network_stuff:cisco:bgp_notes
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OUTPUT OF BGP TABLE (triplet and parenthesis meaning):
show ip bgp <prefix>
x.x.x.x from y.y.y.y (RID)
- x.x.x.x: next hop to reach the destination
- y.y.y.y IP address of the router's interface who sent the update.
- RID: router-id of the spoke sending the update
Listing all routes and filtering on AS-PATH:
show ip bgp regexp ^$ # test this w/ internal networks
ASN PREPENDING
ip as-path access-list 1 permit ^$ # this indicates my own local routes
route-map BGP100_SANTANDER_TO_BGP200_FR01_DMZR01_GRE permit 10 match ip address prefix-list BGP100_SANTANDER_GRE_TO_ALL_SITES set as-path prepend 65103 65103 65103 65103 65103 #
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