HP VPN Firewall Appliances Network Management Configuration Guide

448
Ste
p
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 [ initial-interval
[ second-wait-interval ] ]
Optional.
The default SPF calculation
interval is 10 seconds.
Configuring convergence priorities for specific routes
A topology change causes IS-IS routing convergence. To achieve faster routing convergence, you can
assign different convergence priorities to specific IS-IS routes.
To assign convergence priorities to specific IS-IS routes:
Ste
p
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 convergence
priorities to specific
IS-IS routes.
priority high { ip-prefix prefix-name
| tag tag-value }
Optional.
By default, no convergence priority is
assigned to specific IS-IS routes.
IS-IS host routes have a convergence
priority lower than the high priority, but
higher than that of the other 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, temporarily isolate the router from
the IS-IS network by setting the overload bit.
To set the LSDB overload bit:
Ste
p
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. Set the overload bit.
set-overload [ on-startup [ [ start-from-nbr system-id
[ timeout1 [ nbr-timeout ] ] ] | timeout2 ] [ allow { external
| interlevel } * ]
By default, the
overload bit is not
set.