Application Scenarios for Keychains
Keychain provides authentication for applications. The following application protocols support Keychain authentication: Routing Information Protocol (RIP), Intermediate System to Intermediate System (IS-IS), Open Shortest Path First (OSPF), Border Gateway Protocol (BGP), Label Distribution Protocol (LDP), Resource Reservation Protocol (RSVP), and Multicast Source Discovery Protocol (MSDP). Applications use the same Keychain authentication procedures. Create a Keychain and then use the Keychain to perform an authentication.
IS-IS Using Keychain for Authentication
IS-IS is a commonly used routing protocol, and IS-IS security is needed. You can configure a fixed authentication algorithm and key to authenticate IS-IS packets. But fixed authentication algorithms and keys may be decrypted. The use of Keychain to authenticate the IS-IS packets makes IS-IS more secure.
As shown in Figure 17-7, SwitchA, SwitchB, SwitchC, SwitchD and SwitchE use IS-IS to communicate. SwitchA, SwitchB, and SwitchC belong to area 10; SwitchD and SwitchE belong to area 20. SwitchA and SwitchB are Level-1 devices; SwitchD and SwitchE are Level-2 devices; SwitchC is a Level-1-2 device. Create a Keychain on each device to authenticate the IS-IS packets. Configure area and domain authentication in the IS-IS process, and configure interface authentication on the interface as well.
