forked from snar/bgpq3
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathbgpq3.8
292 lines (292 loc) · 9.26 KB
/
bgpq3.8
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
.\" Copyright (c) 2007-2017 Alexandre Snarskii
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.Dd Oct 27, 2008
.Dt BGPQ3 8
.Os
.Sh NAME
.Nm bgpq3
.Nd "bgp filtering automation for cisco and juniper routers"
.Sh SYNOPSIS
.Nm
.Op Fl h Ar host[:port]
.Op Fl S Ar sources
.Op Fl EPz
.Oo
.Fl f Ar asn |
.Fl F Ar fmt |
.Fl G Ar asn
.Oc
.Op Fl 2346ABbDdJjNsX
.Op Fl a Ar asn
.Op Fl r Ar len
.Op Fl R Ar len
.Op Fl m Ar max
.Op Fl W Ar len
.Ar OBJECTS
.Op "..."
.Op EXCEPT OBJECTS
.Sh DESCRIPTION
The
.Nm
utility used to generate Cisco and Juniper prefix-lists, extended
access-lists, policy-statement terms and as-path lists based on RADB data.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl 2
accept routes registered for as23456 (transition-as) (default: false)
.It Fl 3
assume that your device is asn32-safe.
.It Fl 4
generate IPv4 prefix/access-lists (default).
.It Fl 6
generate IPv6 prefix/access-lists (IPv4 by default).
.It Fl A
try to aggregate prefix-lists as much as possible (not all output
formats supported).
.It Fl a Ar asn
specify what asn shall be denied in case of empty prefix-list (OpenBGPD)
.It Fl B
generate output in OpenBGPD format (default: Cisco)
.It Fl b
generate output in BIRD format (default: Cisco).
.It Fl d
enable some debugging output.
.It Fl D
use asdot notation for Cisco as-path access-lists.
.It Fl E
generate extended access-list (Cisco), policy-statement term using
route-filters (Juniper) or [ip|ipv6]-prefix-list (Nokia).
.It Fl f Ar number
generate input as-path access-list.
.It Fl F Ar fmt
generate output in user-defined format.
.It Fl G Ar number
generate output as-path access-list.
.It Fl h Ar host[:port]
host running IRRD database (default: whois.radb.net).
.It Fl J
generate config for Juniper (default: Cisco).
.It Fl j
generate output in JSON format (default: Cisco).
.It Fl l Ar name
name of generated entry.
.It Fl L Ar limit
limit recursion depth when expanding as-sets.
.It Fl m Ar len
maximum prefix-length of accepted prefixes (default: 32 for IPv4 and
128 for IPv6).
.It Fl M Ar match
extra match conditions for Juniper route-filters.
.It Fl N
generate config for Nokia SR OS (Cisco IOS by default).
.It Fl p
accept routes registered for private ASNs (default: disabled)
.It Fl P
generate prefix-list (default, backward compatibility).
.It Fl r Ar len
allow more specific routes starting with specified masklen too.
.It Fl R Ar len
allow more specific routes up to specified masklen too.
.It Fl s
generate sequence numbers in IOS-style prefix-lists.
.It Fl S Ar sources
use specified sources only (recommended: RADB,RIPE,APNIC).
.It Fl T
disable pipelining.
.It Fl W Ar len
generate as-path strings of no more than len items (use 0 for inifinity).
.It Fl X
generate config for Cisco IOS XR devices (plain IOS by default).
.It Fl z
generate route-filter-lists (JunOS 16.2+).
.It Ar OBJECTS
means networks (in prefix format), autonomous systems, as-sets and route-sets.
.It Ar EXCEPT OBJECTS
those objects will be excluded from expansion.
.El
.Sh EXAMPLES
Generating named juniper prefix-filter for AS20597:
.nf
.RS
~>bgpq3 -Jl eltel AS20597
policy-options {
replace:
prefix-list eltel {
81.9.0.0/20;
81.9.32.0/20;
81.9.96.0/20;
81.222.128.0/20;
81.222.192.0/18;
85.249.8.0/21;
85.249.224.0/19;
89.112.0.0/19;
89.112.4.0/22;
89.112.32.0/19;
89.112.64.0/19;
217.170.64.0/20;
217.170.80.0/20;
}
}
.RE
.fi
.Pp
For Cisco we can use aggregation (-A) flag to make this prefix-filter
more compact:
.nf
.RS
~>bgpq3 -Al eltel AS20597
no ip prefix-list eltel
ip prefix-list eltel permit 81.9.0.0/20
ip prefix-list eltel permit 81.9.32.0/20
ip prefix-list eltel permit 81.9.96.0/20
ip prefix-list eltel permit 81.222.128.0/20
ip prefix-list eltel permit 81.222.192.0/18
ip prefix-list eltel permit 85.249.8.0/21
ip prefix-list eltel permit 85.249.224.0/19
ip prefix-list eltel permit 89.112.0.0/18 ge 19 le 19
ip prefix-list eltel permit 89.112.4.0/22
ip prefix-list eltel permit 89.112.64.0/19
ip prefix-list eltel permit 217.170.64.0/19 ge 20 le 20
.RE
.fi
- you see, prefixes 89.112.0.0/19 and 89.112.32.0/19 now aggregated
into single entry 89.112.0.0/18 ge 19 le 19.
