HP MSR2000 series Configuration Manual page 164

Step
1. Enter system view.
2. Enter interface view.
3. Specify the minimum interval
for sending LSPs and the
maximum LSP number that
can be sent at a time.
4. Specify the LSP retransmission
interval on a P2P link.
Specifying LSP lengths
IS-IS messages cannot be fragmented at the IP layer because they are directly encapsulated in frames.
IS-IS routers in an area must send LSPs smaller than the smallest interface MTU in this area.
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.
To specify LSP lengths:
Step
1. Enter system view.
2. Enter IS-IS view.
3. Specify the maximum length
of generated Level- 1 LSPs or
Level-2 LSPs.
4. 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.
To enable LSP flash flooding:
Step
1. Enter system view.
2. Enter IS-IS view.
3. Enable LSP flash
flooding.
Command
system-view
interface interface-type
interface-number
isis timer lsp time [ count count ]
isis timer retransmit seconds
Command
system-view
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
lsp-length originate size [ level-1 | level-2 ]
lsp-length receive size
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 ] ] *
151
Remarks
N/A
N/A
Optional.
By default, the minimum interval is 33
milliseconds, and the maximum LSP
number that can be sent at a time is 5.
Optional.
5 seconds by default.
Configure a proper LSP retransmission
interval to avoid unnecessary
retransmissions.
Remarks
N/A
N/A
1497 bytes by default.
1497 bytes by default.
Remarks
N/A
N/A
Not enabled by
default.