1-17*> 6.6.6.0/24 1.1.3.1 0 300 100i*> 7.7.7.0/24 1.1.3.1 0 300 200i*> 8.8.8.0/24 1.1.3.1 0 300 200i*> 9.9.9.0/24 1.1.3.1 0 300 200iThe display above shows that Switch D has learned routes 4.4.4.0/24, 5.5.5.0/24, and 6.6.6.0/24 fromAS 100 and 7.7.7.0/24, 8.8.8.0/24, and 9.9.9.0/24 from AS 200.3) Configure Switch D to reject routes from AS 200.# Configure AS_PATH list 1 on Switch D.[SwitchD] ip as-path 1 permit .*200.*# Configure a route policy named rt1 on Switch D.[SwitchD] route-policy rt1 deny node 1[SwitchD] if-match as-path 1[SwitchD] route-policy rt2 permit node 2# On Switch D, specify route policy rt1 to filter routes received from peer 1.1.3.1.[SwitchD] bgp 400[SwitchD] peer 1.1.3.1 route-policy rt1 import# Display the BGP routing table information of Switch D.[SwitchD] display bgp routing-tableTotal Number of Routes: 3BGP Local router ID is 4.4.4.4Status codes: * - valid, > - best, d - damped,h - history, i - internal, s - suppressed, S - StaleOrigin : i - IGP, e - EGP, ? - incompleteNetwork NextHop MED LocPrf PrefVal Path/Ogn*> 4.4.4.0/24 1.1.3.1 0 300 100i*> 5.5.5.0/24 1.1.3.1 0 300 100i*> 6.6.6.0/24 1.1.3.1 0 300 100iThe display above shows that Switch D has learned only routes 4.4.4.0/24, 5.5.5.0/24, and 6.6.6.0/24from AS 100.Troubleshooting Route Policy ConfigurationIPv4 Routing Information Filtering FailureSymptomFiltering routing information failed, while the routing protocol runs normally.
