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February 2012

HDLC 101

1. Basic Configuration The default encapsulation on serial interfaces on a Cisco Router is HDLC. Even though HDLC exists as an open standard, Cisco routers use a modified version of the original standard that includes a new field in the header used for identification of the upper layer protocol that …

Frame Relay Encapsulations – IETF vs Cisco

When configuring a Frame Relay interface, the first thing you should do is enable Frame Relay Encapsulation. This is usually a fairly simple task, just use the classic encapsulation frame-relay command and it will work. Actually there are 3 options: The first one is MultiLink Frame Relay but this deals with …

Frame Relay 101 – part 2

If you thought the previous Frame Relay 101 would cover all basic aspects of Frame Relay, you were wrong. Here’s more info on Frame Relay and how it works, and believe me, we are looking just at the tip of the iceberg here 🙂 7. Non-Broadcast. What difference does it make? The omnipresent nowadays …

Frame Relay 101

Frame Relay is a Layer 2 WAN technology that uses the concept of virtual circuits to transport data. The Frame Relay network is packet switched, but packets towards a destination share a common label, so they follow a strict path according to the label, giving the impression of an end-to-end …