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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. 66 Route Reflectors • Provide additional control to allow router to advertise (reflect) iBGP learned routes to other iBGP peers Method to reduce the size of the iBGP mesh • Normal BGP speakers can coexist Only the RR has to support this feature 2210 1351_06_2000_c2 67 © 2000, Cisco Systems, Inc.

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. 61 Deterministic MED—Operation • The paths are ordered by peer-AS • The bestpath for each group is selected • The overall bestpath results from comparing the winners in each group 2210 1351_06_2000_c2 © 2000, Cisco Systems, Inc.

Route Reflectors—Terminology Route Reflector Non-Client Clusters Clients Clients Lines Represent Both Physical Links and BGP Logical Connections 2210 1351_06_2000_c2 © 2000, Cisco Systems, Inc. 68 Reflection Decisions • Once the best path is selected: From non-client reflect to all clients From client → reflect to all non-clients AND other clients From eBGP peer → reflect to all clients and non-clients 2210 1351_06_2000_c2 69 © 2000, Cisco Systems, Inc. Common Problems • Missing routes • Routing loops and “close calls” 2210 1351_06_2000_c2 © 2000, Cisco Systems, Inc.

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