H3C LS-3100-52P-OVS-H3 Operation Manual page 636

3) Specify LSP sending intervals
If a change occurs in the LSDB, IS-IS advertises the changed LSP to neighbors. You can specify the
minimum interval for sending such LSPs.
On a P2P link, IS-IS requires an advertised LSP be acknowledged. If no acknowledgement is received
within a configurable interval, IS-IS will retransmit the LSP.
Follow these steps to configure LSP sending intervals:
To do...
Enter system view
Enter interface view
Specify the minimum interval
for sending LSPs and the
maximum LSP number that can
be sent at a time
Specify the LSP retransmission
interval on a P2P link
Configure a proper LSP retransmission interval to avoid unnecessary retransmissions.
Specifying LSP lengths
IS-IS messages cannot be fragmented at the IP layer because they are directly encapsulated in frames.
Therefore, IS-IS routers in an area need to send LSPs smaller than the smallest interface MTU in this
area.
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
Use the command...
system-view
interface interface-type
interface-number
isis timer lsp time [ count
count ]
isis timer retransmit
seconds
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
1-26
Remarks
––
––
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
Remarks
––
––
1497 bytes by default
1497 bytes by default