Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 502
Configuring Authentication Passwords, Setting the Overload Bit
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ISIS mode. To view the current IPv6 IS-IS configuration, use the show config command in ROUTER ISIS-ADDRESS FAMILY IPV6 mode. Configuring Authentication Passwords You can assign an authentication password for routers in Level 1 and for routers in Level 2. Because 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. However, if you want the routers in the level to communicate with each other, configure them with the same password. To configure a simple text password, use the following commands. • Configure authentication password for an area. ROUTER ISIS mode area-password [hmac-md5] password Dell supports HMAC-MD5 authentication. This password is inserted in Level 1 LSPs, Complete SNPs, and Partial SNPs. • Set the authentication password for a routing domain. ROUTER ISIS mode domain-password [encryption-type | hmac-md5] password Dell supports both DES and HMAC-MD5 authentication methods. This password is inserted in Level 2 LSPs, Complete SNPs, and Partial SNPs. To view the passwords, use the show config command in ROUTER ISIS mode or the show running-config isis command in EXEC Privilege mode. To remove a password, use either the no area-password or no domain-password commands in ROUTER ISIS mode. Setting 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, the system sets the overload bit and IS-IS traffic continues to transit the system. To set or remove the overload bit manually, use the following commands. • Set the overload bit in LSPs. ROUTER ISIS mode set-overload-bit This setting prevents other routers from using it as an intermediate hop in their shortest path first (SPF) calculations. • Remove the overload bit. ROUTER ISIS mode no set-overload-bit Example of Viewing the Overload Bit Setting When the bit is set, a 1 is placed in the OL column in the show isis database command output. The overload bit is set in both the Level-1 and Level-2 database because the IS type for the router is Level-1-2. Dell#show isis database IS-IS Level-1 Link State Database Intermediate System to Intermediate System 502
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