R21xx-HP FlexFabric 11900 Layer 3 IP Routing Configuration Guide
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Setting the LSDB overload bit
By setting the overload bit in sent LSPs, a router informs other routers of failures that make it unable to
select routes and forward packets.
When an IS-IS router cannot record the complete LSDB, for example, because of memory insufficiency,
it will calculate wrong routes. To make troubleshooting easier, temporarily isolate the router from the IS-IS
network by setting the overload bit.
To set the LSDB overload bit:
Ste
p
Command
Remarks
1. Enter system view. system-view N/A
2. Enter IS-IS view.
isis [ process-id ] [ vpn-instance vpn-instance-name ]
N/A
3. Set the overload bit.
set-overload [ on-startup [ [ start-from-nbr system-id
[ timeout1 [ nbr-timeout ] ] ] | timeout2 ] [ allow { external
| interlevel } * ]
By default, the
overload bit is not
set.
Configuring system ID to host name mappings
A 6-byte system ID in hexadecimal notation uniquely identifies a router or host in an IS-IS network. To
make a system ID easy to read, the system allows you to use host names to identify devices and provides
mappings between system IDs and host names.
The mappings can be configured manually or dynamically. Follow these guidelines when you configure
the mappings:
• To view the host name to system ID mapping table, use the display isis name-table command on a
router that is enabled with static or dynamic system ID to host name mapping.
• To view host names rather than system IDs by using the display isis lsdb or display isis peer
command, you must enable dynamic system ID to host name mapping.
• If you configure both dynamic mapping and static mapping on a router, the host name specified for
dynamic mapping applies.
Configuring a static system ID to host name mapping
Ste
p
Command
Remarks
1. Enter system view. system-view N/A
2. Enter IS-IS view.
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
N/A
3. Configure a system ID to host
name mapping for a remote
IS.
is-name map sys-id map-sys-name
A system ID can correspond to only
one host name.