HP 5500 EI series Configuration Manual page 152

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
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 the 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 the 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
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 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
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 ] ] *
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Remarks
N/A
N/A
By default, the minimum interval is 33
milliseconds, and the maximum LSP
number that can be sent at a time is 5.
By default, the LSP retransmission
interval on a P2P link is 5 seconds.
Remarks
N/A
N/A
By default, the maximum length
of generated Level-1 LSPs or
Level-2 LSPs is 1497 bytes.
By default, the maximum length
of received LSPs is 1497 bytes.
Remarks
N/A
N/A
By default, LSP flash
flooding is disabled.