3Com Router 3000 Ethernet FamilyConfiguration Guide Chapter 3 Auto Detect Configuration3Com Corporation3-93.5.2 Using Auto Detect with Interface BackupI. Network requirementsz Configure dynamic routing on Routers A, B, C, and D, ensuring the routesbetween Routers A, B, and C are reachable, and the routes between Routers A, D,and C are reachable.z Create a detect group numbered 10 on Router A for detecting the state of the linkbetween Router B and Router C.z When detect group 10 is reachable, use the main interface Serial0/0/0.z When detect group 10 is unreachable, enable the backup interface Serial1/0/0.II. Network diagram192.168.1.1192.168.2.1192.168.1.2/24192.168.2.2/24 20.1.1.2/2410.1.1.3/24S0/0/0:S1/0/0:10.1.1.4/24Router BRouter A Router CRouter DFigure 3-4 Network diagram for application of auto detect in interface backupIII. Configuration procedure# Enter system view.<3Com A> system-view# Assign an IP address to Serial0/0/0.[3Com A] interface serial 0/0/0[3Com A-Serial0/0/0] ip address 192.168.1.1 24# Assign an IP address to Serial1/0/0.[3Com A-Serial0/0/0] interface serial 1/0/0[3Com A-Serial1/0/0] ip address 192.168.2.1 24[3Com A-Serial1/0/0] quit# Create a detect group numbered 10.[3Com A] detect-group 10# Add an IP address of 10.1.1.4 with sequence number 1 to the detect group, taking192.168.1.2 as the next hop.[3Com A-detect-group-10] detect-list 1 ip address 10.1.1.4 nexthop 192.168.1.2
