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AS 1 AS 2 PE1 ASBR1 ASBR2 PE2 CE4 CE1 CE2 CE3 vpnv4 RD:S NH=PE1 vpnv4 RD:S NH=ASBR2 vpnv4 RD:S NH=ASBR1 ABSR Exchange VPNv4 Routes - Option B S Update Sent to PE1: PE1:G:SSM:S:ASBR1 Update Sent to ASBR1: ASBR1:G:SSM:S:Label100:FEC-Y Update sent to ASBR2: ASBR2:G:SSM:S:PE2 Update sent to PE2: ASBR2:G:SSM:S:Label20:FEC-X ASBR2 Update to ASBR1: ASBR1:G:SSM:S:ASBR2:Label10 next-hop-self towards iBGP neighbors |