High-level Data Link Control, a layer-2 (data-link layer) transmission protocol. The HDLC protocol embeds information in a data frame that allows devices to control data flow and correct errors. For any HDLC communications session, one station is designated primary and the other secondary. A session can use one of the following connection modes, which determine how the primary and secondary stations interact.
Normal unbalanced: The secondary station responds only to the primary station.
Asynchronous: The secondary station can initiate a message.
Asynchronous balanced: Both stations send and receive over its part of a duplex line. This mode is used for X.25 packet-switching networks.
The Link Access Procedure-Balanced (LAP-B) and Link Access Procedure D-channel (LAP-D) protocols are subsets of HDLC.
Q: Now question comes why it is called cisco HDLC? because cisco added some very important features like:
1. Keepalive Mechanism
2. Added serial link address resolution protocol (SLARP), It is used for the purpose of auto-installation like when router boot up so to fine the TFTP server, get the configuration including IP address etc.
I hope it will be informative for you!
3. Added STAC compression, Its a good one but very processor heavy.
4. Performance Increase (7 - 12 Byte), The header size is increase and this is the beauty of HDLC and works efficiently across WAN.
I Hope this will be informative for You!
4 comments:
i am not sure if HDLC is still valid in market ?
Yes u r right?
The Industry standard is PPP and yet very cool!
And supported on most connection synchronous (pt-to-pt) and Asynchronous (modem) and is quite feature rictic (Authentication, compression, Multiprotocol encapsulation, Multilink, call-back etc
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