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H3C Technologies H3C S12500-X Series Switches User Manual

Page 155

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141

Step

Command

Remarks

4.

Specify the LSP
generation interval.

timer lsp-generation maximum-interval
[ minimum-interval
[ incremental-interval ] ] [ level-1 |

level-2 ]

By default:

The maximum interval is

5 seconds.

The minimum interval is

20 milliseconds.

The incremental interval

is 200 milliseconds.

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 acknowledgement is
received within a configurable interval, IS-IS will retransmit the LSP.
To configure LSP sending intervals:

Step

Command

Remarks

1.

Enter system view.

system-view

N/A

2.

Enter interface view.

interface interface-type
interface-number

N/A

3.

Specify the minimum
interval for sending LSPs

and the maximum LSP

number that can be sent at a
time.

isis timer lsp time [ count
count ]

By default, the minimum interval is
33 milliseconds, and the maximum

LSP number that can be sent at a
time is 5.

4.

Specify the LSP

retransmission interval on a
P2P link.

isis timer retransmit seconds

By default, the LSP retransmission
interval on a P2P link is 5 seconds.

552B

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, H3C 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 Command

Remarks

1.

Enter system view.

system-view

N/A

2.

Enter IS-IS view.

isis [ process-id ] [ vpn-instance
vpn-instance-name ]

N/A

3.

Specify the maximum length
of generated Level-1 LSPs or

Level-2 LSPs.

lsp-length originate size [ level-1 |
level-2 ]

By default, the maximum length
of generated Level-1 LSPs or
Level-2 LSPs is 1497 bytes.

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