3Com Switch 8800 Configuration Guide
Chapter 20 Integrated IS-IS Configuration
20-20
Table 20-24
Set the mesh group of the interface
Operation
Command
Add an interface to a mesh group
isis mesh-group
{
mesh
-
group
-
number
|
mesh-blocked
}
Remove the interface from the mesh
group
undo isis mesh-group
By default, the LSP is flooded normally from the interface. When configured with the
mesh-blocked
keyword, it will not flood the LSP to other interfaces.
Thus the IS-IS configuration tasks on the interface are finished. The following sections
discuss how to configure other parameters of IS-IS.
20.2.18 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.
Table 20-25
Set overload flag bit
Operation
Command
Set overload flag bit
set-overload
Remove the overload flag bit
undo set-overload
By default, no over load bit is set.
20.2.19 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.
