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"""Module for working with EOS VRF resources
The Vrfs resource provides configuration of VRF resources for an EOS
node.
Parameters:
name (string): The name parameter maps to the VRF name in EOS. Valid
values include any consecutive sequence of numbers, letters and
underscore up to the maximum number of characters. This parameter
is defaultable.
description (string): The vrf description set by the user
ipv4_routing (bool): Tells whether IPv4 routing is enabled on the VRF
ipv6_routing (bool): Tells whether IPv6 unicast routing is enabled on the
VRF
"""
import re
from pyeapi.api import EntityCollection
from pyeapi.utils import make_iterable
RD_RE = re.compile(r'(?:\srd\s)(?P<value>.*)$', re.M)
DESCRIPTION_RE = re.compile(r'(?:description\s)(?P<value>.*)$', re.M)
class Vrfs(EntityCollection):
"""The Vrfs class provides a configuration resource for VRFs
The Vrfs class is derived from ResourceBase a standard set of methods
for working with VRF configurations on an EOS node.
"""
def get(self, value):
"""Returns the VRF configuration as a resource dict.
Args:
value (string): The vrf name to retrieve from the
running configuration.
Returns:
A Python dict object containing the VRF attributes as
key/value pairs.
"""
if self.version_number >= '4.23':
config = self.get_block('vrf instance %s' % value)
else:
config = self.get_block('vrf definition %s' % value)
if not config:
return None
response = dict(vrf_name=value)
response.update(self._parse_rd(config))
response.update(self._parse_description(config))
config = self.get_block('no ip routing vrf %s' % value)
if config:
response['ipv4_routing'] = False
else:
response['ipv4_routing'] = True
config = self.get_block('no ipv6 unicast-routing vrf %s' % value)
if config:
response['ipv6_routing'] = False
else:
response['ipv6_routing'] = True
return response
def _parse_rd(self, config):
""" _parse_rd scans the provided configuration block and extracts
the vrf rd. The return dict is intended to be merged into the response
dict.
Args:
config (str): The vrf configuration block from the nodes running
configuration
Returns:
dict: resource dict attribute
"""
match = RD_RE.search(config)
if match:
value = match.group('value')
else:
value = match
return dict(rd=value)
def _parse_description(self, config):
""" _parse_description scans the provided configuration block and
extracts the vrf description value. The return dict is intended to
be merged into the response dict.
Args:
config (str): The vrf configuration block from the nodes
running configuration
Returns:
dict: resource dict attribute
"""
value = DESCRIPTION_RE.search(config).group('value')
return dict(description=value)
def getall(self):
"""Returns a dict object of all VRFs in the running-config
Returns:
A dict object of VRF attributes
"""
if self.version_number >= '4.23':
vrfs_re = re.compile(r'(?<=^vrf instance\s)(\w+)', re.M)
else:
vrfs_re = re.compile(r'(?<=^vrf definition\s)(\w+)', re.M)
response = dict()
for vrf in vrfs_re.findall(self.config):
response[vrf] = self.get(vrf)
return response
def create(self, vrf_name, rd=None):
""" Creates a new VRF resource
Note: A valid RD has the following format admin_ID:local_assignment.
The admin_ID can be an AS number or globally assigned IPv4 address.
The local_assignment can be an integer between 0-65,535 if the
admin_ID is an IPv4 address and can be between 0-4,294,967,295 if
the admin_ID is an AS number. If the admin_ID is an AS number the
local_assignment could also be in the form of an IPv4 address.
