Overview

Fast Path Forwarding IPv4 provides IPv4 forwarding in the fast path.

Features

• IP forwarding
• IP fragmentation
• ECMP (Equal Multipath) with priority per route type
• VRF support
• IPv4 reverse path forwarding check
• TCPmss clamping per interface
• Next hop marking (if fast path filter module is present)
• Routes to same destination with different metrics

Dependencies

6WINDGate modules

• Fast Path Baseline

Linux

• Synchronization of interface flag status forwarding is a kernel patch (upstream 3.8).

  Without this patch, the fast path starts with forwarding enabled.

  http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=edc9e748934c

• RPF: Synchronization of interface flag rp_filter is a kernel patch (upstream 3.8).

  Without this patch, RPF must be configured manually via fp-cli.

  http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cc535dfb6a85

• Optimization of synchronization of ARP entries is a kernel patch (upstream 3.13).

  Without this patch, the ARP entries stand in state STALE and the fast path continuously sends hitflags for them.

  http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=53385d2d1de84f4036a0919ec46964c4e81b83f5