Avaya Configuring IP Exterior Gateway Protocols (BGP and EGP) Manual de usuario

BayRS Version 15.0Part No. 308628-15.0 Rev 00June 2001600 Technology Park DriveBillerica, MA 01821-4130Configuring IP Exterior Gateway Protocols(BGP

Configuring IP Exterior Gateway Protocols (BGP and EGP)4-18308628-15.0 Rev 00Setting the Route Echo SwitchThe peer route echo switch controls the way

Configuring BGP Peers308628-15.0 Rev 004-19 Using the BCCTo set the peer route echo switch, go to a BGP peer prompt (for example, box; ip; bgp; peer/2

Configuring IP Exterior Gateway Protocols (BGP and EGP)4-20308628-15.0 Rev 00Disabling and Reenabling Loop DetectionBy default, BGP resets a peer-to-p

Configuring BGP Peers308628-15.0 Rev 004-21 Configuring Peers over an Unnumbered Point-to-Point LinkYou cannot configure a BGP peer-to-peer session di

Configuring IP Exterior Gateway Protocols (BGP and EGP)4-22308628-15.0 Rev 00To establish a peer-to-peer session between router A and router B: 1.Sele

Configuring BGP Peers308628-15.0 Rev 004-23 When you enable BGP-4 TCP MD5 authentication, the router computes an MD5 signature for each TCP packet, ba

Configuring IP Exterior Gateway Protocols (BGP and EGP)4-24308628-15.0 Rev 00You can enter the authentication keys using the BCC or Site Manager. Use

Configuring BGP Peers308628-15.0 Rev 004-25 Verifying MD5 Signatures on Received BGP TCP PacketsUpon receiving a packet, TCP performs three tests.• If

Configuring IP Exterior Gateway Protocols (BGP and EGP)4-26308628-15.0 Rev 00Using the BCCTo set the BGP-4 authentication parameters, go to the BGP pe

Configuring BGP Peers308628-15.0 Rev 004-27 Using Site ManagerTo set BGP-4 authentication parameters, complete the following steps:Site Manager Proced

308628-15.0 Rev 00 xiFiguresFigure 1-1. Internetwork Segmented into Three Autonomous Systems ...1-2Figure 1-2. BGP Connecting Two A

308628-15.0 Rev 005-1 Chapter 5Configuring BGP Accept and Announce PoliciesAccept and announce policies control the flow of routing information in and

Configuring IP Exterior Gateway Protocols (BGP and EGP)5-2308628-15.0 Rev 00When a BGP speaker receives a route in an update message, it applies any l

Configuring BGP Accept and Announce Policies308628-15.0 Rev 005-3 Using the BCCTo create a BGP accept policy, go to the BGP prompt (for example, box;

Configuring IP Exterior Gateway Protocols (BGP and EGP)5-4308628-15.0 Rev 00Table 5-1. BCC Definition Parameters for BGP Accept PoliciesParameter Valu

Configuring BGP Accept and Announce Policies308628-15.0 Rev 005-5 For example, the following command sequence causes BGP to accept routes that match p

Configuring IP Exterior Gateway Protocols (BGP and EGP)5-6308628-15.0 Rev 00Specifying Match Criteria for a BGP Accept PolicyYou can use the BCC or Si

Configuring BGP Accept and Announce Policies308628-15.0 Rev 005-7 Table 5-2. BCC Match Parameters for BGP Accept PoliciesParameter Values Functionas-p

Configuring IP Exterior Gateway Protocols (BGP and EGP)5-8308628-15.0 Rev 00network* List of IP addresses Specifies the networks that match this polic

Configuring BGP Accept and Announce Policies308628-15.0 Rev 005-9 Using Site ManagerTo specify match criteria for a BGP accept policy, complete the fo

Configuring IP Exterior Gateway Protocols (BGP and EGP)5-10308628-15.0 Rev 00Supplying Modification Values for a BGP Accept PolicyYou can use the BCC

Configuring BGP Accept and Announce Policies308628-15.0 Rev 005-11 For example, the following command sequence specifies an override MED value of 10 f

Configuring IP Exterior Gateway Protocols (BGP and EGP)5-12308628-15.0 Rev 00Using Site ManagerTo supply modification values for a BGP accept policy,

Configuring BGP Accept and Announce Policies308628-15.0 Rev 005-13 Configuring a BGP Announce PolicyBGP announce policies determine which routes in th

Configuring IP Exterior Gateway Protocols (BGP and EGP)5-14308628-15.0 Rev 00Using the BCCTo create a BGP announce policy, go to the BGP prompt (for e

Configuring BGP Accept and Announce Policies308628-15.0 Rev 005-15 Using Site ManagerTo create a BGP announce policy, complete the following steps:Sit

Configuring IP Exterior Gateway Protocols (BGP and EGP)5-16308628-15.0 Rev 00Specifying Match Criteria for a BGP Announce PolicyYou can use the BCC or

Configuring BGP Accept and Announce Policies308628-15.0 Rev 005-17 Table 5-5. BCC Match Parameters for BGP Announce PoliciesParameter Values Functiona

Configuring IP Exterior Gateway Protocols (BGP and EGP)5-18308628-15.0 Rev 00community*no-exportno-advertiseno-export-subconfedList of BGP communities

