1 | # encoding: utf-8 |
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2 | """ |
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3 | igptags.py |
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4 | |||
5 | Created by Evelio Vila on 2016-12-01. |
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6 | Copyright (c) 2014-2017 Exa Networks. All rights reserved. |
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7 | """ |
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8 | |||
9 | from struct import unpack |
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10 | |||
11 | from exabgp.bgp.message.notification import Notify |
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12 | from exabgp.bgp.message.update.attribute.bgpls.linkstate import LINKSTATE |
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13 | |||
14 | # The IGP Route Tag TLV carries original IGP Tags (IS-IS [RFC5130] or |
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15 | # OSPF) of the prefix and is encoded as follows: |
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16 | # |
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17 | # 0 1 2 3 |
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18 | # 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
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19 | # +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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20 | # | Type | Length | |
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21 | # +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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22 | # // Route Tags (one or more) // |
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23 | # +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
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24 | # https://tools.ietf.org/html/rfc7752#section-3.3.3.2 |
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25 | |||
26 | |||
27 | @LINKSTATE.register() |
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28 | class IgpTags(object): |
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29 | TLV = 1153 |
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30 | |||
31 | def __init__(self, igptags): |
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32 | self.igptags = igptags |
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33 | |||
34 | def __repr__(self): |
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35 | return "IGP Route Tags: %s" % (self.igptags) |
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36 | |||
37 | @classmethod |
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38 | def unpack(cls, data, length): |
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39 | return cls([unpack("!L", _)[0] for _ in split(data, 4)]) |
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40 | |||
41 | |||
42 | def json(self, compact=None): |
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43 | return '"igp-route-tags": %s' % self.igptags |
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44 |