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List: bird-users
Subject: BGP VPNv4 Ext Community Filter
From: "Hombach, Tobias (external - Project)" <tobias.hombach () sap ! com>
Date: 2020-08-17 9:43:25
Message-ID: AM0PR02MB4979505619ADFE20AA923787995F0 () AM0PR02MB4979 ! eurprd02 ! prod ! outlook ! com
[Download RAW message or body]
Hi,
we use BIRD 2.0.7 BGP VPNv4 and need to filter extended BGP communities on ingress. \
Config snippet:
define PFILTER_RT = [ (rt, 65100, *), (rt, 65101, *), (rt, 65102, *) ];
filter IMPORT_FILTER
{
bgp_ext_community.filter(PFILTER_RT_MASTER);
accept;
}
protocol bgp 'my-router' from VPN4_S3_TPL_BGP_DEFAULT
{
vpn4 mpls {
import filter IMPORT_FILTER;
};
}
This is working as expected. We discovered that RO communities are filtered too (not \
a surprise) and we extended the definition:
define PFILTER_RT = [ (rt, 65100, *), (rt, 65101, *), (rt, 65102, *), (ro, 65100, *), \
(ro, 65101, *), (ro, 65102, *) ];
We dont need to filter strict for RO communities and best would be to allow all. Is \
there a better way to allow only defined RT and all RO communities? Are there any \
plans to allow wildcard or range in these definitions? Like: (ro, *, *) or \
(ro, 100..300, *)
Another question: Are other extended community sub types beside RO and RT (as defined \
in RFC 7153) filtered by function bgp_ext_community.filter() ?
Thanks in advance
Regards
Tobias
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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">we use BIRD 2.0.7 BGP VPNv4 and need to \
filter extended BGP communities on ingress. Config snippet:<o:p></o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p> <p \
class="MsoNormal">define PFILTER_RT = [ (rt, 65100, *), (rt, 65101, *), (rt, 65102, \
*) ];<o:p></o:p></p> <p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">filter IMPORT_FILTER<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">{<o:p></o:p></span></p>
<p class="MsoNormal"><span \
lang="EN-US"> \
bgp_ext_community.filter(PFILTER_RT_MASTER);<o:p></o:p></span></p> <p \
class="MsoNormal"><span \
lang="EN-US"> \
accept;<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US">}<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US">protocol bgp 'my-router' from \
VPN4_S3_TPL_BGP_DEFAULT<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US">{<o:p></o:p></span></p> <p class="MsoNormal"><span lang="EN-US"> \
vpn4 mpls {<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US"> import filter \
IMPORT_FILTER;<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US"> \
};<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US">}<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US">This is working as expected. We discovered that RO communities are \
filtered too (not a surprise) and we extended the definition:<o:p></o:p></span></p> \
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p> <p \
class="MsoNormal">define PFILTER_RT = [ (rt, 65100, *), (rt, 65101, *), (rt, 65102, \
*), (ro, 65100, *), (ro, 65101, *), (ro, 65102, *) ];<o:p></o:p></p> <p \
class="MsoNormal"><o:p> </o:p></p> <p class="MsoNormal"><span lang="EN-US">We \
dont need to filter strict for RO communities and best would be to allow all. Is \
there a better way to allow only defined RT and all RO communities? Are there any \
plans to allow wildcard or range in these definitions? Like: \
(ro, *, *) or \
(ro, 100..300, *)<o:p></o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US">Another question: Are other extended community \
sub types beside RO and RT (as defined in RFC 7153) filtered by function \
bgp_ext_community.filter() ?<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US">Thanks in advance<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US">Regards<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US">Tobias<o:p></o:p></span></p> </div>
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