Labels:text | screenshot | diagram | number OCR: DATA-LINK SWITCHING'S ALTERNATE PATH CAPABILITY Router A realizes that the primary pathy Router B receives frames to host C has failed and, using the destined for host C. forwards IP routing protocol OSPF, identifies them and updates its an alternate route through router B. routing table. SNA host A DLSw CSU/DSU PVC 1 CSU/DSU # DLSW router A. router B SNA host A Permanent Virtual Circuit Frame (PVC) 3 fails, relay PVC 2 Host C receives data leaving hosts A cloud traffic roroute Is and C unable to transparent communicate directly: Frame relay Access device {FRAD) SNA node C Figure 3. If PVC 3 fails, router A can send messages to host C via router B. In this network, alternate paths are limited because the frame relay access device doesn't have the intelligence to make routing decisions.
