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Extra resources for Cisco Networkers - Troubleshooting Bgp In Large Ip Networks

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1) O rigin IG P,m etric 30,valid,external • The bestpath will always be the same! 2210 1351_06_2000_c2 © 2000, Cisco Systems, Inc. 1) O rigin IG P,m etric 0,localpref100,valid,external,best 2210 1351_06_2000_c2 © 2000, Cisco Systems, Inc. 1) O rigin IG P,m etric 0,localpref100,valid,external,best • The “oldest” external is the bestpath. All other attributes are the same Stability enhancement! 2210 1351_06_2000_c2 © 2000, Cisco Systems, Inc. 65 Route Reflectors Playing with Mirrors 2210 1351_06_2000_c2 © 2000, Cisco Systems, Inc.

0/8 -to:reflected from the sam e cluster; 2210 1351_06_2000_c2 © 2000, Cisco Systems, Inc. ) • Clusters with multiple RRs If the RRs have the same cluster-id, all the clients must peer with all the reflectors RR B RR C A D Lines Represent Both Physical Links and BGP Logical Connections If not needed for administration, don’t assign a cluster-id for added flexibility! 2210 1351_06_2000_c2 E 75 © 2000, Cisco Systems, Inc. 2 24 msec 24 msec 24 msec Loop! 1 28 msec 28 msec 32 msec Lines Represent Physical Connections 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. ) • Clusters with multiple RRs If the RRs have the same cluster-id, all the clients must peer with all the reflectors RR B RR C A D Lines Represent Both Physical Links and BGP Logical Connections If not needed for administration, don’t assign a cluster-id for added flexibility!

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Cisco Networkers - Troubleshooting Bgp In Large Ip Networks


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