Configuring BGP Accept and Announce Policies308628-15.0 Rev 005-19 network* List of IP addresses Specifies which networks will match this policy. Each

308628-15.0 Rev 00xiiiTablesTable 1-1. BGP-3 Path Attributes ...1-9Table 1-

Configuring IP Exterior Gateway Protocols (BGP and EGP)5-20308628-15.0 Rev 00ExamplesThe following command sequence configures the router to advertise

Configuring BGP Accept and Announce Policies308628-15.0 Rev 005-21 Using Site ManagerTo specify match criteria for a BGP-4 announce policy, complete t

Configuring IP Exterior Gateway Protocols (BGP and EGP)5-22308628-15.0 Rev 00Supplying Modification Values for a BGP Announce PolicyYou can use the BC

Configuring BGP Accept and Announce Policies308628-15.0 Rev 005-23 as-path-prepend null (default)List of AS numbersSpecifies AS numbers that BGP adds

Configuring IP Exterior Gateway Protocols (BGP and EGP)5-24308628-15.0 Rev 00origin none (default)igpegpincompleteSpecifies an origin attribute overri

Configuring BGP Accept and Announce Policies308628-15.0 Rev 005-25 For example, the following command sequence configures the router to advertise netw

Configuring IP Exterior Gateway Protocols (BGP and EGP)5-26308628-15.0 Rev 007. Set the following parameters:• Advertise• Multi-Exit Discriminator• Mu

Configuring BGP Accept and Announce Policies308628-15.0 Rev 005-27 Configuring BGP-4 AS Path Pattern-MatchingTable 5-7 describes the special character

308628-15.0 Rev 006-1 Chapter 6Configuring a Route ReflectorTo avoid the resource cost of a full-mesh topology to support IBGP speakers within a large

Configuring IP Exterior Gateway Protocols (BGP and EGP)6-2308628-15.0 Rev 00Figure 6-1, for example, shows an AS with a single route reflector connect

Configuring a Route Reflector308628-15.0 Rev 006-3 Configuring a Single Route Reflector in an ASAn IBGP route reflector (RR) is an IBGP speaker that h

Configuring IP Exterior Gateway Protocols (BGP and EGP)6-4308628-15.0 Rev 00Using Site ManagerTo configure an IBGP speaker as a route reflector, compl

Configuring a Route Reflector308628-15.0 Rev 006-5 Configuring a Route Reflector ClusterYou can connect multiple route reflectors in a route reflector

Configuring IP Exterior Gateway Protocols (BGP and EGP)6-6308628-15.0 Rev 00Using Site ManagerTo establish a peer-to-peer session with another route r

Configuring a Route Reflector308628-15.0 Rev 006-7 Configuring Multiple RR Clusters in an ASAn AS can contain multiple IBGP route reflector clusters.

Configuring IP Exterior Gateway Protocols (BGP and EGP)6-8308628-15.0 Rev 00At the session-specific prompt, enter the following command to specify tha

Configuring a Route Reflector308628-15.0 Rev 006-9 To associate a route reflector with a cluster, complete the following steps:10. Click on OK. You re

Configuring IP Exterior Gateway Protocols (BGP and EGP)6-10308628-15.0 Rev 00Configuring an RR ClientAn RR client is a BGP/IBGP speaker with a peer-to

Configuring a Route Reflector308628-15.0 Rev 006-11 Using Site ManagerTo establish a peer-to-peer session between an RR client and a route reflector,

308628-15.0 Rev 00xv PrefaceRouters at the borders or edges of autonomous systems are called gateways. These gateways use exterior gateway protocols t

308628-15.0 Rev 007-1 Chapter 7Configuring Route and Traffic BalancingBGP route balancing and traffic balancing are two techniques that allow a BGP sp

Configuring IP Exterior Gateway Protocols (BGP and EGP)7-2308628-15.0 Rev 00Figure 7-1. BGP/OSPF Autonomous SystemAssume for this example that OSPF is

Configuring Route and Traffic Balancing308628-15.0 Rev 007-3 Now consider that BGP on router F receives advertisements to three destinations (destinat

Configuring IP Exterior Gateway Protocols (BGP and EGP)7-4308628-15.0 Rev 00Figure 7-3 shows the six traffic-balancing BGP ECMP entries to the routing

Configuring Route and Traffic Balancing308628-15.0 Rev 007-5 Using Site ManagerTo configure IBGP for ECMP route or traffic balancing, complete the fol

Configuring IP Exterior Gateway Protocols (BGP and EGP)7-6308628-15.0 Rev 00The following conditions must apply:• The local BGP router and the remote

Configuring Route and Traffic Balancing308628-15.0 Rev 007-7 Assume that the IP routing table on the BGP router in the local AS contains two ECMP stat

Configuring IP Exterior Gateway Protocols (BGP and EGP)7-8308628-15.0 Rev 00Using the BCCTo configure EBGP ECMP for route balancing or traffic balanci

Configuring Route and Traffic Balancing308628-15.0 Rev 007-9 ip# bgpbgp# router-id 201.1.1.1bgp# local-as 11bgp# multi-hop enabledbgp# peer 201.1.1.1/

Configuring IP Exterior Gateway Protocols (BGP and EGP)xvi308628-15.0 Rev 00Text ConventionsThis guide uses the following text conventions:angle brack

