Users Guide

Table Of Contents
BFD commands..........................................................................................................................................................603
Border Gateway Protocol..............................................................................................................................................610
Sessions and peers.....................................................................................................................................................611
Martian addresses..................................................................................................................................................... 612
Route reflectors......................................................................................................................................................... 612
Multiprotocol BGP..................................................................................................................................................... 612
Attributes.....................................................................................................................................................................613
Disable announcement of ASN values.................................................................................................................. 613
Selection criteria........................................................................................................................................................ 613
Weight and local preference................................................................................................................................... 614
Multiexit discriminators............................................................................................................................................ 615
Origin............................................................................................................................................................................ 615
AS path and next-hop...............................................................................................................................................615
Best path selection....................................................................................................................................................616
More path support.....................................................................................................................................................616
Advertise cost.............................................................................................................................................................617
4-Byte AS numbers................................................................................................................................................... 617
AS number migration.................................................................................................................................................617
Graceful restart..........................................................................................................................................................618
Configure Border Gateway Protocol.....................................................................................................................618
Enable BGP................................................................................................................................................................. 619
BGP over unnumbered interfaces......................................................................................................................... 621
Configure Dual Stack............................................................................................................................................... 623
Configure administrative distance........................................................................................................................ 623
Peer templates...........................................................................................................................................................624
Neighbor fall-over..................................................................................................................................................... 628
Configure password................................................................................................................................................. 629
Fast external fallover................................................................................................................................................ 631
Passive peering..........................................................................................................................................................632
Local AS.......................................................................................................................................................................633
AS number limit......................................................................................................................................................... 634
Redistribute routes................................................................................................................................................... 635
Additional paths.........................................................................................................................................................635
MED attributes.......................................................................................................................................................... 636
Local preference attribute......................................................................................................................................636
Weight attribute........................................................................................................................................................ 637
Enable multipath........................................................................................................................................................637
Route-map filters...................................................................................................................................................... 638
Route reflector clusters...........................................................................................................................................638
Aggregate routes...................................................................................................................................................... 639
Confederations.......................................................................................................................................................... 640
Route dampening....................................................................................................................................................... 641
Timers.......................................................................................................................................................................... 642
Neighbor soft-reconfiguration............................................................................................................................... 642
Redistribute iBGP route to OSPF......................................................................................................................... 643
Example - BGP in a VLT topology.........................................................................................................................646
Example - Three-tier CLOS topology with eBGP.............................................................................................. 651
Debug BGP................................................................................................................................................................. 656
BGP commands.........................................................................................................................................................656
Equal cost multi-path.....................................................................................................................................................697
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