Configuring Spf Parameters; Assigning A High Priority To Is-Is Routes; Setting The Lsdb Overload Bit - HP 3600 v2 series Configuration Manual

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.
Follow these steps to configure the SPF parameters:
To do...
Enter system view
Enter IS-IS view
Configure the SPF calculation
interval

Assigning a high priority to IS-IS routes

An IS-IS topology change causes network convergence. By assigning a high priority to specific IS-IS
routes, you can achieve faster network convergence.
Follow these steps to assign a high priority to IS-IS routes:
To do...
Enter system view
Enter IS-IS view
Assign a high priority to IS-IS routes

Setting the LSDB overload bit

By setting the overload bit in sent LSPs, a router informs other routers of a failure that makes it incapable
of routing and forwarding packets.
When an IS-IS router cannot record the complete LSDB due to running out of memory or some other
reasons, it will calculate wrong routes. To make troubleshooting easier, you can temporarily isolate the
router from the IS-IS network by setting the overload bit.
Follow these steps to set the LSDB overload bit:
To do...
Enter system view
Enter IS-IS view
Use the command...
system-view
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
timer spf maximum-interval [ initial-interval
[ second-wait-interval ] ]
Use the command...
system-view
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
priority high { ip-prefix
prefix-name | tag tag-value }
Use the command...
system-view
isis [ process-id ] [ vpn-instance vpn-instance-name ]
156
Remarks
—
—
Optional
The default SPF calculation
interval is 10 seconds.
Remarks
—
—
Optional
Not assigned by default
If no IS-IS route is assigned a high
priority, IS-IS host routes are
processed first in network
convergence because they have
higher priority than other types of
IS-IS routes.
Remarks
—
—