.Pp
Well, for Juniper we can generate even more interesting policy-options,
using -M <extra match conditions>, -R <len> and hierarchical names:
.nf
.RS
~>bgpq3 -AJEl eltel/specifics -r 29 -R 32 -M "community blackhole" AS20597
policy-options {
policy-statement eltel {
term specifics {
replace:
from {
community blackhole;
route-filter 81.9.0.0/20 prefix-length-range /29-/32;
route-filter 81.9.32.0/20 prefix-length-range /29-/32;
route-filter 81.9.96.0/20 prefix-length-range /29-/32;
route-filter 81.222.128.0/20 prefix-length-range /29-/32;
route-filter 81.222.192.0/18 prefix-length-range /29-/32;
route-filter 85.249.8.0/21 prefix-length-range /29-/32;
route-filter 85.249.224.0/19 prefix-length-range /29-/32;
route-filter 89.112.0.0/17 prefix-length-range /29-/32;
route-filter 217.170.64.0/19 prefix-length-range /29-/32;
}
}
}
}
.RE
.fi
generated policy-option term now allows all specifics with prefix-length
between /29 and /32 for eltel networks if they match with special community
blackhole (defined elsewhere in configuration).
.Pp
Of course, this version supports IPv6 (-6):
.nf
.RS
~>bgpq3 -6l as-retn-6 AS-RETN6
no ipv6 prefix-list as-retn-6
ipv6 prefix-list as-retn-6 permit 2001:7fb:fe00::/48
ipv6 prefix-list as-retn-6 permit 2001:7fb:fe01::/48
[....]
.RE
.fi
and support for ASN 32 is also here
.nf
.RS
~>bgpq3 -J3f 112 AS-SPACENET
policy-options {
replace:
as-path-group NN {
as-path a0 "^112(112)*$";
as-path a1 "^112(.)*(1898|5539|8495|8763|8878|12136|12931|15909)$";
as-path a2 "^112(.)*(21358|23456|23600|24151|25152|31529|34127|34906)$";
as-path a3 "^112(.)*(35052|41720|43628|44450|196611)$";
}
}
.RE
.fi
see AS196611 in the end of the list ? That's AS3.3 in 'asplain' notation.
.Pp
For non-ASN32 capable routers you should not use switch -3,
and the result will be next:
.nf
.RS
~>bgpq3 -f 112 AS-SPACENET
no ip as-path access-list NN
ip as-path access-list NN permit ^112(_112)*$
ip as-path access-list NN permit ^112(_[0-9]+)*_(1898|5539|8495|8763)$
ip as-path access-list NN permit ^112(_[0-9]+)*_(8878|12136|12931|15909)$
ip as-path access-list NN permit ^112(_[0-9]+)*_(21358|23456|23600|24151)$
ip as-path access-list NN permit ^112(_[0-9]+)*_(25152|31529|34127|34906)$
ip as-path access-list NN permit ^112(_[0-9]+)*_(35052|41720|43628|44450)$
.RE
.fi
.Pp
AS196611 is no more in the list, however, AS23456 (transition AS)
would be added to list if it were not present.
.Sh USER-DEFINED FORMAT
If you want to generate configuration not for routers, but for some
other programs/systems, you may use user-defined formatting, like in
example below:
.nf
.RS
user@host:~>bgpq3 -F "ipfw add pass all from %n/%l to any\\n" as3254
ipfw add pass all from 62.244.0.0/18 to any
ipfw add pass all from 91.219.29.0/24 to any
ipfw add pass all from 91.219.30.0/24 to any
ipfw add pass all from 193.193.192.0/19 to any
.RE
.fi
.Pp
Recognized format characters: %n - network, %l - mask length,
%N - object name, %m - object mask and %i - inversed mask.
Recognized escape characters: \\n - new line, \\t - tabulation.
Please note that no new lines inserted automatically after each sentence,
you have to add them into format string manually, elsewhere output will
be in one line (sometimes it makes sense):
.nf
.RS
user@host:~>bgpq3 -6F "%n/%l; " as-eltel
2001:1b00::/32; 2620:4f:8000::/48; 2a04:bac0::/29; 2a05:3a80::/48;
.RE
.fi
.Sh DIAGNOSTICS
When everything is OK,
.Nm
generates access-list to standard output and exits with status == 0.
In case of errors they are printed to stderr and program exits with
non-zero status.
.Sh SEE ALSO
.Sy http://www.radb.net/
Routing Arbiter project
.Sy http://tools.ietf.org/html/draft-michaelson-4byte-as-representation-05
for information on 'asdot' and 'asplain' notations.
.Sy http://www.cisco.com/en/US/docs/ios/12_0s/release/ntes/120SNEWF.html#wp3521658
for information on Cisco implementation of ASN32.
.Sh AUTHOR
.An Alexandre Snarskii Aq [email protected]