308628-15.0 Rev 008-1 Chapter 8Customizing EGP ServicesThis chapter explains how to configure the Exterior Gateway Protocol (EGP).Topic PageEGP Concep

Configuring IP Exterior Gateway Protocols (BGP and EGP)8-2308628-15.0 Rev 00EGP Concepts and TerminologyEGP-2 is an exterior gateway protocol used to

Customizing EGP Services308628-15.0 Rev 008-3 An EGP router does the following:• Acquires EGP neighbors• Determines neighbor reachability• Exchanges n

Configuring IP Exterior Gateway Protocols (BGP and EGP)8-4308628-15.0 Rev 00In the neighbor reachability phase, EGP is responsible for monitoring and

Customizing EGP Services308628-15.0 Rev 008-5 EGP Implementation NotesThis section provides you with some important guidelines to follow when you conf

Configuring IP Exterior Gateway Protocols (BGP and EGP)8-6308628-15.0 Rev 00Customizing EGP on the RouterYou customize EGP on the router by setting EG

Customizing EGP Services308628-15.0 Rev 008-7 Supplying a Local AS NumberEach autonomous system has a NIC-assigned decimal number ID. You must supply

Configuring IP Exterior Gateway Protocols (BGP and EGP)8-8308628-15.0 Rev 00Specifying the Neighbor’s AddressYou define the neighbor-to-neighbor relat

Customizing EGP Services308628-15.0 Rev 008-9 Specifying the Gateway ModeYou can configure the EGP router to operate in one of two gateway modes for a

Preface308628-15.0 Rev 00xvii italic text Indicates new terms, book titles, and variables in command syntax descriptions. Where a variable is two or m

Configuring IP Exterior Gateway Protocols (BGP and EGP)8-10308628-15.0 Rev 00Enabling and Disabling the Neighbor RelationshipWhen you establish a neig

Customizing EGP Services308628-15.0 Rev 008-11 Choosing the Acquisition ModeIn an EGP neighbor relationship, one router is the active neighbor and the

Configuring IP Exterior Gateway Protocols (BGP and EGP)8-12308628-15.0 Rev 00Choosing the Poll ModeThe type of neighbor reachability algorithm execute

Customizing EGP Services308628-15.0 Rev 008-13 Setting Neighbor TimersEGP uses two configurable timers: the Hello timer and the poll timer.The Hello t

308628-15.0 Rev 00A-1 Appendix ASite Manager ParametersThis appendix contains the Site Manager parameter descriptions for BGP and EGP services. Parame

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-2308628-15.0 Rev 00The Technician Interface allows you to modify parameters by issuing set an

Site Manager Parameters308628-15.0 Rev 00A-3 BGP Configuration ParametersParameter: IdentifierPath: Choose BGP in the Select Protocols window.Default:

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-4308628-15.0 Rev 00BGP Global ParametersParameter: BGP EnablePath: Configuration Manager >

Site Manager Parameters308628-15.0 Rev 00A-5 Parameter: BGP Intra-ASPath: Configuration Manager > Protocols > IP > BGP > BGP GlobalDefault

Configuring IP Exterior Gateway Protocols (BGP and EGP)xviii308628-15.0 Rev 00AcronymsThis guide uses the following acronyms:ARP Address Resolution Pr

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-6308628-15.0 Rev 00Parameter: Max Redundant RoutesPath: Configuration Manager > Protocols

Site Manager Parameters308628-15.0 Rev 00A-7 Parameter: Multi-hop EBGP ConnectionPath: Configuration Manager > Protocols > IP > BGP > BGP

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-8308628-15.0 Rev 00Parameter: Cluster IdentifierPath: Configuration Manager > Protocols &g

Site Manager Parameters308628-15.0 Rev 00A-9 Parameter: Route with MEDPath: Configuration Manager > Protocols > IP > BGP > BGP GlobalDefau

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-10308628-15.0 Rev 00Parameter: Confederation IDPath: Configuration Manager > Protocols >

Site Manager Parameters308628-15.0 Rev 00A-11 BGP-3 Global ParameterBGP-4 Global ParameterBGP Peer ParametersParameter: EnablePath: Configuration Mana

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-12308628-15.0 Rev 00Parameter: Peer ASPath: Configuration Manager > Protocols > IP >

Site Manager Parameters308628-15.0 Rev 00A-13 Parameter: EnablePath: Configuration Manager > Protocols > IP > BGP > Peers > BGP PeersDe

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-14308628-15.0 Rev 00Parameter: External Advertisement TimerPath: Configuration Manager > P

Site Manager Parameters308628-15.0 Rev 00A-15 Parameter: HoldtimePath: Configuration Manager > Protocols > IP > BGP > Peers > BGP Peers

Preface308628-15.0 Rev 00xix PPP Point-to-Point ProtocolPVC permanent virtual circuitRARP Reverse Address Resolution ProtocolRFC request for commentsR

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-16308628-15.0 Rev 00Parameter: Min AS Origination IntervalPath: Configuration Manager > Pr

Site Manager Parameters308628-15.0 Rev 00A-17 Parameter: Peer Route Echo SwitchPath: Configuration Manager > Protocols > IP > BGP > Peers

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-18308628-15.0 Rev 00Parameter: Next Hop SelfPath: Configuration Manager > Protocols > I

Site Manager Parameters308628-15.0 Rev 00A-19 Parameter: Tcp Md5 Key StoragePath: Configuration Manager > Protocols > IP > BGP > Peers >

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-20308628-15.0 Rev 00BGP AS Weight and Weight Class ParametersParameter: Tcp Md5 KeyPath: Conf

Site Manager Parameters308628-15.0 Rev 00A-21 Parameter: Weight Value 2Path: Configuration Manager > Protocols > IP > BGP > WeightsDefault

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-22308628-15.0 Rev 00Parameter: Weight Value 5Path: Configuration Manager > Protocols >

Site Manager Parameters308628-15.0 Rev 00A-23 Parameter: Weight Value 8Path: Configuration Manager > Protocols > IP > BGP > WeightsDefault

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-24308628-15.0 Rev 00BGP Event Message ParametersParameter: Peer Local/RemotePath: Configurati

Site Manager Parameters308628-15.0 Rev 00A-25 EGP ParametersEGP Global Parameters Topic PageEGP Global ParametersA-25EGP Neighbor Parameters A-26Param

ii308628-15.0 Rev 00 Copyright © 2001 Nortel NetworksAll rights reserved. June 2001.The information in this document is subject to change without noti

Configuring IP Exterior Gateway Protocols (BGP and EGP)xx308628-15.0 Rev 00Related PublicationsFor more information about IP services, refer to the fo

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-26308628-15.0 Rev 00EGP Neighbor ParametersParameter: Remote Peer IP AddressPath: Configurati

Site Manager Parameters308628-15.0 Rev 00A-27 Parameter: EnablePath: Configuration Manager > Protocols > IP > EGP > Neighbors > EGP Nei

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-28308628-15.0 Rev 00Parameter: Hello TimerPath: Configuration Manager > Protocols > IP

Site Manager Parameters308628-15.0 Rev 00A-29 Routing Policy ParametersCommon Accept Policy ParametersTopic PageAccept PoliciesCommon Accept Policy Pa

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-30308628-15.0 Rev 00Parameter: NamePath: Configuration Manager > Protocols > IP > Po

Site Manager Parameters308628-15.0 Rev 00A-31 Parameter: NetworksPath: Configuration Manager > Protocols > IP > Policy Filters > EGP >

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-32308628-15.0 Rev 00Parameter: ActionPath: Configuration Manager > Protocols > IP >

Site Manager Parameters308628-15.0 Rev 00A-33 Parameter: Route PreferencePath: Configuration Manager > Protocols > IP > Policy Filters > E

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-34308628-15.0 Rev 00EGP-Specific Accept Policy ParametersParameter: Rule PrecedencePath: Conf

Site Manager Parameters308628-15.0 Rev 00A-35 Parameter: AS ListPath: Configuration Manager > Protocols > IP > Policy Filters > EGP > A

Preface308628-15.0 Rev 00xxi How to Get HelpIf you purchased a service contract for your Nortel Networks product from a distributor or authorized rese

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-36308628-15.0 Rev 00BGP-3-Specific Accept Policy Parameters Parameter: Injection ListPath: Co

Site Manager Parameters308628-15.0 Rev 00A-37 Parameter: Peer ASPath: Configuration Manager > Protocols > IP > Policy Filters > BGP-3 >

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-38308628-15.0 Rev 00Parameter: Route OriginPath: Configuration Manager > Protocols > IP

Site Manager Parameters308628-15.0 Rev 00A-39 Parameter: BGP Communities to matchPath: Configuration Manager > Protocols > IP > Policy Filter

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-40308628-15.0 Rev 00BGP-4-Specific Accept Policy ParametersParameter: Injection ListPath: Con

Site Manager Parameters308628-15.0 Rev 00A-41 Parameter: Peer AddressPath: Configuration Manager > Protocols > IP > Policy Filters > BGP-4

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-42308628-15.0 Rev 00Parameter: Aggregator AS ListPath: Configuration Manager > Protocols &

Site Manager Parameters308628-15.0 Rev 00A-43 Parameter: BGP-4 PreferencePath: Configuration Manager > Protocols > IP > Policy Filters > B

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-44308628-15.0 Rev 00Parameter: BGP Communities to MatchPath: Configuration Manager > Proto

Site Manager Parameters308628-15.0 Rev 00A-45 Parameter: BGP Community attribute actionPath: Configuration Manager > Protocols > IP > Policy

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-46308628-15.0 Rev 00Parameter: BGP Route Flap Dampening TemplatePath: Configuration Manager &

Site Manager Parameters308628-15.0 Rev 00A-47 Parameter: Multi-Exit Discriminator ValuePath: Configuration Manager > Protocols > IP > Policy

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-48308628-15.0 Rev 00Parameter: Reuse ThresholdPath: Configuration Manager > Protocols >

Site Manager Parameters308628-15.0 Rev 00A-49 Parameter: Unreachable DecayPath: Configuration Manager > Protocols > IP > Policy Filters >

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-50308628-15.0 Rev 00Common Announce Policy ParametersParameter: Memory LimitPath: Configurati

Site Manager Parameters308628-15.0 Rev 00A-51 Parameter: NamePath: Configuration Manager > Protocols > IP > Policy Filters > EGP > Anno

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-52308628-15.0 Rev 00Parameter: NetworksPath: Configuration Manager > Protocols > IP >

Site Manager Parameters308628-15.0 Rev 00A-53 Parameter: ActionPath: Configuration Manager > Protocols > IP > Policy Filters > EGP > An

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-54308628-15.0 Rev 00Parameter: Rule PrecedencePath: Configuration Manager > Protocols >

Site Manager Parameters308628-15.0 Rev 00A-55 Parameter: Route SourcePath: Configuration Manager > Protocols > IP > Policy Filters > EGP &

308628-15.0 Rev 001-1 Chapter 1Exterior Gateway Protocols (BGP and EGP)This chapter introduces the concepts and terminology used in this guide.Autonom

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-56308628-15.0 Rev 00Parameter: AdvertisePath: Configuration Manager > Protocols > IP &g

Site Manager Parameters308628-15.0 Rev 00A-57 Parameter: From RIP GatewayPath: Configuration Manager > Protocols > IP > Policy Filters > E

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-58308628-15.0 Rev 00Parameter: Received on RIP InterfacePath: Configuration Manager > Prot

Site Manager Parameters308628-15.0 Rev 00A-59 Parameter: From OSPF Router IDPath: Configuration Manager > Protocols > IP > Policy Filters >

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-60308628-15.0 Rev 00Parameter: Received OSPF TypePath: Configuration Manager > Protocols &

Site Manager Parameters308628-15.0 Rev 00A-61 Parameter: Received OSPF TagPath: Configuration Manager > Protocols > IP > Policy Filters >

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-62308628-15.0 Rev 00Parameter: From EGP PeerPath: Configuration Manager > Protocols > I

Site Manager Parameters308628-15.0 Rev 00A-63 Parameter: From EGP ASPath: Configuration Manager > Protocols > IP > Policy Filters > EGP &g

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-64308628-15.0 Rev 00Parameter: Received EGP GatewayPath: Configuration Manager > Protocols

Site Manager Parameters308628-15.0 Rev 00A-65 Parameter: From BGP PeerPath: Configuration Manager > Protocols > IP > Policy Filters > EGP

Configuring IP Exterior Gateway Protocols (BGP and EGP)1-2308628-15.0 Rev 00Figure 1-1. Internetwork Segmented into Three Autonomous SystemsThe router

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-66308628-15.0 Rev 00Parameter: From BGP Peer ASPath: Configuration Manager > Protocols >

Site Manager Parameters308628-15.0 Rev 00A-67 Parameter: Received BGP Next HopPath: Configuration Manager > Protocols > IP > Policy Filters &

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-68308628-15.0 Rev 00EGP-Specific Announce Policy ParametersParameter: External Route SourcePa

Site Manager Parameters308628-15.0 Rev 00A-69 Parameter: EGP Interface ListPath: Configuration Manager > Protocols > IP > Policy Filters >

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-70308628-15.0 Rev 00BGP-3-Specific Announce Policy ParametersParameter: External Route Source

Site Manager Parameters308628-15.0 Rev 00A-71 Parameter: Outbound PeersPath: Configuration Manager > Protocols > IP > Policy Filters > BGP

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-72308628-15.0 Rev 00Parameter: Specific Inter-AS MetricPath: Configuration Manager > Proto

Site Manager Parameters308628-15.0 Rev 00A-73 Parameter: Next HopPath: Configuration Manager > Protocols > IP > Policy Filters > BGP-3 >

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-74308628-15.0 Rev 00BGP-4-Specific Announce Policy ParametersParameter: External Route Source

Site Manager Parameters308628-15.0 Rev 00A-75 Parameter: Outbound PeersPath: Configuration Manager > Protocols > IP > Policy Filters > BGP

Exterior Gateway Protocols (BGP and EGP)308628-15.0 Rev 001-3 Border Gateway Protocol (BGP)The Border Gateway Protocol (BGP) is an exterior gateway pr

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-76308628-15.0 Rev 00Parameter: Multi-Exit Discriminator ValuePath: Configuration Manager >

Site Manager Parameters308628-15.0 Rev 00A-77 Parameter: Replace As PathPath: Configuration Manager > Protocols > IP > Policy Filters > BG

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-78308628-15.0 Rev 00Parameter: Local Preference Override ValuePath: Configuration Manager >

Site Manager Parameters308628-15.0 Rev 00A-79 Parameter: As PatternPath: Configuration Manager > Protocols > IP > Policy Filters > BGP-4 &

Configuring IP Exterior Gateway Protocols (BGP and EGP)A-80308628-15.0 Rev 00Parameter: BGP Community attribute actionPath: Configuration Manager >

Site Manager Parameters308628-15.0 Rev 00A-81 Parameter: As PrependPath: Configuration Manager > Protocols > IP > Policy Filters > BGP-4 &

308628-15.0 Rev 00B-1 Appendix BConverting Cisco to Nortel Networks EquivalentsThis appendix shows you how to change Cisco commands and functions to N

Configuring IP Exterior Gateway Protocols (BGP and EGP)B-2308628-15.0 Rev 00Table B-1. Cisco to Nortel Networks BGP TranslationItem Cisco Configuratio

Converting Cisco to Nortel Networks Equivalents308628-15.0 Rev 00B-3 Item Cisco Configuration Text BCC Command Site Manager Logical Steps6 neighbor

