BGP: Difference between revisions
→Confederation
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*AS_PATH attribute contains AS_CONFED_SET parameter which is modified inside the confederation only
*In case the confederation runs one IGP, NEXT_HOP, MED, LOCAL_PREF do not change when routing update traverses Intra-Confederation eBGP
; Config:
Source: [https://networklessons.com/bgp/bgp-confederation-explained networklessons.com]
[R2 AS-2 SubAS-24]------------------------[R3 AS-2 SubAS-35]
R2:
R2(config)#router ospf 1
R2(config-router)#network 2.2.2.2 0.0.0.0 area 0
R2(config)#router bgp 24
R2(config-router)#bgp confederation identifier 2
R2(config-router)#bgp confederation peers 35
R2(config-router)#neighbor 3.3.3.3 remote-as 35
R2(config-router)#neighbor 3.3.3.3 update-source loopback 0
R2(config-router)#neighbor 3.3.3.3 ebgp-multihop 2
R3:
R3(config)#router ospf 1
R3(config-router)#network 3.3.3.3 0.0.0.0 area 0
R3(config)#router bgp 35
R3(config-router)#bgp confederation identifier 2
R3(config-router)#bgp confederation peers 24
R3(config-router)#neighbor 2.2.2.2 remote-as 24
R3(config-router)#neighbor 2.2.2.2 update-source loopback 0
R3(config-router)#neighbor 2.2.2.2 ebgp-multihop 2
= Route Aggregation =
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