Cisco HDLC - Factbites

Cisco HDLC - Factbites
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Topic: Cisco HDLC

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	Configuration Tasks
		Use to specify Cisco HDLC as the encapsulation method for the interface.
		Select Cisco HDLC as the encapsulation method for the interface.
		The example shows the complete configuration procedure, from configuring the SONET interface to assigning an IP address to the Cisco HDLC interface.
	www.juniper.net /techpubs/software/erx/junose53/swconfig-link/html/cisco-hdlc-config4.html (472 words)

	Generic HDLC layer for Linux
		Cisco HDLC (HDLC encapsulation used by Cisco® routers) - IP, IPv6 and IPX protocols
		Generic HDLC layer is included in the official Linux kernel, available via anonymous ftp from ftp.kernel.org and its mirrors.
		General HDLC layer for Linux is an interface between low-level hardware drivers for synchronous serial (HDLC) cards and the rest of kernel networking.
	www.kernel.org /pub/linux/utils/net/hdlc (1323 words)

	Internet Technical Resources: Cisco Discovery Protocol (CDP)
		CDP is assigned the Cisco HDLC protocol type value 0x2000.
		A Cisco-proprietary SNAP value enumerates HDLC protocol type values so CDP can run on all media that support SNAP, such as LAN media, Frame Relay, and ATM.
		The Cisco Discovery Protocol (CDP) periodically sends layer-2 "beacons" on each port of Ethernet and ATM switches, announcing port capabilities and names.
	www.cs.columbia.edu /~hgs/internet/cdp.shtml (156 words)

	High-Level Data Link Control - Wikipedia
		Darüber hinaus gibt es das proprietäre Cisco HDLC.
		Das HDLC Datenformat ist typisch für ein bitorientiertes Protokoll ohne die Möglichkeit der Authentifizierung.
		HDLC und Varianten finden Anwendung bei X.25, GSM, ISDN, Frame Relay und PPP.
	de.wikipedia.org /wiki/HDLC (430 words)

	ISDN DDR Using HDLC Encapsulation [Dial-on-Demand Routing (DDR)] - Cisco Systems
		In other words, no encapsulation is defined since HDLC is the default encapsulation used by Cisco IOS® Software.
		HDLC does not support any kind of authentication, hence the best protection here would be to verify the calling number with the isdn caller command on your interface.
		This method is known as Dynamic Multiple Encapsulations and is discussed in ISDN DDR using HDLC Encapsulation with Dynamic Multiple Encapsulations.
	www.cisco.com /en/US/tech/tk801/tk133/technologies_configuration_example09186a00800945be.shtml (2362 words)

	comp.dcom.sys.cisco Frequently Asked Questions (FAQ)
		You need to tell your cisco to use the same link-level protocol as the other router; by default, ciscos use a rather bare variant of HDLC (High-level Data Link Control) all link-level protocols use at some level/layer or another.
		Since this FAQ was first developed, cisco has written up a lot of useful information on their web site, http://www.cisco.com.
		People often ask about performance of the cisco routers and are shyed away from answering their questions because we don't know where to send them.
	www.faqs.org /faqs/cisco-networking-faq (8614 words)

	Emerging Technologies
		Connecting to a Cisco Router with HDLC Encapsulation
		The HDLC subsystem requires too much information to be properly configured at boot time, so you must run a utility (/usr/hdlc/utils/hdlccfg) which reads a configuration file and configures the board and HDLC subsystem.
		Please note that it is assumed that you are somewhat familiar with the HDLC protocol.
	www.etinc.com /bsdman.htm (6428 words)

	HDLC Over IP V35 Over Ethernet Frame Relay Over IP
		In fact, many other common layer 2 protocols are heavily based on HDLC, particularly the framing structure of HDLC: namely, PPP, Frame Relay, Cisco HDLC, SDLC, SS#7, AppleTalk, LAPB, and LAPD.
		WAN Protocols, such as PPP and Frame Relay, that utilize HDLC framing are encapsulated within IP packets for transport via Broadband IP services such as Wireless Ethernet, Metropolitan Area Networks, Gigagbit Ethernet, and IP satellite services.
		IPTubes with HDLCoIP connect to the leased line interface, V.35/RS530/T1/E1, of an Enterprise's WAN Router and encapsulate the HDLC frames into an IP Packet that is sent to the remote site IPTube where it is presented to the remote WAN router as the original HDLC frame.
	www.engagecom.com /News/IPTubeHDLCoIP_PR.htm (362 words)

	HDLC and other Bridge/Router Internetworking Protocols - BPDU cHDLC Cisco SRB ISL DRIP MAPOS RND SSP Wellfleet SRB Wellfleet BOFL
		DRiP is assigned the Cisco HDLC protocol type value 0x0102.
		The Cisco company produces communications equipment such as routers and bridges which use a proprietary protocol header (known as Cisco HDLC (cHDLC)) to transfer LAN protocols via WAN.
		The Protocol Code is usually Ethernet type codes; however, Cisco has added some codes to support packet types that do not appear in Ethernet.
	www.protocols.com /pbook/bridge.htm (1550 words)