Configuring IP Exterior Gateway Protocols (BGP and EGP)1-4308628-15.0 Rev 00Classless Interdomain RoutingClassless interdomain routing (CIDR) is an ad

Configuring IP Exterior Gateway Protocols (BGP and EGP)B-4308628-15.0 Rev 00Item Cisco Configuration Text BCC Command Site Manager Logical Steps9 ne

Converting Cisco to Nortel Networks Equivalents308628-15.0 Rev 00B-5 Item Cisco Configuration Text BCC Command Site Manager Logical Steps12 aggregat

Configuring IP Exterior Gateway Protocols (BGP and EGP)B-6308628-15.0 Rev 00Interpreting the Configuration Command Equivalents TableThe numbers in the

Converting Cisco to Nortel Networks Equivalents308628-15.0 Rev 00B-7 9.Announce advertisements to peer 1.1.1.1 if the update includes an AS-Path that

Configuring IP Exterior Gateway Protocols (BGP and EGP)B-8308628-15.0 Rev 00Comparing the Operational CommandsTable B-2 compares the corresponding ope

Converting Cisco to Nortel Networks Equivalents308628-15.0 Rev 00B-9 Interpreting the Operational Commands TableThe following list describes the funct

Configuring IP Exterior Gateway Protocols (BGP and EGP)B-10308628-15.0 Rev 0017.Discover the routes that the router’s packets take when traveling to d

Converting Cisco to Nortel Networks Equivalents308628-15.0 Rev 00B-11 Comparing BGP Route Selection ProcessesTable B-3 compares the Cisco and Nortel N

Configuring IP Exterior Gateway Protocols (BGP and EGP)B-12308628-15.0 Rev 00Regular Expression SymbolsTable B-4 lists the characters used in Cisco an

Converting Cisco to Nortel Networks Equivalents308628-15.0 Rev 00B-13 Nortel Networks AS Path Pattern-Matching SymbolsTable B-5 summarizes the symbols

Exterior Gateway Protocols (BGP and EGP)308628-15.0 Rev 001-5 Nortel Networks supports BGP-3 and BGP-4:• BGP-3 assumes that each advertised network is

308628-15.0 Rev 00Index-1Aaccept policiescreating, 5-2specifying match criteria, 5-6supplying modification values, 5-10acquisition mode for EGP neighb

Index-2308628-15.0 Rev 00BGP Intra-AS parameter, 3-7, A-5BGP Local AS parameter, 3-6, A-4BGP Soloist Slots parameter, 3-17, A-7BGP/OSPF interaction, 1

308628-15.0 Rev 00Index-3IIBGP (interior BGP)configuring route and traffic balancing, 7-1described, 1-6route reflector, configuring, 6-1route reflecto

Index-4308628-15.0 Rev 00OOSPF/BGP interactiondescribed, 1-10enabling, 3-9Ppath weight, AS, 3-26pattern matching, AS path, 5-27Peer Address parameterB

308628-15.0 Rev 00Index-5Received on RIP Interface (announce), A-58Received OSPF Tag (announce), A-61Received OSPF Type (announce), A-60Replace As Pat

Configuring IP Exterior Gateway Protocols (BGP and EGP)1-6308628-15.0 Rev 00Stub and Multihomed Autonomous SystemsAn AS can include one or more BGP sp

Exterior Gateway Protocols (BGP and EGP)308628-15.0 Rev 001-7 Figure 1-3. Transit ASIn Figure 1-3, AS 20 is the transit AS. It provides information ab

308628-15.0 Rev 00iiiNortel Networks Inc. Software License AgreementNOTICE: Please carefully read this license agreement before copying or using the a

Configuring IP Exterior Gateway Protocols (BGP and EGP)1-8308628-15.0 Rev 00To avoid the high costs of a full-mesh topology to support IBGP speakers w

Exterior Gateway Protocols (BGP and EGP)308628-15.0 Rev 001-9 Path AttributesA BGP-3 update message has a variable-length sequence of path attributes.

Configuring IP Exterior Gateway Protocols (BGP and EGP)1-10308628-15.0 Rev 00In addition, the BGP-4 update message can include the optional path attri

Exterior Gateway Protocols (BGP and EGP)308628-15.0 Rev 001-11 BGP-4 ConfederationsThe BGP confederation feature can reduce the size and complexity of

Configuring IP Exterior Gateway Protocols (BGP and EGP)1-12308628-15.0 Rev 00BGP Implementation NotesThe following guidelines are crucial to successfu

Exterior Gateway Protocols (BGP and EGP)308628-15.0 Rev 001-13 • Coordinate routing policies among all BGP speakers within an AS so that every BGP bor

308628-15.0 Rev 002-1 Chapter 2Starting BGP and EGP ServicesThis chapter describes how to use the BCC and Site Manager to start BGP services using def

Configuring IP Exterior Gateway Protocols (BGP and EGP)2-2308628-15.0 Rev 00router_id is the BGP router ID expressed as an octet string. The router ID

Starting BGP and EGP Services308628-15.0 Rev 002-3 Starting IP and BGP with Site ManagerBefore you can select a protocol to run on the router, you mus

iv308628-15.0 Rev 00for the security of its own data and information and for maintaining adequate procedures apart from the Software to reconstruct l

