3Com MSR 50 Series, Руководство по настройке

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900 C
HAPTER
57: IS-IS C
ONFIGURATION
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On a point-to-point link, if there is no response to an LSP sent by the local
router within the specified retransmission interval, the LSP is considered lost,
and the same LSP will be retransmitted. On broadcast links, responses to the
sent LSPs are not required.
■
The interval between hello packets sent by the DIS is 1/3 the hello interval set
by the
isis timer hello command.
Disabling an Interface
from Sending/Receiving
IS-IS Hello Packets
Follow these steps to disable an interface from sending hello packets:
Configuring LSP
Parameters
An IS-IS router periodically advertises all the local LSPs to maintain the LSP
synchronization in the entire area.
An 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 an LSP with incorrect checksum. You can configure the
router to ignore the incorrect checksum, which means an 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:
To do... Use the command... Remarks
Enter system view system-view --
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
Enter system view system-view --
Enter IS-IS view isis [ process-id ]
[ vpn-instance
vpn-instance-name ]
--
Specify an 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