Net::BGP::NLRI(3pm)

1Net::BGP::NLRI(3)     User Contributed Perl Documentation    Net::BGP::NLRI(3)
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NAME

6       "Net::BGP::NLRI" - Class encapsulating BGP-4 NLRI information
7

SYNOPSIS

9           use Net::BGP::NLRI qw( :origin );
10
11           # Constructor
12           $nlri = Net::BGP::NLRI->new(
13               Aggregator      => [ 64512, '10.0.0.1' ],
14               AtomicAggregate => 1,
15               AsPath          => Net::BGP::ASPath->new("64512 64513 64514"),
16               Communities     => [ qw( 64512:10000 64512:10001 ) ],
17               LocalPref       => 100,
18               MED             => 200,
19               NextHop         => '10.0.0.1',
20               Origin          => INCOMPLETE,
21           );
22
23           # Object Copy
24           $clone = $nlri->clone();
25
26           # Accessor Methods
27           $aggregator_ref   = $nlri->aggregator($aggregator_ref);
28           $atomic_aggregate = $nlri->atomic_aggregate($atomic_aggregate);
29           $as_path          = $nlri->as_path($as_path);
30           $communities_ref  = $nlri->communities($communities_ref);
31           $local_pref       = $nlri->local_pref($local_pref);
32           $med              = $nlri->med($med);
33           $next_hop         = $nlri->next_hop($next_hop);
34           $origin           = $nlri->origin($origin);
35           $string           = $nlri->asstring;
36
37           # Preference Comparisons
38           if ($nlri1  < $nlri2) { ... };
39           if ($nlri1  > $nlri2) { ... };
40           if ($nlri1 == $nlri2) { ... };
41           if ($nlri1 != $nlri2) { ... };
42           @sorted = sort { $a <=> $b } ($nlri1, $nlri2, $nlri3, ... );
43
44           # Comparison
45           if ($nlri1 eq $nlri2) { ... };
46           if ($nlri1 ne $nlri2) { ... };
47

DESCRIPTION

49       This module encapsulates the data used by BGP-4 to represent network
50       reachability information.  It provides a constructor, and accessor
51       methods for each of the well-known path attributes. A BGP-4 UPDATE
52       message includes this information along with a list of networks for
53       which the information should be used (and a list of networks no longer
54       accessible). See Net::BGP::Update for more infomration.
55

CONSTRUCTOR

57       new() - create a new "Net::BGP::NLRI" object
58
59           $nlri = Net::BGP::NLRI->new(
60               Aggregator      => [ 64512, '10.0.0.1' ],
61               AsPath          => Net::BGP::ASPath->new("64512 64513 64514"),
62               AtomicAggregate => 1,
63               Communities     => [ qw( 64512:10000 64512:10001 ) ],
64               LocalPref       => 100,
65               MED             => 200,
66               NextHop         => '10.0.0.1',
67               Origin          => INCOMPLETE,
68           );
69
70       This is the constructor for "Net::BGP::NLRI" objects. It returns a
71       reference to the newly created object. The following named parameters
72       may be passed to the constructor. See RFC 1771 for the semantics of
73       each path attribute.
74
75   Aggregator
76       This parameter corresponds to the AGGREGATOR path attribute. It is
77       expressed as an array reference, the first element of which is the AS
78       number (in the range of an 16-bit unsigned integer) of the route
79       aggregator, and the second element is the aggregator's IP address
80       expressed in dotted-decimal notation as a string. It may be omitted, in
81       which case no AGGREGATOR path attribute will be attached to the UPDATE
82       message.
83
84   AsPath
85       This parameter corresponds to the AS_PATH path attribute. The AS_PATH
86       is expressed as an Net::BGP::ASPath object. If expressed otherwise, a
87       Net::BGP::ASPath object is tried to be constructed using the argument.
88
89   AtomicAggregate
90       This parameter corresponds to the ATOMIC_AGGREGATE path attribute. It
91       is a boolean value so any value which perl interprets as true/false may
92       be used. It may be omitted, in which case no ATOMIC_AGGREGATE path
93       attribute will be attached to the UPDATE message.
94
95   Communities
96       This parameter corresponds to the COMMUNITIES attribute defined in RFC
97       1997.  It is expressed as an array reference of communities which apply
98       to the route(s). The communities are encoded in a special format:
99       AAAA:CCCC, where AAAA corresponds to the 16-bit unsigned integer AS
100       number, and CCCC is a 16-bit unsigned integer of arbitrary value. But
101       see RFC 1997 for the semantics of several reserved community values.
102       This attribute may be omitted, in which case no COMMUNITIES attribute
103       will be attached to the UPDATE message.
104
105   LocalPref
106       This parameter corresponds to the LOCAL_PREF path attribute. It is
107       expressed as a 32-bit unsigned integer scalar value. It may be omitted,
108       in which case no LOCAL_PREF path attribute will be attached to the
109       UPDATE message.
110
111   MED
112       This parameter corresponds to the MULTI_EXIT_DISC path attribute. It is
113       expressed as a 32-bit unsigned integer scalar value. It may be omitted,
114       in which case no MULTI_EXIT_DISC path attribute will be attached to the
115       UPDATE message.
116
117   NextHop
118       This parameter corresponds to the NEXT_HOP path attribute. It is
119       expressed as a dotted-decimal IP address as a perl string. This path
120       attribute is mandatory and the parameter must always be provided to the
121       constructor.
122
123   Origin
124       This parameter corresponds to the ORIGIN path attribute. It is
125       expressed as an integer scalar value, which can take the following
126       enumerated values: IGP, EGP, or INCOMPLETE. The preceding symbols can
127       be imported into the program namespace individually or by the :origin
128       export tag. This path attribute is mandatory and the parameter must
129       always be provided to the constructor.
130

OBJECT COPY

132       clone() - clone a "Net::BGP::NLRI" object
133
134           $clone = $nlri->clone();
135
136       This method creates an exact copy of the "Net::BGP::NLRI" object with
137       Path Attributes fields matching those of the original object.
138

ACCESSOR METHODS

140       aggregator()
141
142       as_path()
143
144       atomic_aggregate()
145
146       communities()
147
148       local_pref()
149
150       med()
151
152       next_hop()
153
154       origin()
155
156       These accessor methods return the value(s) of the associated path
157       attribute fields if called with no arguments. If called with arguments,
158       they set the associated field. The representation of parameters and
159       return values is the same as described for the corresponding named
160       constructor parameters above.
161
162       asstring()
163
164       This accessor method returns a print-friendly string with some, but not
165       all, of the information contained in the object.
166

EXPORTS

168       The module exports the following symbols according to the rules and
169       conventions of the "Exporter" module.
170
171       :origin
172           IGP, EGP, INCOMPLETE
173

AUTHOR

184       Stephen J. Scheck <sscheck@cpan.org>
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188perl v5.34.0                      2022-01-21                 Net::BGP::NLRI(3)