HP FlexFabric 12900E Series Configuration Manual page 162

occurs frequently, excessive LSPs are generated, consuming a large amount of router
resources and bandwidth. To solve the problem, you can adjust the LSP generation interval.
When network changes are not frequent, the minimum-interval is adopted. If network changes
become frequent, the LSP generation interval is incremented by incremental-interval × 2n-2 (n
is the number of calculation times) each time a generation occurs until the maximum-interval is
reached.
To specify the LSP refresh interval and generation interval:
Step
1. Enter system view.
2. Enter IS-IS view.
3. Specify the LSP refresh
interval.
4. Specify
generation interval.
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 these LSPs to control the amount of LSPs on the
network.
On a P2P link, IS-IS requires an advertised LSP be acknowledged. If no acknowledgment is
received within a configurable interval, IS-IS will retransmit the LSP.
To configure LSP sending intervals:
Step
1. Enter system view.
2. Enter interface view.
3. Specify
interval for sending LSPs
and the maximum LSP
number that can be sent at
a time.
4. Specify
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 the area.
If the IS-IS routers have different interface MTUs, configure the maximum size of generated LSP
packets to be smaller than the smallest interface MTU in the area. Without the configuration, the
routers must dynamically adjust the LSP packet size to fit the smallest interface MTU, which takes
time and affects other services.
Command
system-view
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
timer lsp-refresh seconds
timer lsp-generation maximum-interval
the LSP
[
[ incremental-interval ] ] [ level-1 |
level-2 ]
Command
system-view
interface
interface-number
the minimum
isis timer lsp time [ count
count ]
the LSP
isis
seconds
minimum-interval
Remarks
N/A
interface-type
N/A
By default, the minimum interval is
33 milliseconds, and the maximum
LSP number that can be sent at a
time is 5.
timer retransmit By default, the LSP retransmission
interval on a P2P link is 5 seconds.
150
Remarks
N/A
N/A
By default, the LSP refresh
interval is 900 seconds.
By default:
•
The maximum interval
is 5 seconds.
•
The minimum interval
is 50 milliseconds.
•
The incremental
interval is 200
milliseconds.