3Com 3031 Command Reference Manual page 624

624 C 6: R P
HAPTER OUTING
summary
ROTOCOL
value, the calculation of this time ends. If seconds is set to 0, it indicates that
SPF calculation is not divided into slices and it will operate until the end. By
default, the value is 0.
Description
Using the spf-slice-size command, you can configure whether to set slice and the
duration time each time when IS-IS performs SPF route calculation. Using the undo
spf-slice-size command, you can restore the default setting.
When there are a large number of routes in the routing table, this command can
be used to enable the SPF calculation in slices to prevent it from occupying the
system resources for a long time. Each time the router processes some route
information, it will free CPU to process other things, and process route
information after 1 second.
The user is recommended to use the command when the number of routes
reaches 150,000 or 200,000 and the value of seconds is recommended as 1. In
other cases, the default setting should be used, that is, SPF runs to the end with
no slice.
If the spf-delay-interval command is also configured, when SPF calculation is run,
the SPF calculation will be paused if any setting item is met.
For the related command, see spf-delay-interval.
Example
Set the SPF duration time to 1 second.
[3Com-isis] spf-slice-size 1
Syntax
summary ip-address mask [ level-1 | level-1-2 | level-2 ]
undo summary ip-address mask [ level-1 | level-1-2 | level-2 ]
View
IS-IS view
Parameter
ip-address: Address segment of the routes to be aggregated.
mask: Aggregated route mask.
level-1: Aggregates the routes imported into Level-1.
level-1-2: Aggregates the routes imported to both areas and backbone
network.
level-2: Aggregates the routes imported to backbone network only.
Description
Using the summary command, you can configure IS-IS route summary. Using the
undo summary command, you can cancel the summary.
By default, no routes will be summarized.
Similarly, the routes with the same next hops can be aggregated into one route. In
this way, the sizes of the routing table, LSP packets and LSDB are reduced. Among