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@wtremmel
wtremmel committed Feb 9, 2024
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<title>Prefix length - DENOG Routing Guide</title>
<title>Prefix length filtering - DENOG Routing Guide</title>



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<h1>Prefix length</h1>


<h1 id="prefix-length-filtering">Prefix length filtering</h1>
<p>Normally (there are exceptions), prefixes are announced in certain minimum and maximum lengths in the global Internet routing table. Currently, they are:</p>
<ul>
<li><strong>IPv4, minimum size</strong> is /24. No smaller networks should be announced. Possible exceptions: \Gls{blackholing}, or an announcement in combination with a NO-EXPORT community set from a customer to his upstream.</li>
<li><strong>IPv6, minimum size</strong> is /48. Same exceptions as within IPv4.</li>
<li><strong>IPv4, maximum size</strong> is a /8. Larger networks are not announced. Depending on your set-up, you might want to accept the default-route 0.0.0.0/0 from your upstream providers.</li>
<li><strong>IPv6, maximum size</strong> is currently a /16 (please take this with a grain of salt, this number might already have changed). The remark about accepting a default-route ::0 is the same.</li>
</ul>
<p>Configuration examples:</p>
<div class="tabbed-set tabbed-alternate" data-tabs="1:1"><input checked="checked" id="__tabbed_1_1" name="__tabbed_1" type="radio" /><div class="tabbed-labels"><label for="__tabbed_1_1">Cisco IOS</label></div>
<div class="tabbed-content">
<div class="tabbed-block">
<p>Using an <em>unwanted</em> prefix-list you can add more prefixes to it that you not want. This shortens your configuration but might also decrease readability.
```
ip prefix-list ipv4-unwanted permit 0.0.0.0/0 ge 25 le 32
ip prefix-list ipv4-unwanted permit 0.0.0.0/0 ge 1 le 7
!
route-map upstream-in-v4 deny 50
match ip address prefix-list ipv4-unwanted
!
ipv6 prefix-list ipv6-unwanted permit ::/0 ge 49 le 128
ipv6 prefix-list ipv6-unwanted permit ::/0 ge 0 le 16
!
route-map upstream-in-v6 deny 45
match ipv6 address prefix-list ipv6-unwanted
!
router bgp 64500
neighbor 198.51.100.1 route-map upstream-in-v4 in
!
neighbor 2001:db8::1 route-map upstream-in-v6 in
!</p>
</div>
</div>
</div>



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