	Everything Programming Cisco Cisco WAN Protocols - HDLC, PPP Cisco Configuring Frame Relay and ISDN Cisco Configuring X.25
		Everything Programming Cisco Cisco WAN Protocols- HDLC, PPP Cisco Configuring Frame Relay and ISDN Cisco Configuring X.25
		The first unit introduces the user to the various Wide Area Network (WAN) services such as Frame Relay, ISDN, and X.25.
		Keep pace with rapidly changing network and Internet technology with our series of courseware.
	www.discoveryvip.com /Courseware/Cisco_training/WAN_IPX_training.htm (524 words)

	CCNA 2.0: WAN Protocols - HDLC, PPP
		Finally, you will learn the commands for configuring and monitoring HDLC and PPP operations on a Cisco router.
		In the title WAN Protocols- HDLC and PPP, you will be introduced to two WAN technologies, HDLC and PPP.
		In addition, you will learn about the operations of a HDLC and PPP network.
	www.tutorials.com /catalog/catalog_item_n.asp?ugid=dHV0b3JpYWxz&pid=1421&csid=764 (81 words)

	libpcap.patch
		+ * + * This is for use when there is always such a header; the address field + * might be 0xff, for regular PPP, or it might be an address field for Cisco + * point-to-point with HDLC framing as per section 4.3.1 of RFC 1547 ("Cisco + * HDLC").
		We + * assume a 24-byte link-layer header, as appears in + * data frames in networks with no bridges.
		+ * + * XXX - same variable-length header problem; at least + * the Prism header is fixed-length.
	www.ackley.net /~jason/libpcap.patch (6287 words)

	Overview
		Cisco HDLC is a bit-oriented synchronous data-link layer protocol developed by the International Organization for Standardization (ISO).
		By default, synchronous serial lines use the HDLC serial encapsulation method, which provides the synchronous framing- and error-detection functions of HDLC without windowing or retransmission.
		It specifies a data encapsulation method on synchronous serial links using frame characters and checksums.
	www.juniper.net /techpubs/software/erx/junose60/swconfig-link/html/cisco-hdlc-config2.html (218 words)

	Configuring Transparent Bridging
		While bridge groups remain internal organizations of network interfaces functioning as distinct bridges within a router, transparent bridging on subinterfaces permits bridge groups to be used to multiplex different streams of bridged traffic on a LAN or HDLC serial interface.
		Provides fast-switched transparent bridging for the ATM interface on Cisco 7000 series routers, Cisco 4500, and Cisco 4000 series routers, according to the format specified in RFC 1483.
		Bridge groups cannot be used outside the router on which it is defined to identify traffic switched within the bridge group.
	www.cisco.com /univercd/cc/td/doc/product/software/ios122/122cgcr/fibm_c/bcfpart1/bcftb.htm (8688 words)

	Data link layer - Wikipedia, the free encyclopedia
		Other data link layer protocols, such as HDLC, are specified to include both sublayers, although some other protocols, such as Cisco HDLC, use HDLC's low-level framing as a MAC layer in combination with a different LLC layer.
		The data link layer provides the functional and procedural means to transfer data between network entities and might provide the means to detect and possibly correct errors that may occur in the Physical layer.
		This is the layer which transfers data between adjacent network nodes in a wide area network or between nodes on the same local area network segment.
	en.wikipedia.org /wiki/Data_link_layer (701 words)

	High Level Data Link Control (HDLC)
		HDLC is the default serial link protocol for Cisco routers.
		High-level Data Link Control (HDLC) is an enhanced derivative of SDLC from IBM.
		Nearly all other routers on the market use PPP for link control.
	www.inetdaemon.com /tutorials/wan/hdlc (58 words)

	Cisco - Configuring and Troubleshooting Frame Relay
		Frame Relay is an industry-standard, switched data link layer protocol that handles multiple virtual circuits using High-Level Data Link Control (HDLC) encapsulation between connected devices.
		Frame Relay provides a packet-switching data communications capability that is used across the interface between user devices (such as routers, bridges, host machines) and network equipment (such as switching nodes).
		This occurs because Frame Relay Inverse ARP is on by default for multipoint interfaces.
	www.cisco.com /warp/public/125/12.html (58 words)

	Cisco - Configuring and Troubleshooting Frame Relay
		Frame Relay is an industry-standard, switched data link layer protocol that handles multiple virtual circuits using High-Level Data Link Control (HDLC) encapsulation between connected devices.
		IP split horizon checking is disabled by default for Frame Relay encapsulation, so routing updates come in and out the same interface.
		Frame Relay provides a packet-switching data communications capability that is used across the interface between user devices (such as routers, bridges, host machines) and network equipment (such as switching nodes).
	www.cisco.com /warp/public/125/12.html (58 words)

