BGP4R¶ ↑

Description¶ ↑

BGP4R is a ruby library which enables the creation and manipulation of BGP messages. In BGP4R, all well-known BGP constructs are defined in classes.

Using BGP4R, the process of building BGP messages becomes a simple matter of adding objects to their respective containers; i.e. an attribute is added to a Path_attribute container, while a Path_attribute object or Nlri object is added to an Update object.

A Neighbor class is used to describe a BGP peering adjacency.¶ ↑

A Neighbor instance can be started, stopped, and programmed to send BGP messages¶ ↑

Neighbor#start
Neighbor#stop
Neighbor#send_message

Neighbor capabilities such as MBGP or 4-byte AS can be set using Neighbor#capability¶ ↑

e.g.: 

 neighbor = Neighbor.new \
    :version=> 4, 
    :my_as=> 100, 
    :remote_addr => '192.168.1.200', 
    :id=> '1.1.1.1', 
    :holdtime=> 20

 neighbor.capability_mbgp_ipv4_unicast  
 neighbor.capability_mbgp_ipv4_multicast
 neighbor.capability_mbgp_ipv4_mpls_vpn_unicast
 neighbor.capability_mbgp_ipv6_mpls_vpn_multicast
 neighbor.capability_mbgp_nsap_mpls_vpn_unicast
 neighbor.capability_mbgp_nsap_unicast  
 neighbor.capability_route_refresh
 neighbor.capability_route_refresh 128  
 neighbor.capability_four_byte_as

Ruby classes representing BGP messages, attributes, and nlri¶ ↑

Messages:¶ ↑

Open
Update
Notification
Keepalive
Route_refresh

Attributes:¶ ↑

Origin
As_path
Next_hop
Local_pref
Multi_exit_disc
Communities
Atomic_aggregate
Aggregator
Originator_id
Cluster_list
Mp_reach
Mp_unreach
As4_path
As4_aggregator
Extended_communities

Update containers:¶ ↑

Nlri
Path_attribute
Withdrawn

Getting started¶ ↑

Here is an example illustrating how to use this API:¶ ↑

require 'bgp4r'
include BGP

Start loggin¶ ↑

Log.create
Log.level=Logger::DEBUG

Create a Neighbor:¶ ↑

neighbor = Neighbor.new \
  :version=> 4, 
  :my_as=> 100, 
  :remote_addr => '192.168.1.200', 
  :id=> '1.1.1.1', :holdtime=> 20

Set its capabilities:¶ ↑

neighbor.capability_mbgp_ipv4_unicast  
neighbor.capability_mbgp_ipv4_multicast
neighbor.capability_mbgp_ipv4_mpls_vpn_unicast
neighbor.capability_mbgp_ipv6_mpls_vpn_multicast
neighbor.capability_mbgp_nsap_mpls_vpn_unicast
neighbor.capability_mbgp_nsap_unicast  
neighbor.capability_route_refresh
neighbor.capability_route_refresh 128  
neighbor.capability_four_byte_as

Start peering:¶ ↑

neighbor.start :auto_retry=> true

Build an BGP Update object made up of a Path_attribute and a Nlri objects:¶ ↑

an_update = Update.new(
  Path_attribute.new(
    Origin.new(2),
    Next_hop.new('192.168.1.5'),
    Multi_exit_disc.new(100),
    Local_pref.new(100),
    As_path.new(400,300,200),
    Communities.new('1311:1 311:59 2805:64')
  ),
  Nlri.new('77.0.0.0/17', '78.0.0.0/18', '79.0.0.0/19')
)

Ship it!¶ ↑

neighbor.send_message an_update

Produces:¶ ↑

Jean-Michel-Esnaults-MacBook-Pro-17:bgp4r jme$ ruby bgp
I, [56:08#28463]  INFO -- : Open Socket old state Idle new state Active
I, [56:08#28463]  INFO -- : SendOpen
D, [56:08#28463] DEBUG -- : Send Open Message (1), length: 61
  Version 4, my AS 100, Holdtime 20s, ID 1.1.1.1
  Capability(65): 4-octet AS number: 100
  Option Capabilities Advertisement (2): [02020200]
    Route Refresh (2), length: 2
  Option Capabilities Advertisement (2): [02028000]
    Route Refresh (Cisco) (128), length: 2
  Option Capabilities Advertisement (2): [0206010400010001]
    Multiprotocol Extensions (1), length: 4
      AFI IPv4 (1), SAFI Unicast (1)
  Option Capabilities Advertisement (2): [0206010400010002]
    Multiprotocol Extensions (1), length: 4
      AFI IPv4 (1), SAFI Multicast (2)

