergence speed, you can
assign convergence priorities to IS-IS routes. Convergence priority levels are critical, high, medium,
and low. The higher the convergence priority, the faster the convergence speed.
By default, IS-IS host routes have medium convergence priority, and other IS-IS routes have low
convergence priority.
To assign convergence priorities to specific IS-IS routes:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter IS-IS IPv4 unicast
address family view.
a
isis
[
process-id
] [
vpn-instance
vpn-instance-name
]
b
cost-style
{
wide
|
wide-compatible
}
c
address-family ipv4
[
unicast
]
N/A
3.
Assign convergence
priorities to specific IS-IS
routes.
•
Method 1:
prefix-priority
{
critical
|
high
|
medium
} {
prefix-list prefix-list-name
|
tag
tag-value
}
•
Method 2
:
prefix-priority route-policy
route-policy-name
By default, IS-IS
routes, except IS-IS
host routes, have the
low convergence
priority.
Setting the LSDB overload bit
By setting the overload bit in sent LSPs, a router informs other routers of failures that make it unable
to select routes and forward packets.
When an IS-IS router cannot record the complete LSDB, for example, because of memory
insufficiency, it will calculate wrong routes. To make troubleshooting easier, temporarily isolate the
router from the IS-IS network by setting the overload bit.
To set the LSDB overload bit:
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
Summary of Contents for HPE FlexNetwork 7500 series
Page 505: ...493 Connector N A ...
