level (Global IS-IS)
Statement introduced before Junos OS Release 7.4.
Configure the global-level properties.
You can administratively divide a single AS into smaller groups called areas. You configure each routing device interface to be in an area. Any interface can be in any area. The area address applies to the entire routing device. You cannot specify one interface to be in one area and another interface in a different area. To route between areas, you must have two adjacent Level 2 routers that communicate with each other.
Level 1 routers can only route within their IS-IS area. To send traffic outside their area, Level 1 routers must send packets to the nearest intra-area Level 2 router. A routing device can be a Level 1 router, a Level 2 router, or both. You specify the router level on a per-interface basis, and a routing device becomes adjacent to other routing devices on the same level on that link only.
You can configure one Level 1 routing process and one Level 2 routing process on each interface, and you can configure the two levels differently.
If you do not include this statement and the authentication-type statement, IS-IS authentication is disabled.
key—Authentication password. The password can be up to 1024 characters long. Characters can include any ASCII strings. If you include spaces, enclose all characters in quotation marks (“ ”).
A simple password for authentication is truncated if it exceeds 254 characters.
md5—Use HMAC authentication in combination with MD5. HMAC-MD5 authentication is defined in RFC 2104, HMAC: Keyed-Hashing for Message Authentication.
simple—Use a simple password for authentication. The password is included in the transmitted packet, making this method of authentication relatively insecure.
Juniper Networks does not recommend using the simple authentication method, because it is not as secure as MD5.
empty—(Optional) Add POI to a purge received from an IS that does not contain POI information.
self—(Optional) (Optional) Add POI only to self-originated purge LSPs.
To configure IS-IS to generate only the new pair of TLVs and thus to allow the wider range of metric values, include the wide-metrics-only statement.
By default, Junos OS supports the sending and receiving of wide metrics. Junos OS allows a maximum metric value of 63 and generates both pairs of TLVs.
The remaining statements are explained separately. See CLI Explorer.
Required Privilege Level
routing—To view this statement in the configuration.
routing-control—To add this statement to the configuration.