348 CHAPTER 29: IS-IS CONFIGURATION
Configuring LSP
Parameters
An IS-IS router periodically advertises all the local LSPs to maintain the LSP
synchronization in the entire area.
A LSP is given an aging time when generated by the router. When the LSP is
received by another router, its aging time begins to decrease. If the receiving
router does not get the update for the LSP within the aging time, the LSP will be
deleted from the LSDB.
The router will discard a LSP with incorrect checksum. You can configure the
router to ignore the incorrect checksum, which means a LSP will be processed
even with an incorrect LSP checksum.
On the NBMA network, the router will flood a new LSP received from an interface
to other interfaces. This can cause the LSP reflooding on the high connectivity
networks. To avoid this problem, you can make a mesh group of interfaces. The
interface in this group will only flood the new LSP to interfaces outside the mesh
group.
Follow these steps to configure the LSP parameters:
Enter interface view interface interface-type
interface-number
--
Disable the interface from
sending and receiving hello
packets
isis silent Required
Not disabled by default
To do… Use the command… Remarks
To do… Use the command… Remarks
Enter system view system-view --
Enter IS-IS view isis [ process-id ] --
Specify a LSP refresh interval timer lsp-refresh seconds Optional
900 seconds by default
Specify the maximum LSP
aging time
timer lsp-max-age seconds Optional
1200 seconds by default
Specify LSP generation
interval
timer lsp-generation
maximum-interval
[ initial-interval
[ incremental-interval ]]
[ level-1 | level-2 ]
Optional
2 seconds by default
Enable the LSP flash flooding
function
flash-flood [ flood-count
flooding-count |
max-timer-interval
flooding-interval | [ level-1 |
level-2 ]] *
Optional
Not enabled by default
Specify the maximum size of
the originated Level-1 or
Level-2 LSP
lsp-length originate size
[ level-1 | level-2 ]
Optional
Both are 1497 bytes by
default
Specify the maximum size of
the received Level-1 or Level-2
LSP
lsp-length receive size Optional
Both are 1497 bytes by
default
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