Cisco 3845 Software Guide - Page 669

Chapter 29 Configuring IP Unicast Routing Configuring Protocol-Independent Features To remove a distance definition, use the no distance router configuration command. Managing Authentication Keys Key management is a method of controlling authentication keys used by routing protocols. Not all protocols can use key management. Authentication keys are available for EIGRP and RIP Version 2. Before you manage authentication keys, you must enable authentication. See the appropriate protocol section to see how to enable authentication for that protocol. To manage authentication keys, define a key chain, identify the keys that belong to the key chain, and specify how long each key is valid. Each key has its own key identifier (specified with the key number key chain configuration command), which is stored locally. The combination of the key identifier and the interface associated with the message uniquely identifies the authentication algorithm and Message Digest 5 (MD5) authentication key in use. You can configure multiple keys with life times. Only one authentication packet is sent, regardless of how many valid keys exist. The software examines the key numbers in order from lowest to highest, and uses the first valid key it encounters. The lifetimes allow for overlap during key changes. Note that the router must know these lifetimes. Beginning in privileged EXEC mode, follow these steps to manage authentication keys: Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Step 7 Step 8 Step 9 Command Purpose configure terminal Enter global configuration mode. key chain name-of-chain Identify a key chain, and enter key chain configuration mode. key number Identify the key number. The range is 0 to 2147483647. key-string text Identify the key string. The string can contain from 1 to 80 uppercase and lowercase alphanumeric characters, but the first character cannot be a number. accept-lifetime start-time {infinite | end-time | duration (Optional) Specify the time period during which the key seconds} can be received. The start-time and end-time syntax can be either hh:mm:ss Month date year or hh:mm:ss date Month year. The default is forever with the default start-time and the earliest acceptable date as January 1, 1993. The default end-time and duration is infinite. send-lifetime start-time {infinite | end-time | duration (Optional) Specify the time period during which the key seconds} can be sent. The start-time and end-time syntax can be either hh:mm:ss Month date year or hh:mm:ss date Month year. The default is forever with the default start-time and the earliest acceptable date as January 1, 1993. The default end-time and duration is infinite. end Return to privileged EXEC mode. show key chain Display authentication key information. copy running-config startup-config (Optional) Save your entries in the configuration file. To remove the key chain, use the no key chain name-of-chain global configuration command. OL-23400-01 Cisco ME 3800X and 3600X Switch Software Configuration Guide 29-103