HP 3600 v2 series Configuration Manual page 167

If the IS-IS routers have different interface MTUs, HP recommends configuring the maximum size of
generated LSP packets to be smaller than the smallest interface MTU in this area. If they are not, the
routers must 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
Changed LSPs may trigger SPF recalculation, so 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
Configure a virtual system ID
NOTE:
After LSP fragment extension is enabled for an IS-IS process, the MTUs of all the interfaces running the
•
IS-IS process must not be less than 512; otherwise, LSP fragment extension will not take effect.
At least one virtual system must be configured for the router to generate extended LSP fragments. An
•
IS-IS process allows 50 virtual systems.
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 ] ] *
virtual-system virtual-system-id
155
Remarks
—
—
1497 bytes by default
1497 bytes by default
Remarks
—
—
Required
Not enabled by
default
Remarks
—
—
Required
Not enabled by default
Required
Not configured by default