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Topology broadcast based on reverse-path forwarding (TBRPF) is a link-state routing protocol for wireless mesh networks. The obvious design for a wireless link-state protocol (such as the optimized link-state routing protocol) transmits large amounts of routing data, and this limits the utility of a link-state protocol when the network is made of moving nodes.
The thought being that traffic is denied if it fails the RPF check and is therefore filtered. While uRPF is used as an ingress filtering mechanism, it is affected by reverse-path forwarding. Reverse path filters are typically used to disable asymmetric routing where an IP application has a different incoming and outgoing routing path.
Download as PDF; Printable version; In other projects ... Order One Network Protocol; S. ... Topology dissemination based on reverse-path forwarding; V.
PIM is not dependent on a specific unicast routing protocol; it can make use of any unicast routing protocol in use on the network. PIM does not build its own routing tables. PIM uses the unicast routing table for reverse-path forwarding. [1]: 56–57 There are four variants of PIM:
Controlled flooding has its own two algorithms to make it reliable, SNCF (Sequence Number Controlled Flooding) and RPF (reverse-path forwarding). In SNCF, the node attaches its own address and sequence number to the packet, since every node has a memory of addresses and sequence numbers.
A reverse-path forwarding check and other checks are performed on multi-destination frames to further control potentially looping traffic. The first RBridge that a unicast frame encounters in a campus, RB1, encapsulates the received frame with a TRILL header that specifies the last RBridge, RB2, where the frame is decapsulated.
Features such as pfsync and CARP for failover and redundancy, authpf for session authentication, and ftp-proxy to ease firewalling the difficult FTP protocol, have also extended PF. Also PF supports SMP (Symmetric multiprocessing) & STO (Stateful Tracking Options). One of the many innovative features is PF's logging.
Historically, all mail transfer agents (MTAs) added their host name to the reverse path. In the Simple Mail Transfer Protocol (SMTP) this reverse path is also known as MAIL FROM, but paths were also used before and outside of SMTP, e.g. as bang paths in UUCP and Usenet (Net-News). All news articles still contain a Path header, example: