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# $OpenBSD: bgpd.conf,v 1.19 2020/04/23 17:12:59 sthen Exp $
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# example bgpd configuration file, see bgpd.conf(5)
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# define our own ASN as a macro
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ASN="65001"
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# global configuration
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AS $ASN
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router-id 192.0.2.1
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# list of networks that may be originated by our ASN
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prefix-set mynetworks {
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192.0.2.0/24
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2001:db8:abcd::/48
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}
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include "/var/db/rpki-client/openbgpd"
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# define bogon prefixes which should not be part of the DFZ
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prefix-set bogons {
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0.0.0.0/8 or-longer # 'this' network [RFC1122]
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10.0.0.0/8 or-longer # private space [RFC1918]
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100.64.0.0/10 or-longer # CGN Shared [RFC6598]
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127.0.0.0/8 or-longer # localhost [RFC1122]
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169.254.0.0/16 or-longer # link local [RFC3927]
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172.16.0.0/12 or-longer # private space [RFC1918]
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192.0.2.0/24 or-longer # TEST-NET-1 [RFC5737]
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192.88.99.0/24 or-longer # 6to4 anycast relay [RFC7526]
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192.168.0.0/16 or-longer # private space [RFC1918]
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198.18.0.0/15 or-longer # benchmarking [RFC2544]
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198.51.100.0/24 or-longer # TEST-NET-2 [RFC5737]
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203.0.113.0/24 or-longer # TEST-NET-3 [RFC5737]
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224.0.0.0/4 or-longer # multicast
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240.0.0.0/4 or-longer # reserved for future use
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::/8 or-longer # RFC 4291 IPv4-compatible, loopback, et al
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0100::/64 or-longer # Discard-Only [RFC6666]
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2001:2::/48 or-longer # BMWG [RFC5180]
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2001:10::/28 or-longer # ORCHID [RFC4843]
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2001:db8::/32 or-longer # docu range [RFC3849]
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2002::/16 or-longer # 6to4 anycast relay [RFC7526]
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3ffe::/16 or-longer # old 6bone
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fc00::/7 or-longer # unique local unicast
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fe80::/10 or-longer # link local unicast
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fec0::/10 or-longer # old site local unicast
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ff00::/8 or-longer # multicast
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}
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# Generate routes for the networks our ASN will originate.
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# The communities (read 'tags') are later used to match on what
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# is announced to EBGP neighbors
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network prefix-set mynetworks set large-community $ASN:1:1
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# assume simple network with 3 routers in IBGP full mesh
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group "ibgp mesh" {
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remote-as $ASN
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# use loopback for IBGP sessions, assume it's distributed in OSPF
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local-address 192.0.2.1
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local-address 2001:db8:abcd::1
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neighbor 192.0.2.2 # router 2 ipv4
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neighbor 2001:db8:abcd::2 # router 2 ipv6
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neighbor 192.0.2.3 # router 3 ipv4
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neighbor 2001:db8:abcd::3 # router 3 ipv6
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}
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# upstream providers
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group "upstreams" {
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neighbor 203.0.113.1 {
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remote-as 65002
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descr "IPv4 Transit Provider A"
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}
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neighbor 198.51.100.0 {
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remote-as 65123
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descr "IPv4 Transit provider B"
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}
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neighbor 2001:db8:666::2 {
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remote-as 65123
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descr "IPv6 Transit provider B"
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}
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}
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## rules section
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# uncomment the following two lines to accept a default route from upstreams
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#allow from group upstreams prefix 0.0.0.0/0
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#allow from group upstreams prefix ::/0
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### for simple BGP setups, no editing below this line is required ###
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# Outbound EBGP: only allow self originated networks to ebgp peers
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# Don't leak any routes from upstream or peering sessions. This is done
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# by checking for routes that are tagged with the large-community $ASN:1:1
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allow to ebgp prefix-set mynetworks large-community $ASN:1:1
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# deny more-specifics of our own originated prefixes
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deny quick from ebgp prefix-set mynetworks or-longer
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# IBGP: allow all updates to and from our IBGP neighbors
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allow from ibgp
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allow to ibgp
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# Scrub normal and large communities relevant to our ASN from EBGP neighbors
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# https://tools.ietf.org/html/rfc7454#section-11
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match from ebgp set { community delete $ASN:* }
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match from ebgp set { large-community delete $ASN:*:* }
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# filter out prefixes longer than 24 or shorter than 8 bits for IPv4
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# and longer than 48 or shorter than 16 bits for IPv6.
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allow from any inet prefixlen 8 - 24
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allow from any inet6 prefixlen 16 - 48
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# Honor requests to gracefully shutdown BGP sessions
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# https://tools.ietf.org/html/rfc8326
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match from any community GRACEFUL_SHUTDOWN set { localpref 0 }
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deny quick from any prefix-set bogons
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# deny RPKI invalid, built by rpki-client(8), see root crontab
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deny quick from ebgp ovs invalid
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# filter bogon AS numbers
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# AS_TRANS (23456) is not supposed to show up in any path and indicates a
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# missconfiguration. Additionally Private or Reserved ASNs have no place in
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# the public DFZ. http://www.iana.org/assignments/as-numbers/as-numbers.xhtml
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deny quick from any AS 23456
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deny quick from any AS 64496 - 131071
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deny quick from any AS 4200000000 - 4294967295
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# filter out too long paths
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deny from any max-as-len 100
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