Users Guide

Table Of Contents
BFD commands..........................................................................................................................................................607
Border Gateway Protocol.............................................................................................................................................. 613
Sessions and peers.................................................................................................................................................... 614
Martian addresses..................................................................................................................................................... 615
Route reflectors......................................................................................................................................................... 615
Multiprotocol BGP..................................................................................................................................................... 616
Attributes.....................................................................................................................................................................616
Disable announcement of ASN values.................................................................................................................. 616
Selection criteria........................................................................................................................................................ 617
Weight and local preference................................................................................................................................... 617
Multiexit discriminators............................................................................................................................................ 618
Origin.............................................................................................................................................................................618
AS path and next-hop...............................................................................................................................................619
Best path selection....................................................................................................................................................619
More path support....................................................................................................................................................620
Advertise cost............................................................................................................................................................620
4-Byte AS numbers.................................................................................................................................................. 620
AS number migration.................................................................................................................................................621
Graceful restart..........................................................................................................................................................621
Configure Border Gateway Protocol.................................................................................................................... 622
Enable BGP.................................................................................................................................................................622
BGP over unnumbered interfaces.........................................................................................................................625
Configure Dual Stack............................................................................................................................................... 626
Configure administrative distance.........................................................................................................................627
Peer templates...........................................................................................................................................................628
Neighbor fall-over......................................................................................................................................................631
Configure password..................................................................................................................................................633
Fast external fallover................................................................................................................................................634
Passive peering..........................................................................................................................................................635
Local AS.......................................................................................................................................................................636
AS number limit..........................................................................................................................................................637
Redistribute routes................................................................................................................................................... 638
Additional paths.........................................................................................................................................................639
MED attributes.......................................................................................................................................................... 639
Local preference attribute......................................................................................................................................639
Weight attribute........................................................................................................................................................ 640
Enable multipath.........................................................................................................................................................641
Route-map filters.......................................................................................................................................................641
Route reflector clusters...........................................................................................................................................642
Aggregate routes...................................................................................................................................................... 643
Confederations.......................................................................................................................................................... 643
Route dampening...................................................................................................................................................... 644
Timers.......................................................................................................................................................................... 645
Neighbor soft-reconfiguration...............................................................................................................................646
Redistribute iBGP route to OSPF..........................................................................................................................647
Example - BGP in a VLT topology.........................................................................................................................649
Example - Three-tier CLOS topology with eBGP..............................................................................................654
Debug BGP................................................................................................................................................................. 659
BGP commands.........................................................................................................................................................660
Equal cost multi-path.....................................................................................................................................................700
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