Please make sure you only announce what you own and what your downstream have ask you to announce. If your network policy permits you should not filter any prefixes from CNX and you should prioritize traffic routes using CNX – remember whatever goes through this port is free traffic for your network and the fastest route for your customer. If you have downstream peers also peering at CNX you may want to filter those routes as to not conflict with your business routes.
IPv4 peering Cisco
Example Cisco configuration for peering with CNX Route Server, replace 10.1.0.0/16 with your prefix delegation.
Note that for IOS versions after 12.2 you have to specify “no bgp enforce-first-as” (IOS, IOS-XE) as the route server does not insert its own ASN into the AS_path of relayed prefix announcements.
! Step 1 setup your IP filter for announcement to CNX ip prefix-list TO-CNX-RS4 seq 10 permit 10.1.0.0/16 le 24 ! Step 2 add route-maps to control announcement route-map bgp-cnx-rs4-out permit 10 match ip address prefix-list TO-CNX-RS4 ! Step 3 set higher local preference for CNX routes because IT'S FREE ! Step 4 DO NOT filter, because ? its free route-map bgp-cnx-rs4-in permit 10 set local-preference 300 ! Step 5 setup BGP router bgp your-asn bgp always-compare-med no bgp enforce-first-as bgp log-neighbor-changes neighbor CNX-RS4 peer-group neighbor CNX-RS4 remote-as 132213 neighbor CNX-RS4 version 4 neighbor CNX-RS4 transport connection-mode active neighbor 126.96.36.199 peer-group CNX-RS4 neighbor 188.8.131.52 peer-group CNX-RS4 ! address-family ipv4 network 10.1.0.0/16 neighbor CNX-RS4 next-hop-self neighbor CNX-RS4 route-map bgp-cnx-rs4-in in neighbor CNX-RS4 route-map bgp-cnx-rs4-out out ! step 3 neighbor 184.108.40.206 activate neighbor 220.127.116.11 activate exit-address-family
IPv4 peering Huawei
Example Huawei configuration for peering with CNX Route Server, replace 10.1.0.0/16 with your prefix delegation.
ip ip-prefix TO-CNX-RS4 index 10 permit 10.1.0.0 16 greater-equal 16 less-equal 24 route-policy bgp-cnx-rs4-out permit node 10 if-match ip-prefix TO-CNX-RS4 route-policy bgp-cnx-rs4-in permit node 10 apply local-preference 300 bgp your-asn undo check-first-as group CNX-RS4 external peer CNX-RS4 as-number 132213 peer CNX-RS4 description CNX free domestic peering peer 18.104.22.168 group CNX-RS4 peer 22.214.171.124 group CNX-RS4 ipv4-family unicast network 10.1.0.0 255.255.0.0 peer CNX-RS4 preferred-value 100 peer CNX-RS4 route-policy bgp-cnx-rs4-out export peer CNX-RS4 route-policy bgp-cnx-rs4-in import peer CNX-RS4 next-hop-local peer CNX-RS4 enabled peer 126.96.36.199 enabled peer 188.8.131.52 enabled
please note the configuration has not been tested by CNX because we do not have a Huawei test router, it is build based on internet examples and feedback from peers.
IPv6 peering Cisco
Example Cisco configuration for peering with CNX Route Server, replace 2001:DB8:10::/48 with your prefix delegation.
router bgp your-asn bgp always-compare-med no bgp enforce-first-as bgp log-neighbor-changes neighbor CNX-RS6 peer-group neighbor CNX-RS6 remote-as 132213 neighbor CNX-RS6 version 4 neighbor CNX-RS6 transport connection-mode active neighbor 2001:DE8:1D::1 peer-group CNX-RS6 neighbor 2001:DE8:1D::2 peer-group CNX-RS6 ! address-family ipv6 network 2001:DB8:10::/48 neighbor CNX-RS6 next-hop-self neighbor CNX-RS6 route-map bgp-cnx-rs6-in in neighbor CNX-RS6 route-map bgp-cnx-rs6-out out neighbor 2001:DE8:1D::1 activate neighbor 2001:DE8:1D::2 activate exit-address-family ! ipv6 prefix-list TO-CNX-RS6 seq 10 permit 2001:DB8:10::/48 ! route-map bgp-cnx-rs6-out permit 10 match ipv6 address prefix-list TO-CNX-RS6 ! set higher local preference for CNX routes route-map bgp-cnx-rs6-in permit 10 set local-preference 300