Cisco CISCO876-SEC-I-K9 Configuration Guide - Page 134
Configuring Dial Backup and Remote Management Through the ISDN S/T Port
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Configuring Dial Backup and Remote Management Through the ISDN S/T Port Chapter 13 Configuring Dial Backup and Remote Management Configuring Dial Backup and Remote Management Through the ISDN S/T Port Cisco 876 and Cisco 878 routers can use the ISDN S/T port for remote management. With an advanced enterprise (c870-adventerprisek9-mz) image, a Cisco 876 router can also use the ISDN S/T port for dial backup. Figure 13-2 and Figure 13-3 show two typical network configurations used to provide remote management access and backup for the primary WAN line. In Figure 13-2, the dial backup link goes through a customer premises equipment (CPE) splitter, a digital subscriber line access multiplexer (DSLAM), and a central office (CO) splitter before connecting to the ISDN switch. In Figure 13-3, the dial backup link goes directly from the Cisco router to the ISDN switch. Figure 13-2 Dial Backup Through CPE Splitter, DSLAM, and CO Splitter A 2 3 ATM network 1 B 4 6 5 Internet C 8 7 82892 1 Cisco 876 or Cisco 878 router 2 DSLAM 3 ATM aggregator 4 ISDN switch 5 ISDN 6 ISDN peer router 7 Web server 8 Administrator A Primary DSL interface B Dial backup and remote management through the ISDN interface (ISDN S/T port); serves as a failover link when the primary line goes down C Administrator remote management through the ISDN interface when the primary DSL link is down; serves as dial-in access to allow changes or updates to Cisco IOS configuration -- 13-16 Cisco 850 Series and Cisco 870 Series Access Routers Software Configuration Guide OL-5332-01