3Com Switch 7757, Configuration Manual

Page: 340 / 940

340 C
HAPTER
35: IS-IS C
ONFIGURATION
Configuring the number of Hello packets expected from the remote router
before it is considered dead
In IS-IS, Hello packets are sent and received to maintain router neighbor
relationships. If a router does not receive any Hello packet from a neighboring
router in a certain period of time (Holddown time in IS-IS), the neighbor is
considered dead.
In IS-IS, you can adjust the Holddown time by configuring the number of Hello
packets expected from a neighbor router before it is considered dead.
n
If you do not provide the level-1 keyword or the level-2 keyword, this command
applies to Level-1 and Level-2.
Configuring
Authentication
Configuring authentication on an interface
The authentication configured on the interface applies to the Hello packet in order
to authenticate neighbors. All interfaces must share the same authentication
password in the same level within a network.
Configuring authentication for an IS-IS area or routing domain
You can configure an authentication password for an IS-IS area or routing domain.
If area authentication is required, the area authentication password is
encapsulated in the LSP, CSNP, and PSNP packets at Level-1 as predefined. If area
authentication is also enabled on other routers in the same area, area
authentication works normally only if the authentication mode and password of
these routers are the same as those of the neighboring routers.
Likewise, if domain authentication is required, the domain authentication
password is also encapsulated in the LSP, CSNP, and PSNP packets at Level-2 as
Table 271 Configure the number of Hello packets expected from the remote router
before it is considered dead
Operation Command Description
Enter system view system-view -
Enter interface view interface interface-type
interface-number
Required
Configure the number of
Hello packets expected
from the remote router
before it is considered
dead isis timer holding-multiplier
value [ level-1 | level-2 ]
Optional
By default, three Hello
packets are expected from
the remote router before it is
considered dead.
Table 272 Configure authentication
Operation Command Description
Enter system view system-view -
Enter interface view interface interface-type interface-number Required
Configure the IS-IS
authentication mode and
password isis authentication-mode { simple | md5 }
password [ { level-1 | level-2 } [ ip | osi ] ]
Optional
By default, no
authentication is
configured.