Here is a basic Cisco BGP commands
1. How do I remove a neighbor?
router(config)# router bgp
router(config-router)# no neighbor
2. How do I shutdown a session?
router(config)# router bgp
router(config-router)# neighbor shutdown
router(config)# router bgp
router(config-router)# no neighbor shutdown
3. How do I clear or restart a session?
router# clear ip bgp
4. How do I clear BGP session without hard reset?
router# clear ip bgp soft out
5. How do I clear all BGP sessions?
router# clear ip bgp neighbor *
6. How do I display all BGP routes that contain subnet and supernet netmask?
router# show ip bgp cidr-only
7. How do I display routes that belong to the specified communities?
router# show ip bgp community community-number [exact]
8. How do I display routes that are permitted by community list?
router# show ip bgp community-list community-number [exact]
9. How do I display routes that are matched by the specified autonomouse system path access list?
router# show ip bgp filter-list access-list-number
10. How do I display the routes with inconsistent originating autonomous systems?
router# show ip bgp inconsistent-as
11. How do I display the routes that match the specified regular expression entered on the command line?
router# show ip bgp regexp regular-expression
12. How do I display the contents of the BGP routing table?
router# show ip bgp [network][network-mask][subnets]
13. How do I display routes learned from a paticular BGP neighbor?
router# show ip bgp neighbor [address][received-routes | routes | advertised
-routes | paths regular-expression | dampened-routes]
14. How do I display all BGP paths in the database?
router# show ip bgp paths
15. How do I display information about BGP peer groups?
router# show ip bgp peer-group [tag][summary]
16. How do I display the status of all BGP connections?
router# show ip bgp summary
17. How do I look at a BGP session to see if it is up?
router# show ip bgp neighbor
18. How do I see what routes are being seen?
router# show ip bgp neighbor routes
19. How do I see what routes are being advertised?
router# show ip bgp neighbor advertised-routes
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