	HDLC and other Bridge/Router Internetworking Protocols - BPDU cHDLC Cisco SRB ISL DRIP MAPOS RND SSP Wellfleet SRB Wellfleet BOFL
		HDLC and other Bridge/Router Internetworking Protocols - BPDU
		Bridge Protocol Data Unit (BPDU) is the IEEE 802.1d MAC Bridge Management protocol which is the standard implementation of STP (Spanning Tree Protocol).
		Using one bridge configured as root for reference, the BPDU switches one of two bridges forming a network loop into standby mode, so that only one side of a potential loop passes traffic.
	www.protocols.com /pbook/bridge.htm (58 words)

	Define the CCC Encapsulation for Layer 2 Switching Cross-Connects
		For PPP or Cisco HDLC circuits, specify the encapsulation in the
		To configure Layer 2 switching cross-connects, configure the CCC encapsulation on the router that is acting as the switch (Router B in Figure 20).
		For Ethernet circuits, specify the encapsulation in the
	www.juniper.net /techpubs/software/junos/junos53/swconfig53-mpls-apps/html/ccc-config3.html (187 words)

	Troubleshooting DLSw: Ethernet and Qualified Logical Link Control [IBM Networking] - Cisco Systems
		Logical Link Control (LLC) is a subset of High-Level Data Link Control (HDLC).
		This document explains how to implement Qualified Logical Link Control (QLLC) in Cisco routers and message flows, for a call connection in a topology where a front-end processor (FEP) is connected through Ethernet and where remote devices (either physical unit [PU] type 2.0 or PU type 2.1) are connected to the X.25 network.
		A dumb PU 2.0 is coaxially attached to an IBM 3174 Establishment Controller.
	www.cisco.com /en/US/tech/tk331/tk336/technologies_tech_note09186a00800a6935.shtml (3473 words)

	L2TPv3: Layer-2 Tunnel Protocol Version 3 [Cisco IOS Software Releases 12.3 T] - Cisco Systems
		L2TPv3 encapsulates an HDLC frame arriving at a PE in its entirety (including the Address, Control, and Protocol fields, but not the Flag fields and the frame check sequence) with an L2TP data header.
		This more robust version of L2TPv3 is now available in Cisco IOS Release 12.3(2)T. As described in the section " L2TPv3 Header Description," the UTI data header is identical to the L2TPv3 header but with no sequence numbers and an 8-byte cookie.
		L2TPv3 defines the base L2TP protocol as being separate from the Layer 2 payload that is tunneled.
	www.cisco.com /en/US/products/sw/iosswrel/ps5207/products_feature_guide09186a00801a756b.html (3473 words)

	HDLC Back-to-Back Connections [High-Level Data Link Control (HDLC)] - Cisco Systems
		The default serial encapsulation on Cisco routers is Cisco HDLC, so it does not need to be explicitly configured on the router.
		You can use it to verify that your connections and hardware are working properly.
		As a result, the encapsulation type is not displayed in the configuration.
	www.cisco.com /en/US/tech/tk713/tk317/technologies_configuration_example09186a00800944ff.shtml (540 words)

	Alliance Semiconductor --- Networking
		The AS95L2100 family incorporates the resilient ring Media Access Control (MAC) along with layer 1 and layer 2 functions that include: SONET framers, Ethernet MACs, POS/HDLC, GFP and WIS frame delineators.
		This technology provides an unparalleled control over hardware and software that enable the same device to be adapted - without performance penalty - to various ring protocols such as the emerging IEEE 802.17 draft 3.x, Cisco's SRP and other proprietary protocols.
		The AS95L2100 family of Resilient Packet Ring Controllers is specially designed to support the emerging IEEE 802.17 Resilient Packet Ring (RPR) standard at various line interface speeds including OC-12, OC-48 and OC-192 for SONET, and 2.5G & 10G for Ethernet and PacketPHY.
	www.alsc.com /products/networking.htm (382 words)

	OC-192c Packet Over SONET/SDH Load Module
		Point-to-Point Protocol (PPP) over SONET/SDH as per RFC 2615, Cisco HDLC, Frame Relay, and User-Defined Header
		The advanced stream scheduler programs the streams to transmit packets in such a manner that satisfies the aggregate rate by scheduling a set of packets to be transmitted from each stream, thus creating a transmission pattern with a mixture of packets with variable rates.
		After all packets in the first stream are transmitted, control is passed to the next defined stream in the sequence.
	www.ixiacom.com /products/interfaces/in_display.php?skey=in_oc192c (947 words)

	Cisco - Configuring and Troubleshooting Frame Relay
		Frame Relay is an industry-standard, switched data link layer protocol that handles multiple virtual circuits using High-Level Data Link Control (HDLC) encapsulation between connected devices.
		Frame Relay provides a packet-switching data communications capability that is used across the interface between user devices (such as routers, bridges, host machines) and network equipment (such as switching nodes).
		This occurs because Frame Relay Inverse ARP is on by default for multipoint interfaces.
	www.cisco.com /warp/public/125/12.html (947 words)

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Topic: Cisco HDLC

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In the News (Sat 26 Dec 09)