1、沒有設置LOCAL-PREF之前（R5有兩條路由到200.100.50）： R5#sh ip bgp 200.100.50.0 BGP routing table entry for 200.100.50.0/24, version 4 Paths: (2 available, best #1, table Default-IP-Routing-Table) Advertised to non peer-group peers: 10.1.1.2 200 192.168.1.6 from 192.168.1.6 (200.100.50.1) Origin IGP, metric 0, localpref 100 , valid, external, best 300 200 10.1.1.2 from 10.1.1.2 (172.24.1.18) Origin IGP, localpref 100 , valid, external
結果： R5#sh ip bgp BGP table version is 5, local router ID is 1.1.1.1 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path *> 10.0.0.0 0.0.0.0 0 32768 i * 192.168.1.6 0 200 300 i * 10.1.1.2 0 0 300 i *> 200.100.50.0 192.168.1.6 0 0 200 i * 10.1.1.2 0 300 200 i
2、而設置了LOCAL-PREF后（R5優先選擇優先級高的路由）： R5#sh ip bgp 200.100.50.0 BGP routing table entry for 200.100.50.0/24, version 4 Paths: (2 available, best #1, table Default-IP-Routing-Table) Flag: 0x208 Advertised to non peer-group peers: 192.168.1.6 300 200 10.1.1.2 from 10.1.1.2 (172.24.1.18) Origin IGP, localpref 150 , valid, external, best 200 192.168.1.6 from 192.168.1.6 (200.100.50.1) Origin IGP, metric 0, localpref 100 , valid, external
結果： R5#sh ip bgp BGP table version is 4, local router ID is 1.1.1.1 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path * 10.0.0.0 10.1.1.2 0 150 0 300 i * 192.168.1.6 0 200 300 i *> 0.0.0.0 0 32768 i *> 200.100.50.0 10.1.1.2 150 0 300 200 i * 192.168.1.6 0 0 200 i
