3Com Switch 7700 Configuration Manual page 149

Perform the following configurations in IS-IS view.
Table 73 Setting Overload Flag Bit
Operation
Set overload flag bit
Remove the overload flag bit
By default, no overload bit is set.
Setting to Ignore the LSP Checksum Errors
After receiving an LSP packet, the local IS-IS calculates its checksum and compares
the result with the checksum in the LSP packet. By default, if the checksum in the
packet is found to be inconsistent with the calculated result, the LSP is processed
and rejected. In networks that are prone to corruption, this could result in a packet
corruption storm. However, if the ignore-lsp-checksum-error command is
executed, the LSP will be discarded silently when a checksum error is found .
Perform the following configurations in IS-IS view..
Table 74 Setting to Ignore the LSP Checksum Errors
Operation
Discard the LSPs with checksum errors
Set not to discard the LSP checksum errors
By default, LSP checksum errors are not ignored.
Setting Peer Change Logging
After peer change logging is enabled, IS-IS peer changes will be output on the
configuration terminal until logging is disabled.
Perform the following configuration in IS-IS view..
Table 75 Setting to Log the Peer Changes
Operation
Enable peer changes log
Disable peer changes log
By default, the peer change logging is disabled.
Setting the LSP Refresh Interval
In order to ensure that the LSPs in the whole area can maintain synchronization, all
current LSPs will be transmitted periodically.
Perform the following configurations in IS-IS view.
Table 76 Setting LSP Refresh Interval
Operation
Set LSP refresh interval
Restore the default LSP refresh interval
Command
set-overload
undo set-overload
Command
ignore-lsp-checksum-error
undo ignore-lsp-checksum-error
Command
log-peer-change
undo log-peer-change
Command
timer lsp-refresh seconds
undo timer lsp-refresh
IS-IS 141