Configuring IP Exterior Gateway Protocols (BGP and EGP)2-4308628-15.0 Rev 00Deleting BGP with Site ManagerYou can delete BGP from all router circuits

Starting BGP and EGP Services308628-15.0 Rev 002-5 Deleting BGP-3 and BGP-4 with Site ManagerYou can delete BGP-3 and BGP-4 from all router circuits o

Configuring IP Exterior Gateway Protocols (BGP and EGP)2-6308628-15.0 Rev 00Starting IP and EGP with Site ManagerBefore you can select a protocol to r

Starting BGP and EGP Services308628-15.0 Rev 002-7 The instructions in this chapter show you how to start EGP using default values. For information ab

308628-15.0 Rev 003-1 Chapter 3Configuring Global BGP ParametersYou customize global BGP parameters for your AS as described under the following topic

Configuring IP Exterior Gateway Protocols (BGP and EGP)3-2308628-15.0 Rev 00Disabling and Reenabling BGPWhen you start BGP on the router, BGP is autom

Configuring Global BGP Parameters308628-15.0 Rev 003-3 5. Set the BGP Enable parameter. Click on Help or see the parameter description on page A-4.6.

Configuring IP Exterior Gateway Protocols (BGP and EGP)3-4308628-15.0 Rev 00Supplying a BGP Router IDThe BGP identifier is the IP address of an interf

Configuring Global BGP Parameters308628-15.0 Rev 003-5 Identifying the Local ASEach autonomous system in the Internet has a unique AS ID. You can use

308628-15.0 Rev 00 vContents PrefaceBefore You Begin ...

Configuring IP Exterior Gateway Protocols (BGP and EGP)3-6308628-15.0 Rev 00Disabling and Reenabling IBGP SupportBy default, BGP supports IBGP intra-A

Configuring Global BGP Parameters308628-15.0 Rev 003-7 Using Site ManagerTo disable and reenable IBGP support, complete the following steps:Specifying

Configuring IP Exterior Gateway Protocols (BGP and EGP)3-8308628-15.0 Rev 00Using the BCCTo specify the types of routes that IBGP advertises, go to th

Configuring Global BGP Parameters308628-15.0 Rev 003-9 Enabling BGP Interaction with OSPF and RIPBy default, BGP does not exchange routes with OSPF or

Configuring IP Exterior Gateway Protocols (BGP and EGP)3-10308628-15.0 Rev 00Setting the Update Interval TimerBGP periodically injects external BGP ro

Configuring Global BGP Parameters308628-15.0 Rev 003-11 Using Site ManagerTo change the minimum number of seconds between route injections, complete t

Configuring IP Exterior Gateway Protocols (BGP and EGP)3-12308628-15.0 Rev 00Using the BCCTo disable or reenable redundancy checking, go to the BGP pr

Configuring Global BGP Parameters308628-15.0 Rev 003-13 Enabling Multihop ConnectionsBy default, BGP enforces the one-hop rule for BGP peers (the remo

Configuring IP Exterior Gateway Protocols (BGP and EGP)3-14308628-15.0 Rev 00Using Site ManagerTo override the one-hop rule and allow multihop connect

Configuring Global BGP Parameters308628-15.0 Rev 003-15 Disabling and Reenabling Dynamic Policy ConfigurationBy default, BGP reconfigures IP policies

vi 308628-15.0 Rev 00Chapter 2 Starting BGP and EGP ServicesStarting BGP with the BCC ...

Configuring IP Exterior Gateway Protocols (BGP and EGP)3-16308628-15.0 Rev 00Configuring the BGP Soloist Slot MaskBy default, BGP runs as a soloist on

Configuring Global BGP Parameters308628-15.0 Rev 003-17 Using Site ManagerTo configure the BGP slot mask, complete the following steps:Disabling and R

Configuring IP Exterior Gateway Protocols (BGP and EGP)3-18308628-15.0 Rev 00Using Site ManagerTo disable or reenable route aggregation, complete the

Configuring Global BGP Parameters308628-15.0 Rev 003-19 Using the BCCTo enable or disable black hole punching, go to the BGP prompt (for example, box;

Configuring IP Exterior Gateway Protocols (BGP and EGP)3-20308628-15.0 Rev 00Using Site ManagerTo enable or disable black hole punching, complete the

Configuring Global BGP Parameters308628-15.0 Rev 003-21 Using Site ManagerTo configure BGP-4 to disregard the MED attribute in the route selection pro

Configuring IP Exterior Gateway Protocols (BGP and EGP)3-22308628-15.0 Rev 00Using the BCCFigure 3-1 shows an example of a BGP-4 confederation. In thi

Configuring Global BGP Parameters308628-15.0 Rev 003-23 Figure 3-1. BGP ConfederationSub-AS65000AS 20Router 1Router 2IP0107ARouter 3Sub-AS65001Router

Configuring IP Exterior Gateway Protocols (BGP and EGP)3-24308628-15.0 Rev 00Using Site ManagerTo configure a confederation, complete the following st

Configuring Global BGP Parameters308628-15.0 Rev 003-25 Disabling BayRS Local Preference Calculation and Route SelectionA BGP speaker calculates a loc

308628-15.0 Rev 00 viiChapter 4 Configuring BGP PeersDefining a Peer-to-Peer Session ...

