Cisco 10000-2P2-2DC Software Guide - Page 324

Multirouter Automatic Protection Switching Chapter 14 Configuring Automatic Protection Switching Figure 14-1 Router A ATM 1/0/0 ATM 1/0/0 Router B Multirouter APS Configuration ATM 2/0/0 Working interface ATM 3/0/0 Protect interface SONET network equipment add/drop multiplexer (ADM) 95570 On the protect circuit, the K1 and K2 bytes from the line overhead (LOH) of the SONET frame indicate the current status of the APS connection and convey any requests for action. This signalling channel is used by the two ends of the connection to maintain synchronization. The working and protect circuits themselves, within the router or routers in which they terminate, are synchronized over an independent communication channel, not involving the working and protect circuits. In Figure 14-1, this independent channel may be a different ATM connection or a lower-bandwidth connection. In a router configured for multirouter APS, the configuration for the protect interface includes the IP address of the router (normally its loopback address) that has the working interface. This chapter describes the MR-APS feature in the following topics: • Feature History for MR-APS, page 14-20 • Restrictions for MR-APS, page 14-21 • Configuration Tasks for MR-APS, page 14-21 • Monitoring and Maintaining the MR-APS Configuration, page 14-27 Feature History for MR-APS Cisco IOS Release 12.0(23)SX 12.0(26)S 12.3(7)XI2 12.2(28)SB Description This feature was introduced on the Cisco 10000 series router. This feature was integrated into Cisco IOS Release 12.0(26)S. This feature was integrated into Cisco IOS Release 12.3(7)XI2. This feature was integrated into Cisco IOS Release 12.2(28)SB. Required PRE PRE1 PRE1 PRE2 PRE2 14-20 Cisco 10000 Series Router Software Configuration Guide OL-2226-23