3Com MSR 50 Series Configuration Manual page 901

To do...
Enable the LSP flash flooding
function
Specify the maximum size of
the originated Level-1 or
Level-2 LSP
Specify the maximum size of
the received Level-1 or Level-2
LSP
Enable LSP fragment
extension
Create a virtual system
Return to system view
Enter interface view
Add the interface to a mesh
group
n
Note the following when enabling LSP fragment extension
■
■
Configuring SPF When the LSDB changes in an IS-IS network, a routing calculation starts. If the
Parameters 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 (more than 150 thousand). 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:
To do...
Enter system view
Enter IS-IS view
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 created to generate extended LSP
fragments. An IS-IS process allows 50 virtual systems at most.
Tuning and Optimizing IS-IS Network
Use the command...
flash-flood [ flood-count
flooding-count |
max-timer-interval
flooding-interval | [ level-1 |
level-2 ] ] *
lsp-length originate size
[ level-1 | level-2 ]
lsp-length receive size
lsp-fragments-extend
[ level-1 | level-2 | level-1-2 ]
[ mode-1 | mode-2 ]
virtual-system
virtual-system-id
quit
interface interface-type
interface-number
isis mesh-group
[ mesh-group-number |
mesh-blocked ]
Use the command...
system-view
isis [ process-id ]
[ vpn-instance
vpn-instance-name ]
901
Remarks
Optional
Not enabled by default
Optional
Both are 1497 bytes by
default
Optional
Both are 1497 bytes by
default
Optional
Disabled by default
Optional
Not created by default
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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.
Remarks
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