The difference between traditional IP network and MPLS network forwarding-Vecloud

MPLS VS IP forwarding principle 1. IP forwarding principle
The
router checks the destination IP address of the data packet and forwards the data according to the routing table. IP
network, forward data according to the IP header. In the hop-by-hop IP transmission, the longest matching search of the routing table (possibly multiple times) must be performed at each hop passed, and the speed is slow.
2.
MPLS forwarding principle The MPLS router (LER LSR) receives the MPLS data message and forwards the MPLS data message according to label forwarding. MPLS multi-protocol label switching [Multi-Protocol Label
Switching] can carry multiple routing protocols. In MPLS label forwarding, a label forwarding channel (LSP) is established for messages through pre-allocated labels. At each device that the channel passes through, only fast label switching (one search) is required.
The advantages and disadvantages of IP forwarding VS MPLS forwarding
Generally, IP uses the hop-by-hop target-only forwarding paradigm. When forwarding an IP packet, each router in the path must look up the destination IP address of the packet in the IP routing table, and then forward the packet to the next-hop router.
MPLS uses multiple protocols to establish a label switched path (LSP) on the network. LSP is almost similar to frame relay or asynchronous transfer mode (ATM) permanent virtual circuit (PVC), but there are two main differences: they are unidirectional and can be merged (all LSPs towards the same egress router can be merged into the network Somewhere). One of the protocols used in the MPLS network is the Label Distribution Protocol (LDP), which constructs an LSP based on the IP routing table, so that the MPLS network is automatically equivalent to a pure IP network in function.
1. MPLS forwarding advantages There
are very few header fields, and routers process this header efficiently; the forwarding process is simple, check the label; MPLS forwarding, still need to check the label forwarding table.
2. MPLS forwarding defects
The survival of labels depends on the IGP protocol and the routing table.
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