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Scr 76 38 OPEN Message 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Version My Autonomous System Hold Time BGP Identifier Opt. Parm. Len. Optional Parameters 317 0901_04F9_c3 77 © 1999, Cisco Systems, Inc. Capabilities Negotiation • Allows for the advertisement of capabilities (type 2) • Backwards compatible New error subcode introduced to indicate which capabilities are not supported—the session must be reset 317 0901_04F9_c3 Capability Code (1 Octet) Capability Length (1 Octet) Capability Value (Variable) draft-ietf-idr-bgp4-cap-neg, Feb.

Clusters with Multiple RRs • A and B are core routers Carry routes to the rest of the network RR-A RR-B RR-C Cluster-id 5 • Symptom RR-C is not receiving any routes Lines Represent Physical and Logical Connections 317 0901_04F9_c3 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. 5 C is configured with the same cluster-id as A and B! 317 0901_04F9_c3 routerC: ! router bgp 1 bgp cluster-id 5 … ! © 1999, Cisco Systems, Inc. 69 Clusters with Multiple RRs • Solution In hierarchical route reflector configurations, each level must have a different cluster-id Recommendation: use a different cluster-id per route reflector 317 0901_04F9_c3 © 1999, Cisco Systems, Inc.

Scr 78 39 Capabilities Negotiation • Current capabilities 317 0901_04F9_c3 1 multiprotocol 128 route refresh 129 outbound route filter © 1999, Cisco Systems, Inc. x [soft] in 317 0901_04F9_c3 © 1999, Cisco Systems, Inc. Copyright © 1998, Cisco Systems, Inc. All rights reserved. Printed in USA. x IP address of a peer * all peers ASN all peers in an AS external all external peers peer-group all peers in a peer-group 317 0901_04F9_c3 © 1999, Cisco Systems, Inc. 81 Outbound Route Filter Capability • Allows for the use of the neighbor’s inbound prefix-list as part of the local outbound policy (Currently only for IPv4 unicast NLRI) Reduces the number of updates 5 sec.

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