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1 28 msec 28 msec 32 msec Lines Represent Physical Connections 2210 1351_06_2000_c2 © 2000, Cisco Systems, Inc. 1, via Ethernet2/1/1 * directly connected, via Ethernet1 Addresses on Same Subnet! 2210 1351_06_2000_c2 77 © 2000, Cisco Systems, Inc. 1 next-hop-self ! 255 s0 250 2210 1351_06_2000_c2 © 2000, Cisco Systems, Inc. ) • Solution Establish the eBGP peering permanently through the “backup” link A-RR B Use LOCAL_PREF or MED to break any tie! C-RR D Lines Represent Physical Connections 2210 1351_06_2000_c2 © 2000, Cisco Systems, Inc.
2) O rigin IG P,m etric 20,localpref100,valid,internal,best • Same paths, but different result! 2210 1351_06_2000_c2 © 2000, Cisco Systems, Inc. 1) O rigin IG P,m etric 0,localpref100,valid,internal,best • Different result…again!! 2210 1351_06_2000_c2 © 2000, Cisco Systems, Inc. 60 Deterministic MED • By default, the prefixes are compared in order of arrival it may result in inconsistent decisions use bgp deterministic-med the bestpath is recalculated as soon as the command is entered enable in all the routers in the AS 2210 1351_06_2000_c2 © 2000, Cisco Systems, Inc.
Common Problems • Missing routes • Routing loops and “close calls” 2210 1351_06_2000_c2 © 2000, Cisco Systems, Inc. 70 Missing Routes—Symptoms • At least one route is missing from at least one router in the network. 2 4 1 7 7 1 0 0 00:04:18 0 2210 1351_06_2000_c2 71 © 2000, Cisco Systems, Inc. 0 % N etw ork notin table 2210 1351_06_2000_c2 © 2000, Cisco Systems, Inc. 1 route-reflector-client Same Cluster-ID! 3 0 100 0 2 i 2210 1351_06_2000_c2 73 © 2000, Cisco Systems, Inc. 0/8 -to:reflected from the sam e cluster; 2210 1351_06_2000_c2 © 2000, Cisco Systems, Inc.