Frame Relay

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Frame header fields (2) Fields for congestion avoidance and resolution • FECN – Forward Explicit Congestion Notification • BECN – Backward Explicit Congestion Notification • DE – Discard Eligibility © 2005 Petr Grygarek, Advanced Computer Networks Technologies 18
Multiprotocol encapsulation Frame header does not carry layer 3 protocol ID • FRF.3/RFC 1490 - Multiprotocol Interconnect over Frame Relay • L3 protocol given by NLPID NLPID (Network Layer Protocol ID) • 2 bytes just behind frame header • NLPID values defined in ISO/IEC TR 9577 • NLPID may indicate usage of SNAP header • Earlier proprietary L3 protocol ID identification Can vary on different VCs © 2005 Petr Grygarek, Advanced Computer Networks Technologies 19
Page 1 and 2: Frame Relay Petr Grygárek rek © 2
Page 3 and 4: Infrastructure and DTEs Most-common
Page 5 and 6: VC Principle FR Switch I 1 I 2 I 1
Page 7 and 8: Virtual circuit configuration (FR s
Page 9 and 10: Virtual circuit advantages • Requ
Page 11 and 12: Local access loop •Subscriber con
Page 13 and 14: Frame Relay Standardization Bodies
Page 15 and 16: User-to-Network Interface (UNI) ©
Page 17: Frame header fields (1) • DLCI -
Page 21 and 22: Local Management Interface (LMI) ©
Page 23 and 24: LMI frame • Carried in normal FR
Page 25 and 26: Congestion avoidance and recovery
Page 27 and 28: Congestion recovery implementation
Page 29 and 30: FR virtual circuit QoS parameters P
Page 31 and 32: Traffic policing and traffic shapin
Page 33 and 34: Traffic shaping /rate limiting •
Page 35 and 36: Leaky bucket Algorithm Provides a m
Page 37 and 38: Token Bucket Implementation • FR
Page 39 and 40: TCP/IP over Frame Relay © 2005 Pet
Page 41 and 42: Typical Frame Relay usage topologie
Page 43 and 44: Relationship between IP subnets and
Page 45 and 46: Frame Relay (sub)interface types
Page 47 and 48: Inverse ARP (INARP) INARP allows au
Page 49 and 50: DV routing updates problems • Dis
Page 51 and 52: OSPF • Frame-relay cloud represen
Page 53 and 54: FR multicast support • All multic

Frame Relay

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