0x0000: ffff ffff ffff ffff ffff ffff ffff ffff
0x0001: 003d 0104 0064 0014 0101 0101 2002 0641
0x0002: 0400 0000 6402 0202 0002 0280 0002 0601
0x0003: 0400 0100 0102 0601 0400 0100

D, [56:08#28463] DEBUG -- : #<BGP::IO::Input:0x40ab50> #<Thread:0x40a7b8> started
D, [56:08#28463] DEBUG -- : #<BGP::IO::Output:0x40ab14> #<Thread:0x40a754> started
I, [56:08#28463]  INFO -- : ev_send_open old state Active new state OpenSent
I, [56:08#28463]  INFO -- : RecvOpen
D, [56:08#28463] DEBUG -- : Recv Open Message (1), length: 61
  Version 4, my AS 100, Holdtime 180s, ID 2.2.2.2
  Option Capabilities Advertisement (2): [0206010400010001]
    Multiprotocol Extensions (1), length: 4
      AFI IPv4 (1), SAFI Unicast (1)
  Option Capabilities Advertisement (2): [0206010400010002]
    Multiprotocol Extensions (1), length: 4
      AFI IPv4 (1), SAFI Multicast (2)
  Option Capabilities Advertisement (2): [02028000]
    Route Refresh (Cisco) (128), length: 2
  Option Capabilities Advertisement (2): [02020200]
    Route Refresh (2), length: 2
  Capability(65): 4-octet AS number: 100

0x0000: ffff ffff ffff ffff ffff ffff ffff ffff
0x0001: 003d 0104 0064 00b4 0202 0202 2002 0601
0x0002: 0400 0100 0102 0601 0400 0100 0202 0280
0x0003: 0002 0202 0002 0641 0400 0000

I, [56:08#28463]  INFO -- : RecvOpen old state OpenSent new state OpenConfirm
I, [56:08#28463]  INFO -- : RecvKeepalive
D, [56:08#28463] DEBUG -- : Recv Keepalive Message (4), length: 19, [001304]

I, [56:08#28463]  INFO -- : SendKeepalive
D, [56:08#28463] DEBUG -- : Send Keepalive Message (4), length: 19, [001304]

D, [56:08#28463] DEBUG -- : SendKeepAlive
I, [56:08#28463]  INFO -- : RecvKeepAlive old state OpenConfirm new state Established
I, [56:08#28463]  INFO -- : RecvKeepalive
D, [56:08#28463] DEBUG -- : Recv Keepalive Message (4), length: 19, [001304]

I, [56:08#28463]  INFO -- : version: 4, id: 1.1.1.1, as: 100, holdtime: 20, peer addr: 192.168.1.200, local addr: 192.168.1.5 started
I, [56:08#28463]  INFO -- : SendUpdate
D, [56:08#28463] DEBUG -- : Send Update Message (2), 4 bytes AS, length: 92
  Path Attributes:
  Origin (1), length: 1, Flags [T]: incomplete
   0x0000: 
  Next Hop (3), length: 4, Flags [T]: 192.168.1.5
   0x0000: c0a8 0105
  Multi Exit Disc (4), length: 4, Flags [O]: (0x0064) 100
   0x0000: 0000 0064
  Local Pref (5), length: 4, Flags [T]: (0x0064) 100
   0x0000: 0000 0064
  As Path (2), length: 14, Flags [T]: 400 300 200
   0x0000: 0203 0000 0190 0000 012c 0000 00c8
  Communities (8), length: 12, Flags [OT]: 1311:1 311:59 2805:64
   0x0000: 051f 0001 0137 003b 0af5 0040
77.0.0.0/17
78.0.0.0/18
79.0.0.0/19

0x0000: ffff ffff ffff ffff ffff ffff ffff ffff
0x0001: 005c 0200 0000 3940 0101 0240 0304 c0a8
0x0002: 0105 8004 0400 0000 6440 0504 0000 0064
0x0003: 4002 0e02 0300 0001 9000 0001 2c00 0000
0x0004: c8c0 080c 051f 0001 0137 003b 0af5 0040
0x0005: 114d 0000 124e 0000 134f 0000

I, [56:13#28463]  INFO -- : RecvKeepalive
D, [56:13#28463] DEBUG -- : Recv Keepalive Message (4), length: 19, [001304]

I, [56:14#28463]  INFO -- : SendKeepalive
D, [56:14#28463] DEBUG -- : Send Keepalive Message (4), length: 19, [001304]

Source Code¶ ↑

Source code is hosted on github.

Installation¶ ↑

Install the gem¶ ↑

sudo gem install bgp4r

Requirements¶ ↑

License¶ ↑

BGP4R is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

BGP4R is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with BGP4R. If not, see <www.gnu.org/licenses/>.

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