Overview

Fast Path GRE provides IPvX and Ethernet over GRE support in the fast path.

Features

• Supported features:
  • IPv4 over IPv4 GRE tunnelling (L3 tunnel)
  • IPv6 over IPv4 GRE tunnelling (L3 tunnel)
  • IPv6 over IPv6 GRE tunnelling (L3 tunnel)
  • IPv4 over IPv6 GRE tunnelling (L3 tunnel)
  • IPV4 over Ether GRE tunnelling (L2 tunnel)
  • IPV6 over Ether GRE tunnelling (L2 tunnel)
• Ethernet GRE can be encapsulated on IPv4 (gretap) or IPv6 (ip6gretap)
• Cross-VRF processing (the encapsulated and plaintext traffic may be in different VRFs, the GRE interface performs the VRF transition).

Dependencies

6WINDGate modules

• Fast Path Baseline
• Fast Path Forwarding IPv4
• Fast Path Forwarding IPv6

Linux

• Full Linux synchronization is a kernel patch (upstream 2.6.28).

  http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c19e654ddbe3

• Support of Ether GRE (L2 tunnelling) is a kernel patch (upstream 2.6.28).

  http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e1a8000228e1

• GRE over IPv6 support is a kernel patch (upstream v3.7).

  http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c12b395a4664

• Cross-VRF support for IPv4 GRE is a kernel patch (upstream v3.16).

  http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b57708add314

• Cross-VRF support for IPv6 GRE is a kernel patch (upstream v3.16).

  http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=22f08069e8b4