BGP: Difference between revisions
→Community
Line 205:
neighbor x.x.x.x send-community
*BGP has default 4 well known communities that can be used to mark prefixes
Internet: advertise these routes to all neighbors.
Local-as: prevent sending routes outside the local As within the confederation.
No-Advertise: do not advertise this route to any peer, internal or external.
No-Export: do not advertise this route to external BGP peers.
*Communities can be used to mark a set of prefixes that share a common property.
*Upstream providers can use these marks to apply a common routing policy such as filtering or assigning a specific local preference.
*Set community attribute values by:
Network command
Aggregate address
Neighbor command
Redistribution
*Configuration
ip bgp-community new-format
route-map SETCOM
set community 1:10
router bgp 12
neighbor 192.168.12.2 remote-as 12
neighbor 192.168.12.2 send-community
network 150.1.1.0 mask 255.255.255.0 route-map SETCOM ==> Network 150.1.1.0 is advertised with community 1:10
= Route Aggregation =
= Synchronization =
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