153
Step Command
Remarks
3.
Assign a high priority to IS-IS
routes.
priority high
{
ip-prefix
prefix-name
|
tag
tag-value
}
Optional.
Not assigned by default.
If no IS-IS route is assigned a high
priority, IS-IS host routes are
processed first in network
convergence because they have
higher priority than other types of
IS-IS routes.
Setting the LSDB overload bit
By setting the overload bit in sent LSPs, a router informs other routers of a failure that makes it incapable
of routing and forwarding packets.
When an IS-IS router cannot record the complete LSDB due to running out of memory or some other
reasons, it will calculate wrong routes. To make troubleshooting easier, you can temporarily isolate the
router from the IS-IS network by setting the overload bit.
To set the LSDB overload bit:
Step 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
} * ]
Not set by default.
Configuring system ID to host name mappings
In IS-IS, a system ID identifies a router or host uniquely. A system ID has a fixed length of 6 bytes. When
an administrator needs to view IS-IS neighbor information, routing table or LSDB information, using the
system IDs in dotted decimal notation is not convenient. To solve it, you can configure the mappings
between system IDs and host names, as host names are easier to remember and use.
Such mappings can be configured manually or dynamically. Note the following:
•
Using the
display isis lsdb
command on a router configured with dynamic system ID to host name
mapping displays router names rather than system IDs.
•
If you configure both dynamic and static system ID to host name mappings on a router, the host
name for dynamic system ID to host name mapping applies.
Configuring a static system ID to host name mapping
Step 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
