When an MPLS-enabled router receives an unlabeled packet, it makes the forwarding decision based on the FIB. PE2 receives that packet and sees that it is a normal IP packet based on the Ethertype value of 0x0800. We see that the ping was successful, but how did that happen? CE2 sent the packet (ping request) to its default gateway, which is PE2. ![]() We will ping from the network behind CE2 to the network behind CE1 while capturing the packets as they travel along the path. To understand how packets are routed in an MPLS network, we will take an example. We will also discuss the three operations-push, swap, pop-that can be performed by LSRs on labels. ![]() In this article, we will see how packets are routed across an MPLS network using the different data structures. In the last article, we discussed the operation of LDP in detail and then went on to look at the different data structures used in MPLS, including the LIB and LFIB.
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