Tuning and Optimizing IS-IS Network 351
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The level-1 and level-2 keywords in the isis authentication-mode command
are only supported on a VLAN interface of a switch, and the interface must be
configured with the isis enable command first.
Configuring LSDB
Overload Tag
When the overload tag is set on a router, other routers will not send packets to the
router except for the packets destined to the network directly connected to the
router.
The overload tag can be used for troubleshooting as well. You can temporarily
isolate a router from the IS-IS network by setting the overload tag.
Follow these steps to configure the LSDB overload tag:
Logging the Adjacency
Changes
Follow these steps to configure this task:
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With this feature enabled, the state information of the adjacency is displayed on
the configuration terminal.
Enabling an Interface to
Send Small Hello Packets
Follow these steps to enable an interface to send small hello packets (without the
padding field):
Specify the routing domain
authentication mode
domain-authentication-mo
de { simple | md5 } password
[ ip | osi ]
Required
No authentication is enabled
for Level-2 routing
information, and no password
is specified by default.
Return to system view quit --
Enter interface view interface interface-type
interface-number
--
Specify the authentication
mode and password
isis authentication-mode
{ simple | md5 } password
[ level-1 | level-2 ] [ ip | osi ]
Optional
No authentication and
password are available by
default.
To do… Use the command… Remarks
To do… Use the command… Remarks
Enter system view system-view --
Enter IS-IS view isis [ process-id ] --
Configure the overload
tag
set-overload [ on-startup
[[start-from-nbr system-id
[ timeout1 [ nbr-timeout ]]] |
timeout2 ] [ allow { interlevel |
external } * ]
Required
Not configured by default
To do… Use the command… Remarks
Enter system view system-view --
Enter IS-IS view isis [ process-id ] --
Enable to log the adjacency
changes
log-peer-change Required
Enabled by default
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