H3C S5800 Series Configuration Manual page 185

If the IS-IS routers have different interface MTUs, it is recommended to configure the maximum size of
generated LSP packets to be smaller than the smallest interface MTU in this area. Otherwise, the
routers have to dynamically adjust the LSP packet size to fit the smallest interface MTU, which takes
time and affects other services.
Follow these steps to specify LSP lengths:
To do...
Enter system view
Enter IS-IS view
Specify the maximum length of
generated Level-1 LSPs or Level-2
LSPs
Specify the maximum length of
received LSPs
Enabling LSP flash flooding
Since changed LSPs may trigger SPF recalculation, you can enable LSP flash flooding to advertise the
changed LSPs before the router recalculates routes. Doing so can speed up network convergence.
Follow these steps to enable LSP flash flooding:
To do...
Enter system view
Enter IS-IS view
Enable LSP flash flooding
Enabling LSP fragment extension
Follow these steps to enable LSP fragment extension:
To do...
Enter system view
Enter IS-IS view
Enable LSP fragment
extension and specify the
working mode
Use the command...
system-view
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
lsp-length originate size [ level-1 | level-2 ]
lsp-length receive size
Use the command...
system-view
isis [ process-id ] [ vpn-instance vpn-instance-name ]
flash-flood [ flood-count flooding-count |
max-timer-interval flooding-interval | [ level-1 |
level-2 ] ] *
Use the command...
system-view
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
lsp-fragments-extend [ [ level-1 | level-1-2 |
level-2 ] | [ mode-1 | mode-2 ] ] *
5-30
Remarks
––
––
1497 bytes by default
1497 bytes by default
Remarks
––
––
Required
Not enabled by
default
Remarks
––
––
Required
Not enabled by default