Tuning and Optimizing IS-IS Network 349
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Note the following when enabling LSP fragment extension
■ After LSP fragment extension is enabled in an IS-IS process, the MTUs of all the
interfaces with this IS-IS process enabled must not be less than 512; otherwise,
LSP fragment extension will not take effect.
■ At least one virtual system needs to be configured for the router to generate
extended LSP fragments.
Configuring SPF
Parameters
When the LSDB changes in an IS-IS network, a routing calculation starts. If the
changes happen frequently, it will take a lot of system resources. You can set the
interval for SPF calculation for efficiency consideration.
The SPF calculation may occupy the CPU for a long time when the routing entries
are too many. You can split the SPF calculation time into multiple durations with a
default interval of 10s in between.
Follow these steps to configure the SPF parameters:
Configuring Dynamic
Host Name Mapping
Follow these steps to configure the dynamic host name mapping:
Enable LSP fragment
extension
lsp-fragments-extend
[ level-1 | level-2 | level-1-2 ]
[ mode-1 | mode-2 ]
Optional
Disabled by default
Create a virtual system virtual-system
virtual-system-id
Optional
Not created by default
Return to system view quit --
Enter interface view interface interface-type
interface-number
--
Add the interface to a mesh
group
isis mesh-group
[ mesh-group-number |
mesh-blocked ]
Optional
Not added by default
If the mesh-blocked keyword
is included, the interface is
blocked from flooding LSPs. It
can send an LSP only after
receiving a request.
To do… Use the command… Remarks
To do… Use the command… Remarks
Enter system view system-view --
Enter IS-IS view isis [ process-id ] --
Configure the SPF calculation
intervals
timer spf maximum-interval
[ minimum-interval
[ incremental-interval ]]
Optional
The default SPF calculation
interval is 10 seconds.
Specify the SPF calculation
duration
spf-slice-size duration-time Optional
10 milliseconds by default
To do… Use the command… Remarks
Enter system view system-view --
Enter IS-IS view isis [ process-id ] --
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