FRAME MODE MPLS                                                                                                packetlife....
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Frame mode mpls

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Transcript of "Frame mode mpls"

  1. 1. FRAME MODE MPLS packetlife.net Protocol Header Conceptual Components 8 16 24 32 Control Plane Label TC S TTL Facilitates label exchange between neighboring LSRs using LDP or TDP (includes the LIB) Forwarding/Data Plane L2 IP Forwards packets based on label or destination IP address (includes the FIB and LFIB) Label stack Label ProtocolsLabel (20 bits) Unique label value LDP TDPTraffic Class (3 bits) CoS-mapped QoS marking Hello Address 224.0.0.2 255.255.255.255Bottom of Stack (1 bit) Indicates label is last in the stack Hello Port UDP/646 UDP/711Time To Live (8 bits) Hop counter mapped from IP TTL Adjacency Port TCP/646 TCP/711 Label Switched Path Proprietary No Cisco Terminology Provider Network Label Distribution Protocol (LDP) PE P PE Standards-based label distribution protocol P defined in RFC 3036 P Tag Distribution Protocol (TDP) Ciscos proprietary predecessor to LDP LSP Label Switching Router (LSR) Any router performing label switching (MPLS) Customer Network Label-Switched Path (LSP) The unidirectional path through one or more LSRs taken by a label-switched packet belonging to an FEC CE C C CE Forwarding Equivalence Class (FEC) A group of packets which are forwarded in anCustomer (C) IP-only routers internal to customer network identical manner, typically by destination prefixCustomer Edge (CE) C routers which face PE routers and/or traffic class Label Information Base (LIB)Provider Edge (PE) LSRs on the MPLS-IP boundary Contains all labels learned by an LSR via a labelProvider (P) MPLS-only LSRs in provider network distribution protocol MPLS Configuration Forwarding Information Base (FIB) Routing database for unlabeled (IP) packets! Enable CEF Label FIB (LFIB)ip cef Routing database for labeled (MPLS) packets! Select label protocol Interim Packet Propagationmpls label protocol ldp An LSR temporarily falls back to IP routing while waiting to learn the necessary MPLS! Enable MPLS on IP interfaces label(s)interface FastEthernet0/0 ip address 10.0.0.1 255.255.255.252 Penultimate Hop Popping (PHP) mpls ip The second-to-last LSR in an LSP removes the ! Raise MPLS MTU to accommodate multilabel stack MPLS label so the last LSR only has to perform mpls mtu 1512 an IP lookup Troubleshootingshow mpls interfaces show mpls ldp bindings [detail] (LIB) show ip cef [detail] (FIB)show mpls ldp neighbors show mpls forwarding-table [detail] (LFIB) debug mpls […]by Jeremy Stretch v2.0

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