draft-haas-bfd-large-packets

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Presentation transcript:

draft-haas-bfd-large-packets Jeff Haas (jhaas@juniper.net) Albert Fu (afu14@bloomberg.net) IETF Montreal 18th July 2018

Motivation MTU issue may occur without any indication of link/protocol issue, as protocol hello/keepalive packets are small In redundant topology, troubleshooting MTU issue is time consuming due to multiple ECMP paths e.g. Traffic between two end points may have more than 16 ECMP paths in typical Core/Distribution/Access design Current network typically involves multiple routing protocols (e.g. OSPF, ISIS, BGP, MPLS etc.) Only ISIS has automatic MTU detection mechanism Routing protocol hellos are handled by control plane, hence unable to use sub-second timer for fast detection An automatic and fast mechanism for detection of MTU issue is highly desirable in high performance network.

Why use BFD for MTU detection? Routing protocols (e.g. OSPF/ISIS/BGP) on modern high performance routers all support using “light-weight” BFD for faster failure detection BFD function may be supported on distributed hardware and independent of control plane Enable fast sub-second failure detection Best practice routing protocol design leverages BFD BFD failure detection (due to connectivity or MTU) will bring client routing protocols down, providing fast automatic traffic diversion Alarm for BFD failure will enable immediate problem detection and follow up

bfd.PaddedPduSize Current Proposal Sample User Cases Max IP Payload IP Hdr UDP Hdr BFD ip len x udp src port udp dst 3784 udp len 32 chksum layer2 bfd ver bfd len 24 My Disc Your Disc Min TX Min RX Min Echo 52 8 24 udp len=32 ip len=52 Proposal IP Hdr UDP Hdr BFD ip len x udp src port udp dst 3784 udp len 32 chksum layer2 bfd ver bfd len 24 My Disc Your Disc Min TX Min RX Min Echo Padded with 0x00 52+p 8 24 p=bfd.PaddedPduSize udp len=32 ip len=52+ bfd.PaddedPduSize Sample User Cases Max IP Payload Bfd.PaddedPduSize (p) Internet Core 1,500 1,448 (1,500-52) MPLS VPN Core (up to 3 labels) 1,460 (1,512-52)

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