3Com Switch 8800 Family Configuration Guide

354 CHAPTER 32: INTEGRATED IS-IS CONFIGURATION
Setting Overload Flag
Bit
Sometimes, the router in the IS-IS domain may encounter some problems in
operation thus errors may occur in the whole routing area. In order to avoid this
problem, you can set the overload flag bit for this router.
When the overload threshold is set, other routers should not send this router the
packets which should be forwarded by it.
Perform the following configurations in IS-IS view.
By default, no over load bit is set.
Setting to Discard the
LSPs with Checksum
Errors
After receiving an LSP packet, the local IS-IS will calculate its checksum and
compares the result with the checksum in the LSP packet. This process is the
checksum authentication over the received LSP. By default, even when the
checksum in the packet is not consistent with the calculated result, the LSP packet
is not discarded. However, when not ignoring LSP checksum error is set with the
ignore-lsp-checksum-error command, the LSP packet will be discarded if the
checksum error is found.
Perform the following configuration in IS-IS view.
By default, the LSP checksum error is ignored.
Setting to Log the Peer
Changes
After peer changes log is enabled, the IS-IS peer changes will be output on the
configuration terminal until the log is disabled.
Perform the following configuration in IS-IS view.
By default, the peer changes log is disabled.
Setting LSP Refreshment
Interval
In order to ensure that the LSPs in the whole area can maintain the
synchronization, all the current LSPs will be transmitted periodically.
Perform the following configuration in IS-IS view.
Tabl e 333 Set overload flag bit
Operation Command
Set overload flag bit set-overload
Remove the overload flag bit undo set-overload
Tabl e 334 Set to discard the LSPs with checksum errors
Operation Command
Set to discard the LSP with checksum error ignore-lsp-checksum-error
Set to ignore the LSP checksum error undo ignore-lsp-checksum-error
Tabl e 335 Set to log the peer changes
Operation Command
Enable peer changes log log-peer-change
Disable peer changes log undo log-peer-change