HPE FlexNetwork HSR6800 Configuration Manual page 155

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.
To configure LSP sending intervals:
Step
Enter system view.
1.
Enter interface view.
2.
Specify the minimum interval
3.
for sending LSPs and the
maximum LSP number that
can be sent at a time.
Specify the LSP
4.
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, Hewlett Packard Enterprise recommends
configuring the maximum size of generated LSP packets to be smaller than the smallest interface
MTU in this area. Otherwise, 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
Enter system view.
1.
Enter IS-IS view.
2.
Specify the maximum length
3.
of generated Level-1 LSPs
or Level-2 LSPs.
Specify the maximum length
4.
of received LSPs.
Enabling LSP flash flooding
Changed LSPs can trigger SPF recalculation. To advertise the changed LSPs before the router
recalculates routes for faster network convergence, enable LSP flash flooding.
To enable LSP flash flooding:
Step
Enter system view.
1.
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
143
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