Configuring IP Exterior Gateway Protocols (BGP and EGP)3-26308628-15.0 Rev 00AS_path_weight is a sum of weight values associated with AS numbers liste

Configuring Global BGP Parameters308628-15.0 Rev 003-27 Best-Route SelectionBGP uses the rules in Table 3-4 as tie-breakers to select the best BGP rou

Configuring IP Exterior Gateway Protocols (BGP and EGP)3-28308628-15.0 Rev 00For example, the following command disables BayRS BGP local preference ca

Configuring Global BGP Parameters308628-15.0 Rev 003-29 Configuring BGP Message LoggingBy default, the router logs only a few event messages generated

Configuring IP Exterior Gateway Protocols (BGP and EGP)3-30308628-15.0 Rev 00For example, the following command sequence configures the router to log

Configuring Global BGP Parameters308628-15.0 Rev 003-31 Configuring EBGP Route Flap DampingThe frequent change of network reachability information tha

Configuring IP Exterior Gateway Protocols (BGP and EGP)3-32308628-15.0 Rev 00• Maximum holddown time. If the route remains suppressed after the number

Configuring Global BGP Parameters308628-15.0 Rev 003-33 To apply the template to an inbound BGP routing update:1.Go to the BGP prompt (for example, bo

Configuring IP Exterior Gateway Protocols (BGP and EGP)3-34308628-15.0 Rev 003.Modify the accept policy by entering the following commands:action acce

Configuring Global BGP Parameters308628-15.0 Rev 003-35 Using Site ManagerTo create a route flap damping template, complete the following steps:Site M

viii 308628-15.0 Rev 00Chapter 6 Configuring a Route ReflectorConfiguring a Single Route Reflector in an AS ...

Configuring IP Exterior Gateway Protocols (BGP and EGP)3-36308628-15.0 Rev 00To apply a route flap damping template to an existing BGP accept policy,

Configuring Global BGP Parameters308628-15.0 Rev 003-37 Assigning Weight Classes and Values to an ASYou can assign a weight class to any AS number and

Configuring IP Exterior Gateway Protocols (BGP and EGP)3-38308628-15.0 Rev 006. Set the following parameters:•AS •Weight Value 1 through 8Click on Hel

308628-15.0 Rev 004-1 Chapter 4Configuring BGP PeersA BGP speaker forms a neighbor relationship by establishing a TCP connection to another BGP speake

Configuring IP Exterior Gateway Protocols (BGP and EGP)4-2308628-15.0 Rev 00Defining a Peer-to-Peer SessionTo define a peer-to-peer session, specify t

Configuring BGP Peers308628-15.0 Rev 004-3 Using Site ManagerTo define a peer-to-peer session, complete the following steps:Site Manager ProcedureYou

Configuring IP Exterior Gateway Protocols (BGP and EGP)4-4308628-15.0 Rev 00Initiating a Peer-to-Peer SessionA BGP speaker initiates a peer-to-peer co

Configuring BGP Peers308628-15.0 Rev 004-5 Using the BCCTo set the retry interval, go to a BGP peer prompt (for example, box; ip; bgp; peer/2.2.2.2/2.

Configuring IP Exterior Gateway Protocols (BGP and EGP)4-6308628-15.0 Rev 00Negotiating the BGP VersionBGP peers negotiate the version of BGP that the

Configuring BGP Peers308628-15.0 Rev 004-7 Using Site ManagerTo specify the minimum and maximum version of BGP, complete the following steps:Site Mana

308628-15.0 Rev 00 ixEGP Parameters ... A-25EG

Configuring IP Exterior Gateway Protocols (BGP and EGP)4-8308628-15.0 Rev 00Keeping the Connection AliveAfter a session is established, BGP peers peri

Configuring BGP Peers308628-15.0 Rev 004-9 Setting the External Advertisement TimerAfter a connection is established, the BGP speaker uses one or more

Configuring IP Exterior Gateway Protocols (BGP and EGP)4-10308628-15.0 Rev 00For example, the following command sets the external advertisement timer

Configuring BGP Peers308628-15.0 Rev 004-11 Specifying a Holddown TimeThe holddown time is the amount of time that either peer waits for a keepalive o

Configuring IP Exterior Gateway Protocols (BGP and EGP)4-12308628-15.0 Rev 00Using Site ManagerTo specify a holddown time, complete the following step

Configuring BGP Peers308628-15.0 Rev 004-13 For example, the following command causes BGP to wait at least 30 seconds between updates on the peer sess

Configuring IP Exterior Gateway Protocols (BGP and EGP)4-14308628-15.0 Rev 00Overriding the Local AS NumberBy default, a BGP speaker that issues an op

Configuring BGP Peers308628-15.0 Rev 004-15 Using the BCCTo specify a maximum update size, go to a BGP peer prompt (for example, box; ip; bgp; peer/2.

Configuring IP Exterior Gateway Protocols (BGP and EGP)4-16308628-15.0 Rev 00Specifying a Time-to-Live ValueEach IP data packet includes a time-to-liv

Configuring BGP Peers308628-15.0 Rev 004-17 Specifying the Next-Hop RouterA BGP update message has a path attribute called NEXT_HOP that specifies the