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Use the show running-config isis command in EXEC Privilege mode to view IS-IS configuration globally
(including both IPv4 and IPv6 settings), or the
show config command in ROUTER ISIS mode to view the
current IPv4 IS-IS configuration, or the
show config command in ROUTER ISIS-ADDRESS FAMILY
IPV6 mode to view the current IPv6 IS-IS configuration
Configure authentication passwords
You can assign an authentication password for routers in Level 1 and for routers in Level 2. Since Level 1
and Level 2 routers do not communicate with each other, you can assign different passwords for Level 1
routers and for Level 2 routers. If you want the routers in the level to communicate with each other, though,
they must be configured with the same password.
Use either or both of the commands in ROUTER ISIS mode to configure a simple text password.
Use the
show config command in ROUTER ISIS mode or the show running-config isis command in
EXEC Privilege mode to view the passwords.
Remove a password by using either the
no area-password or no domain-password command in
ROUTER ISIS mode.
Set the overload bit
Another use for the overload bit is to prevent other routers from using this router as an intermediate hop in
their shortest path first (SPF) calculations. For example, if the IS-IS routing database is out of memory and
cannot accept new LSPs, FTOS sets the overload bit and IS-IS traffic continues to transit the system.
Use this command the following command in ROUTER ISIS mode to set the overload bit manually.
Enter
no set-overload-bit to remove the overload bit.
Command Syntax Command Mode Purpose
area-password [hmac-md5]
password
ROUTER ISIS Configure authentication password for an area. FTOS
supports HMAC-MD5 authentication.
This password is inserted in Level 1 LSPs, Complete
SNPs, and Partial SNPs.
domain-password [encryption-type
| hmac-md5] password
ROUTER ISIS Set the authentication password for a routing domain.
FTOS supports both DES and HMAC-MD5
authentication methods. This password is inserted in
Level 2 LSPs, Complete SNPs, and Partial SNPs.
Command Syntax Command Mode Purpose
set-overload-bit ROUTER ISIS Set the overload bit in LSPs. This prevents other routers from
using it as an intermediate hop in their shortest path first (SPF)
calculations.