Simple MPLS Packet Flow
I want to tell about simple MPLS packet Flow All core Routers(PE1,PE2,P1,P2) run IGP protocol(ISIS or OSPF) and MPLS LDP. IGP Phase(OSPF): PE2 advertise 20.20.20.0/30 network to OSPF and core routers learn that prefix. LDP Phase: PE2 locate label 20.20.20.0/30 as FEC(forwarding Equivalent Class): 20.20.20.0/30:Label3 and advertised to P2(upstream device). P2 locate label 20.20.20.0/30 as FEC: 20.20.20.0/30: Label300 and advertised to P1(upstream device). P1 locate Label 20.20.20.0/30 as FEC: 20.20.20.0/30: Label200 and advertised to PE1(upstream device). PE1 locate Label 20.20.20.0/30 as FEC:20.20.20.0/30: Label100 and advertised to upstream device(currently not have) 1. Host1 Operation:"ping 20.20.20.2 -Forwarding Lookup based on Destination IP and Out-Interface: IntH1 -TTL handling:TTL is 127 and reduce 126 -Ethernet-Frame: Ethernet Header: Src-MAC:Host1-mac, Dest-MAC:CE1-IntA2-MAC, Ether-Type(0x0800: IPv4) IP Header: src-IP:10.10.10.2, Dest:20...

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