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BGP Best Path Selection Algorithm [IP Routing]
Border Gateway Protocol (BGP) routers typically receive multiple paths to the same destination. The BGP best path algorithm decides which is the best path to install in the IP routing table and to use for traffic forwarding.
References: 33 TAC | 9 Support Community - View All
www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094431.shtml
21 May 2012
How BGP Routers Use the Multi-Exit Discriminator for Best Path Selection [IP Routing]
This document demonstrates the use of the bgp deterministic-med command and explains how it can effect multi-exit discriminator (MED)-based path selection.
www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094934.shtml
23 Mar 2012
How the bgp deterministic-med Command Differs from the bgp always-compare-med Command [IP Routing]
There is sometimes confusion between the two Border Gateway Protocol (BGP) configuration commands bgp deterministic-med and bgp always-compare-med. This document explains the differences in how the bgp deterministic-med and bgp always-compare-med commands can affect...
www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094925.shtml
10 Aug 2005
BGP Case Studies
This document contains five Border Gateway Protocol (BGP) case studies.
References: 57 TAC | 12 Support Community - View All
www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800c95bb.shtml
30 Oct 2008
Border Gateway Protocol (BGP)
...Design TechNotes) BGP Best Path Selection Algorithm BGP Peer Groups ...Memory Consumption BGP Best Path Selection Algorithm BGP Case Studies ...
www.cisco.com/en/US/tech/tk365/tk80/tsd_technology_support_sub-protocol_home.html
09 Oct 2010
Load Sharing with BGP in Single and Multihomed Environments: Sample Configurations [IP Routing]
Load sharing allows a router to distribute the outgoing and incoming traffic among multiple paths. The paths are derived either statically or with dynamic protocols, such as:
References: 36 TAC | 6 Support Community - View All
www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00800945bf.shtml
23 Aug 2005
BGP Commands: A through B - Cisco IOS IP Routing: BGP Command Reference [Support]
...The results of the selection algorithm also changed because the order in which the paths were received was different...session. Router# show ip bgp 10.100.0.0 BGP...Paths: (3 available, best #3, advertised over...valid, internal, best If the bgp deterministic-med command...then the result of the selection algorithm will always be the same...the order in which the paths are received by the local...
References: 11 TAC | 1 Support Community - View All
www.cisco.com/en/US/docs/ios/iproute_bgp/command/reference/irg_bgp1.html
20 Jul 2011
How to Use HSRP to Provide Redundancy in a Multihomed BGP Network
This document describes how to provide redundancy in a multihomed Border Gateway Protocol (BGP) network where you have connections to two separate Internet service providers (ISPs). In the event of a failure of connectivity toward one ISP, the traffic is rerouted dynamically through the other...
www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a0080093f2c.shtml
10 May 2006
Implementing BGP on Cisco IOS XR Software [Support]
...disable the comparison. SeeBGP Best Path Algorithm for information on the BGP best-path selection process. The BGP cost community...
www.cisco.com/en/US/docs/routers/xr12000/software/xr12k_r4.1/routing/configuration/guide/routing_cg41xr12k_chapter1.html
29 Apr 2011
Configuring Basic BGP - Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 5.x [Cisco Nexus 7000 Series Switches]
This chapter describes how to configure basic BGP on the Cisco Nexus 7000 series switches running Cisco NX-OS release 5.0(2) and later releases.
References: 8 TAC
www.cisco.com/en/US/docs/switches/datacenter/sw/5_x/nx-os/unicast/configuration/guide/l3_bgp.html
25 Oct 2010