H3C Technologies H3C S12500-X Series Switches - Manual (Page 155)

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.