HPE FlexNetwork 5510 HI Series User Manual

153
Enabling LSP fragment extension
Perform this task to enable IS-IS fragment extension for an IS-IS process. The MTUs of all interfaces
running the IS-IS process must not be less than 512. Otherwise, LSP fragment extension does not
take effect.
To enable LSP fragment extension:
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. Enable LSP fragment
extension.
lsp-fragments-extend
[
level-1
|
level-1-2
|
level-2
]
By default, this feature is disabled.
4. Configure a virtual
system ID.
virtual-system
virtual-system-id
By default, no virtual system ID is
configured.
Configure a minimum of one virtual
system to generate extended LSP
fragments.
Controlling SPF calculation interval
Based on the LSDB, an IS-IS router uses the SPF algorithm to calculate the shortest path tree with
itself being the root, and uses the shortest path tree to determine the next hop to a destination
network. By adjusting the SPF calculation interval, you can prevent bandwidth and router resources
from being over consumed due to frequent topology changes.
When network changes are not frequent, the minimum-interval is adopted. If network changes
become frequent, the SPF calculation interval increases by incremental-interval × 2
n-2
(n is the
number of calculation times) each time a calculation occurs until the maximum-interval is reached.
To control SPF calculation interval:
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. 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.

HPE FlexNetwork 5510 HI Series Specifications

General

Brand	HPE
Model	FlexNetwork 5510 HI Series
Category	Switch
Language	English