Figure 1. Network topology
BGP announcement network and route redistribution
Example model & SONiC version:
- Aurora 610
- Netberg SONiC: SONiC.202111-nba610-support.0
Announcement network
This configuration will announce network 192.168.10.0/24 to all neighbors.
- Configure IP addresses following the topology (refer to this article).
- Configure BGP in FRRouting (refer to this article)
Aurora 610-1
admin@nba610-1:~$ vtysh Hello, this is FRRouting (version 7.5.1-sonic). Copyright 1996-2005 Kunihiro Ishiguro, et al. nba610-1# co nba610-1(config)# no router bgp 65100 nba610-1(config)# router bgp 65101 nba610-1(config-router)# bgp router-id 10.10.10.1 nba610-1(config-router)# neighbor 10.0.1.0 remote-as 65200 nba610-1(config-router)# neighbor 10.0.1.0 description nba610-2 nba610-1(config-router)# address-family ipv4 unicast nba610-1(config-router-af)# network 192.168.10.0 nba610-1(config-router-af)# end nba610-1# write Note: this version of vtysh never writes vtysh.conf Building Configuration... Configuration saved to /etc/frr/zebra.conf Configuration saved to /etc/frr/bgpd.conf Configuration saved to /etc/frr/staticd.confAurora 610-2
admin@nba610-2:~$ vtysh Hello, this is FRRouting (version 7.5.1-sonic). Copyright 1996-2005 Kunihiro Ishiguro, et al. nba610-2# co nba610-2(config)# no router bgp 65100 nba610-2(config)# router bgp 65200 nba610-2(config-router)# bgp router-id 10.10.10.100 nba610-2(config-router)# neighbor 10.0.1.1 remote-as 65101 nba610-2(config-router)# neighbor 10.0.1.1 description nba610-1 nba610-2(config-router)# no bgp ebgp-requires-policy nba610-2(config-router)# end nba610-2# write Note: this version of vtysh never writes vtysh.conf Building Configuration... Configuration saved to /etc/frr/zebra.conf Configuration saved to /etc/frr/bgpd.conf Configuration saved to /etc/frr/staticd.conf - Check the result
nba610-1# show bgp ipv4 BGP table version is 12, local router ID is 10.10.10.1, vrf id 0 Default local pref 100, local AS 65101 Status codes: s suppressed, d damped, h history, * valid, > best, = multipath, i internal, r RIB-failure, S Stale, R Removed Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self Origin codes: i - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path *> 192.168.10.0/24 0.0.0.0 0 32768 i Displayed 1 routes and 1 total paths nba610-2# show ip bgp neighbors 10.0.1.1 routes BGP table version is 13, local router ID is 10.10.10.100, vrf id 0 Default local pref 100, local AS 65200 Status codes: s suppressed, d damped, h history, * valid, > best, = multipath, i internal, r RIB-failure, S Stale, R Removed Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self Origin codes: i - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path *> 192.168.10.0/24 10.0.1.1 0 0 65101 i Displayed 1 routes and 1 total paths
Redistribute routes to BGP
Route redistribution allows a network that uses one routing protocol to route traffic dynamically based on information learned from a different routing protocol.
Redistribution configuration works under the target address-family section.
nba610-2(config-router)# address-family
ipv4 ipv6 l2vpnEnter Vty shell and configure your BGP ASN.
nba610-2# co
nba610-2(config)# router bgp 65200
nba610-2(config-router)# address-family ipv4 unicast
nba610-2(config-router-af)# redistribute connected
nba610-2(config-router-af)# redistribute kernel
nba610-2(config-router-af)# redistribute static |
SONiC FRRouting supports only connected, kernel, and static route redistribution. |
connected Connected routes (directly attached subnet or host)
kernel Kernel routes (not installed via the zebra RIB)
static Statically configured routes