Using the FRRouting Snap
===============================

After installing the Snap, the priviledged plug need to be connected:

    snap connect frr:network-control core:network-control

Enabling/Disabling FRRouting Daemons
-------------------------------------------

By default (at this time), all FRRouting daemons will be enabled
on installation. If you want to disable a specific daemon, then use 
the systemctl commands

ie for `ospf6d` (OSPFv3):

    systemctl disable snap.frr.ospf6d.service
    systemctl enable snap.frr.ospf6d.service

The daemons are: `ripd`, `ripngd`, `ospfd`, `ospf6d`, `isisd`, `bgpd`, 
`pimd`, `ldpd`, `eigrpd`, `babeld`, `nhrpd`, `bfdd`, `zebra`

Commands defined by this snap
-----------------------------

- `frr.vtysh`:
	FRRouting VTY Shell (configuration tool)
- `frr.version`:
	Returns output of `zebra --version` to display version and configured 
	options
- `frr.readme`:
	Returns this document `cat README_usage.md`
- `frr.set`:
	Allows to enable `FPM` and/or disable RPKIi module. See Module section below

and for debugging defined at this time (May get removed later - do not 
depend on them). These are mainly intended to debug the Snap

- `frr.zebra-debug`:
	Starts zebra daemon in foreground
- `frr.ripd-debug`:
	Starts ripd daemon in foreground
- `frr.ripngd-debug`:
	Starts ripng daemon in foreground
- `frr.ospfd-debug`:
	Starts ospfd daemon in foreground
- `frr.ospf6d-debug`:
	Starts ospf6d daemon in foreground
- `frr.isisd-debug`:
	Starts isisd daemon in foreground
- `frr.bgpd-debug`:
	Starts bgpd daemon in foreground
- `frr.pimd-debug`:
	Starts pimd daemon in foreground
- `frr.ldpd-debug`:
        Starts ldpd daemon in foreground
- `frr.nhrpd-debug`:
        Starts nhrpd daemon in foreground
- `frr.babeld-debug`:
        Starts babeld daemon in foreground
- `frr.eigrpd-debug`:
        Starts eigrpd daemon in foreground
- `frr.pbrd-debug`:
        Starts pbrd daemon in foreground
- `frr.staticd-debug`:
        Starts staticd daemon in foreground
- `frr.bfdd-debug`:
        Starts bfdd daemon in foreground
- `frr.fabricd-debug`:
        Starts fabricd daemon in foreground

MPLS (LDP)
----------
The MPLS forwarding requires a Linux Kernel version 4.5 or newer and
specific MPLS kernel modules loaded. It will be auto-detected by
FRR. You can check the detected setup with the `show mpls status`
command from within `frr.vtysh`

The following kernel modules `mpls-router` and `mpls-iptunnel`
need to be loaded. On Ubuntu 16.04, this can be done by editing 
'/etc/modules-load.d/modules.conf' and add the following lines:

	# Load MPLS Kernel Modules
	mpls-router
	mpls-iptunnel

For other distributions, please check the documentation on loading
modules. You need to either reboot or use `modprobe` to manually load
the modules as well before MPLS will be available.

In addition to this, the MPLS Label-Processing needs to be enabled
with `sysctl` on the required interfaces. Assuming the interfaces
are named `eth0`, `eth1` and `eth2`, then the additional lines in
`/etc/sysctl.conf` will enable it on a Ubuntu 16.04 system:

	# Enable MPLS Label processing on all interfaces
	net.mpls.conf.eth0.input=1
	net.mpls.conf.eth1.input=1
	net.mpls.conf.eth2.input=1
	net.mpls.platform_labels=100000

These settings require either a reboot or a manual configuration with
`sysctl` as well.

Modules
----------
The `frr.set` allows to turn FPM module ond the RPKI module on or off.

    frr.set fpm {disable|protobuf|netlink}
    
    Disables FPM or enables FPM with selected mode (default: disabled)

By default, the FPM module is disabled, but installed with netlink and
protobuf support. To enable the FPM module, use the `frr.set fpm protobuf`
or `frr.set fpm netlink` command. The command will only enable the mode
for the next restart of zebra. Please reboot or restart zebra after
changing the mode to become effective.

    frr.set rpki {enable|disable}
   
    Disables or enables BGP RPKI (default: enabled)

By default, the RPKI module is enabled. To disable the RPKI module
use the `frr.set rpki disable` command. The command will only enable
the module after the next restart of the bgp daemon. Please reboot or 
restart bgpd after changing the mode to become effective.
(Normally, there is no need to disable the module as it has no effect
if there are no RPKI configurations in BGP)

FAQ
---
- frr.vtysh displays `--MORE--` on long output. How to suppress this?
    - Define `VTYSH_PAGER` to `cat` (default is `more`). (Ie add 
      `export VTYSH_PAGER=cat` to the end of your `.profile`)

- bfdd / ospfd / ospf6d / nhrpd are not running after installation
    - Installing a new snap starts the daemons, but at this time they
      may not have the required privileged access. Make sure you 
      issue the `snap connect` command as given above (can be verified
      with `snap interfaces`) and **THEN** restart the daemons (or
      reboot the system). 
      This is a limitation of any snap package at this time which
      requires privileged interfaces (ie to manipulate routing tables)

- Can I run vtysh directly without the "frr." prefix?
    - Yes, enable the vtysh alias in the frr snap package by:
      sudo snap alias frr vtysh
	
Sourcecode available
====================

The source for this SNAP is available as part of the FRRouting
Source Code Distribution under `GPLv2 or later`

<https://github.com/frrouting/frr.git>

Instructions for rebuilding the snap are in `snapcraft/README.snap_build.md`

*Please checkout the desired branch before following the instructions
as they may have changed between versions of FRR*

Official Webpage for FRR
========================

Official webpage for FRR is at <https://www.frrouting.org/>

Feedback welcome
================

Please send Feedback about this snap to Martin Winter at 
`mwinter@opensourcerouting.org`
