154
4. Specify the maximum length
of received LSPs.
lsp-length receive
size
By default, the maximum
length of received LSPs is
1497 bytes.
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:
1. Enter system view.
system-view
N/A
2. Enter IS-IS view.
isis
[ process-id ] [
vpn-instance
vpn-instance-name ]
N/A
3. Enable LSP flash flooding.
flash-flood
[
flood-count
flooding-count
|
max-timer-interval
flooding-interval |
[
level-1 | level-2
] ] *
By default, LSP flash
flooding is disabled.
Enabling LSP fragment extension
Perform this task to enable IS-IS fragment extension for an IS-IS process. The MTUs of all interfaces
running the IS-IS process must not be less than 512. Otherwise, LSP fragment extension does not
take effect.
To enable LSP fragment extension:
1. Enter system view.
N/A
2. Enter IS-IS view.
isis
[ process-id ] [
vpn-instance
vpn-instance-name ]
N/A
3. Enable LSP fragment
extension.
lsp-fragments-extend
[
level-1
|
level-1-2
|
level-2
]
By default, this feature is disabled.
4. Configure a virtual
system ID.
virtual-system
virtual-system-id
By default, no virtual system ID is
configured.
Configure a minimum of one virtual
system to generate extended LSP
fragments.
Limiting LSP flooding
In some networks, many P2P links exist. As shown in Figure 41, Routers A, B, C and D run IS-IS.
When Router A generates an LSP, it floods the LSP out of GigabitEthernet 1/0/1, GigabitEthernet
1/0/2, and GigabitEthernet 1/0/3. After Router D receives the LSP from GigabitEthernet 1/0/3, it
floods it out of GigabitEthernet 1/0/2 and GigabitEthernet 1/0/1 to Router B and Router C. However,
Router B and Router C have already received the LSP from Router A. Repeated LSP flooding
consumes extra bandwidth.
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