Users Guide

Table Of Contents
BFD commands..........................................................................................................................................................604
Border Gateway Protocol...............................................................................................................................................611
Sessions and peers.................................................................................................................................................... 612
Martian addresses..................................................................................................................................................... 613
Route reflectors......................................................................................................................................................... 613
Multiprotocol BGP..................................................................................................................................................... 613
Attributes.....................................................................................................................................................................614
Disable announcement of ASN values.................................................................................................................. 614
Selection criteria........................................................................................................................................................ 614
Weight and local preference................................................................................................................................... 615
Multiexit discriminators............................................................................................................................................ 616
Origin............................................................................................................................................................................ 616
AS path and next-hop...............................................................................................................................................616
Best path selection....................................................................................................................................................617
More path support.....................................................................................................................................................617
Advertise cost.............................................................................................................................................................618
4-Byte AS numbers................................................................................................................................................... 618
AS number migration................................................................................................................................................ 618
Graceful restart..........................................................................................................................................................619
Configure Border Gateway Protocol.....................................................................................................................619
Enable BGP.................................................................................................................................................................620
BGP over unnumbered interfaces.........................................................................................................................622
Configure Dual Stack............................................................................................................................................... 624
Configure administrative distance........................................................................................................................ 624
Peer templates.......................................................................................................................................................... 625
Neighbor fall-over..................................................................................................................................................... 629
Configure password................................................................................................................................................. 630
Fast external fallover................................................................................................................................................632
Passive peering..........................................................................................................................................................633
Local AS.......................................................................................................................................................................634
AS number limit......................................................................................................................................................... 635
Redistribute routes................................................................................................................................................... 636
Additional paths.........................................................................................................................................................636
MED attributes...........................................................................................................................................................637
Local preference attribute...................................................................................................................................... 637
Weight attribute........................................................................................................................................................ 638
Enable multipath........................................................................................................................................................638
Route-map filters...................................................................................................................................................... 639
Route reflector clusters.......................................................................................................................................... 639
Aggregate routes...................................................................................................................................................... 640
Confederations........................................................................................................................................................... 641
Route dampening...................................................................................................................................................... 642
Timers.......................................................................................................................................................................... 643
Neighbor soft-reconfiguration............................................................................................................................... 643
Redistribute iBGP route to OSPF......................................................................................................................... 644
Example - BGP in a VLT topology......................................................................................................................... 647
Example - Three-tier CLOS topology with eBGP..............................................................................................652
Debug BGP................................................................................................................................................................. 657
BGP commands......................................................................................................................................................... 657
Equal cost multi-path.....................................................................................................................................................698
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