Args:
vrf_name (str): The VRF name to create
rd (str): The value to configure the vrf rd
Returns:
True if create was successful otherwise False
"""
if self.version_number >= '4.23':
commands = ['vrf instance %s' % vrf_name]
else:
commands = ['vrf definition %s' % vrf_name]
if rd:
commands.append('rd %s' % rd)
return self.configure(commands)
def delete(self, vrf_name):
""" Deletes a VRF from the running configuration
Args:
vrf_name (str): The VRF name to delete
Returns:
True if the operation was successful otherwise False
"""
if self.version_number >= '4.23':
command = 'no vrf instance %s' % vrf_name
else:
command = 'no vrf definition %s' % vrf_name
return self.configure(command)
def default(self, vrf_name):
""" Defaults the VRF configuration for given name
Args:
vrf_name (str): The VRF name to default
Returns:
True if the operation was successful otherwise False
"""
if self.version_number >= '4.23':
command = 'default vrf instance %s' % vrf_name
else:
command = 'default vrf definition %s' % vrf_name
return self.configure(command)
def configure_vrf(self, vrf_name, commands):
""" Configures the specified VRF using commands
Args:
vrf_name (str): The VRF name to configure
commands: The list of commands to configure
Returns:
True if the commands completed successfully
"""
commands = make_iterable(commands)
if self.version_number >= '4.23':
commands.insert(0, 'vrf instance %s' % vrf_name)
else:
commands.insert(0, 'vrf definition %s' % vrf_name)
return self.configure(commands)
def set_rd(self, vrf_name, rd):
""" Configures the VRF rd (route distinguisher)
Note: A valid RD has the following format admin_ID:local_assignment.
The admin_ID can be an AS number or globally assigned IPv4 address.
The local_assignment can be an integer between 0-65,535 if the
admin_ID is an IPv4 address and can be between 0-4,294,967,295 if
the admin_ID is an AS number. If the admin_ID is an AS number the
local_assignment could also be in the form of an IPv4 address.
Args:
vrf_name (str): The VRF name to set rd for
rd (str): The value to configure the vrf rd
Returns:
True if the operation was successful otherwise False
"""
cmds = self.command_builder('rd', value=rd)
return self.configure_vrf(vrf_name, cmds)
def set_description(self, vrf_name, description=None, default=False,
disable=False):
""" Configures the VRF description
Args:
vrf_name (str): The VRF name to configure
description(str): The string to set the vrf description to
default (bool): Configures the vrf description to its default value
disable (bool): Negates the vrf description
Returns:
True if the operation was successful otherwise False
"""
cmds = self.command_builder('description', value=description,
default=default, disable=disable)
return self.configure_vrf(vrf_name, cmds)
def set_ipv4_routing(self, vrf_name, default=False, disable=False):
""" Configures ipv4 routing for the vrf
Args:
vrf_name (str): The VRF name to configure
default (bool): Configures ipv4 routing for the vrf value to
default if this value is true
disable (bool): Negates the ipv4 routing for the vrf if set to true
Returns:
True if the operation was successful otherwise False
"""
cmd = 'ip routing vrf %s' % vrf_name
if default:
cmd = 'default %s' % cmd
elif disable:
cmd = 'no %s' % cmd
cmd = make_iterable(cmd)
return self.configure(cmd)
def set_ipv6_routing(self, vrf_name, default=False, disable=False):
""" Configures ipv6 unicast routing for the vrf
Args:
vrf_name (str): The VRF name to configure
default (bool): Configures ipv6 unicast routing for the vrf value
to default if this value is true
disable (bool): Negates the ipv6 unicast routing for the vrf if set
to true
Returns:
True if the operation was successful otherwise False
"""
cmd = 'ipv6 unicast-routing vrf %s' % vrf_name
if default:
cmd = 'default %s' % cmd
elif disable:
cmd = 'no %s' % cmd
cmd = make_iterable(cmd)
return self.configure(cmd)
def set_interface(self, vrf_name, interface, default=False, disable=False):
""" Adds a VRF to an interface
Notes:
Requires interface to be in routed mode. Must apply ip address
after VRF has been applied. This feature can also be accessed
through the interfaces api.
Args:
vrf_name (str): The VRF name to configure
interface (str): The interface to add the VRF too
default (bool): Set interface VRF forwarding to default
disable (bool): Negate interface VRF forwarding
Returns:
True if the operation was successful otherwise False
"""
cmds = ['interface %s' % interface]
if self.version_number >= '4.23':
cmds.append(self.command_builder('vrf', value=vrf_name,
default=default, disable=disable))
else:
cmds.append(self.command_builder('vrf forwarding', value=vrf_name,
default=default, disable=disable))
return self.configure(cmds)
def instance(node):
"""Returns an instance of Vrfs
This method will create and return an instance of the Vrfs object passing
the value of API to the object. The instance method is required for the
resource to be autoloaded by the Node object
Args:
node (Node): The node argument passes an instance of Node to the
resource
"""
return Vrfs(node)
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