Configuring Spf Parameters - HPE 5800 Series Configuration Manual

Enabling LSP flash flooding
Changed LSPs can trigger SPF recalculation. To advertise the changed LSPs before the router
recalculates routes for faster network convergence, enable LSP flash flooding.
To enable LSP flash flooding:
Step
Enter system view.
1.
Enter IS-IS view.
2.
Enable LSP flash
3.
flooding.
Enabling LSP fragment extension
After LSP fragment extension is enabled for an IS-IS process, the MTUs of all the interfaces running
the IS-IS process must not be less than 512. Otherwise, LSP fragment extension will not take effect.
At least one virtual system must be configured for the router to generate extended LSP fragments.
An IS-IS process allows a maximum of 50 virtual systems.
To enable LSP fragment extension:
Step
Enter system view.
1.
Enter IS-IS view.
2.
Enable LSP fragment
3.
extension and specify
the working mode.
Configure a virtual
4.
system ID.

Configuring SPF parameters

When the LSDB changes on a router, a route calculation starts. Frequent route calculations
consume a lot of system resources. You can set an appropriate interval for SPF calculations to
improve efficiency.
To configure the SPF parameters:
Step
Enter system view.
1.
Enter IS-IS view.
2.
Configure the SPF
3.
calculation interval.
Command
system-view
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
flash-flood [ flood-count flooding-count |
max-timer-interval flooding-interval | [ level-1 |
level-2 ] ] *
Command
system-view
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
lsp-fragments-extend [ [ level-1 | level-1-2
| level-2 ] | [ mode-1 | mode-2 ] ] *
virtual-system virtual-system-id
Command
system-view
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
timer spf maximum-interval [ initial-interval
[ second-wait-interval ] ]
136
Remarks
N/A
N/A
Not enabled by
default.
Remarks
N/A
N/A
Not enabled by default.
Not configured by default.
Remarks
N/A
N/A
Optional.
The default SPF
calculation interval is 10
seconds.