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# $OpenBSD: bgpd.conf,v 1.26 2024/12/18 16:00:26 claudio Exp $
# example bgpd configuration file, see bgpd.conf(5)
# define our own ASN as a macro
ASN="4200000001"
# global configuration
AS $ASN
router-id 192.0.2.1
# list of networks that may be originated by our ASN
prefix-set mynetworks {
192.0.2.0/24
2001:db8:abcd::/48
}
include "/var/db/rpki-client/openbgpd"
# define bogon prefixes which should not be part of the DFZ
prefix-set bogons {
0.0.0.0/8 or-longer # 'this' network [RFC1122]
10.0.0.0/8 or-longer # private space [RFC1918]
100.64.0.0/10 or-longer # CGN Shared [RFC6598]
127.0.0.0/8 or-longer # localhost [RFC1122]
169.254.0.0/16 or-longer # link local [RFC3927]
172.16.0.0/12 or-longer # private space [RFC1918]
192.0.2.0/24 or-longer # TEST-NET-1 [RFC5737]
192.88.99.0/24 or-longer # 6to4 anycast relay [RFC7526]
192.168.0.0/16 or-longer # private space [RFC1918]
198.18.0.0/15 or-longer # benchmarking [RFC2544]
198.51.100.0/24 or-longer # TEST-NET-2 [RFC5737]
203.0.113.0/24 or-longer # TEST-NET-3 [RFC5737]
224.0.0.0/4 or-longer # multicast
240.0.0.0/4 or-longer # reserved for future use
::/8 or-longer # RFC 4291 IPv4-compatible, loopback, et al
0100::/64 or-longer # Discard-Only [RFC6666]
2001:2::/48 or-longer # BMWG [RFC5180]
2001:10::/28 or-longer # ORCHID [RFC4843]
2001:db8::/32 or-longer # docu range [RFC3849]
2002::/16 or-longer # 6to4 anycast relay [RFC7526]
3ffe::/16 or-longer # old 6bone
3fff::/20 or-longer # docu range [RFC9637]
5f00::/16 or-longer # segment routing SRv6 SIDs [RFC9602]
fc00::/7 or-longer # unique local unicast
fe80::/10 or-longer # link local unicast
fec0::/10 or-longer # old site local unicast
ff00::/8 or-longer # multicast
}
# Generate routes for the networks our ASN will originate.
# The communities (read 'tags') are later used to match on what
# is announced to EBGP neighbors
network prefix-set mynetworks set large-community local-as:1:1
# assume simple network with 3 routers in IBGP full mesh
group "ibgp mesh" {
remote-as $ASN
# use loopback for IBGP sessions, assume it's distributed in OSPF
local-address 192.0.2.1
local-address 2001:db8:abcd::1
neighbor 192.0.2.2 # router 2 ipv4
neighbor 2001:db8:abcd::2 # router 2 ipv6
neighbor 192.0.2.3 # router 3 ipv4
neighbor 2001:db8:abcd::3 # router 3 ipv6
}
# upstream providers
group "upstreams" {
neighbor 203.0.113.1 {
remote-as 65002
descr "upstream1"
}
neighbor 198.51.100.0 {
remote-as 65123
descr "upstream2-4"
}
neighbor 2001:db8:666::2 {
remote-as 65123
descr "upstream2-6"
}
}
## rules section
# uncomment the following two lines to accept a default route from upstreams
#allow from group upstreams prefix 0.0.0.0/0
#allow from group upstreams prefix ::/0
### for simple BGP setups, no editing below this line is required ###
# Outbound EBGP: only allow self originated networks to ebgp peers
# Don't leak any routes from upstream or peering sessions. This is done
# by checking for routes that are tagged with the large-community local-as:1:1
allow to ebgp prefix-set mynetworks large-community local-as:1:1
# deny more-specifics of our own originated prefixes
deny quick from ebgp prefix-set mynetworks or-longer
# IBGP: allow all updates to and from our IBGP neighbors
allow from ibgp
allow to ibgp
# Scrub normal and large communities relevant to our ASN from EBGP neighbors
# https://tools.ietf.org/html/rfc7454#section-11
match from ebgp set { community delete local-as:* }
match from ebgp set { large-community delete local-as:*:* }
# filter out prefixes longer than 24 or shorter than 8 bits for IPv4
# and longer than 48 or shorter than 16 bits for IPv6.
allow from any inet prefixlen 8 - 24
allow from any inet6 prefixlen 16 - 48
# Honor requests to gracefully shutdown BGP sessions
# https://tools.ietf.org/html/rfc8326
match from ebgp community GRACEFUL_SHUTDOWN set { localpref 0 }
deny quick from any prefix-set bogons
# deny RPKI invalid, built by rpki-client(8), see root crontab
deny quick from ebgp ovs invalid
# filter bogon AS numbers
# AS_TRANS (23456) is not supposed to show up in any path and indicates a
# misconfiguration. Additionally Private or Reserved ASNs have no place in
# the public DFZ. https://www.iana.org/assignments/as-numbers/as-numbers.xhtml
deny quick from any AS 23456
deny quick from any AS 64496 - 131071
deny quick from any AS 4200000000 - 4294967295
# filter out too long paths
deny from any max-as-len 100
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