Configuring Overload Flag Bit; Configuring To Ignore The Lsp Checksum Errors - 3Com 3C13636 Configuration Manual

3Com Router 3000 Ethernet Family
Configuration Guide
5.2.15 Configuring Route Aggregation
Route aggregation aggregates multiple routes in the same segment but different
subnets into a single route. The segment does not necessarily mean a natural segment,
but it can also be a subnet segment or supernet segment. All the subnet routes to be
aggregated must have the same next hop.
Route aggregation can effectively minimize route information and routing tables.
Perform the following configuration in IS-IS view.
Table 5-19 Configure route aggregation
Set route aggregation
Delete the route aggregation
By default, the system disables route aggregation.

5.2.16 Configuring Overload Flag Bit

Sometimes, the router in the IS-IS domain may encounter some problems in operation
thus error may occur in the whole routing area. In order to avoid this problem, we 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 this router.
Perform the following configuration in IS-IS view.
Table 5-20 Configure overload flag bit
Set overload flag bit
Remove the overload flag bit
By default, no over load bit is set.

5.2.17 Configuring to Ignore the LSP Checksum Errors

When the local IS-IS receives an LSP packet, it will perform checksum check to it. By
default, if the checksum in the packet is inconsistent with the calculated check sum, the
LSP will be dropped. But if we set to ignore the checking error through the command
ignore-lsp-checksum-error, this packet will be processed as a normal one even if the
LSP checksum errors are found.
Operation
Operation
3Com Corporation
5-16
Chapter 5 Integrated IS-IS Configuration
Command
summary ip-address ip-mask [ level-1 |
level-1-2 | level-2 ]
undo summary ip-address ip-mask
[ level-1 | level-1-2 | level-2 ]
Command
set-overload
undo set-overload