FRR Learning Day 6 - EVPN Centralized L3 Gateway

Keywords: C++ sudo Ubuntu Attribute network

EVPN Centralized L3 Gateway--Trans-subnet Message Forwarding

spine configuration

Interface Configuration

sudo ip link add vbdif10 type bridge
sudo ip link add vbdif20 type bridge
sudo ip link set vbdif10 up
sudo ip link set vbdif20 up
sudo ip link add vxlan20 type vxlan id 20 local 192.168.59.130 dstport 4789 nolearning
sudo ip link add vxlan10 type vxlan id 10 local 192.168.59.130 dstport 4789 nolearning
sudo ip link set vxlan10 up
sudo ip link set vxlan20 up
sudo ip link set vxlan20 master vbdif20
sudo ip link set vxlan10 master vbdif10
sudo ip address add 2.2.2.254/24 dev vbdif10
sudo ip address add 2.2.3.254/24 dev vbdif20
#Open Forwarding
ubuntu@ubuntu:~$ sudo -i
[sudo] password for ubuntu: 
root@ubuntu:~# 
root@ubuntu:~# 
root@ubuntu:~# echo 1 > /proc/sys/net/ipv4/ip_forward
root@ubuntu:~# exit

bgp evpn configuration

router bgp 7677
 bgp router-id 192.168.59.130
 bgp bestpath as-path multipath-relax
 neighbor fabric peer-group
 neighbor fabric remote-as external
 neighbor 192.168.59.128 peer-group fabric
 neighbor 192.168.59.129 peer-group fabric
 !
 address-family l2vpn evpn
  neighbor fabric activate
  advertise-all-vni
  advertise-default-gw
 exit-address-family
!

address-family l2vpn evpn: This bgp routing supports address protocol l2vpn evpn.

neighbor fabric activate: Indicates that the address protocol is activated. After configuring the command, the device will receive and declare evpn routing.

advertise-all-vni: means declaring all local VNI to neighbors.

advertise-default-gw: Indicates that the local VNI needs to be a three-tier gateway. This command can only be configured after advertise-all-vni is opened and a vxlan tunnel is created locally. Otherwise, the following error prompt will appear:

This command is only supported under the EVPN VRF

leaf1 and host1 configuration

Interface Configuration

sudo ip netns add host1
sudo ip link add veth1 type veth peer name eth0 netns host1
sudo ip netns exec host1 ip link set lo up
sudo ip netns exec host1 ip link set eth0 up
sudo ip netns exec host1 ip addr add 2.2.2.2/24 dev eth0
sudo ip netns exec host1 ip route add default via 2.2.2.254 dev eth0   
sudo ip link add br10 type bridge
sudo ip link add vxlan10 type vxlan id 10 local 192.168.59.128 dstport 4789 nolearning
sudo ip link set br10 up
sudo ip link set vxlan10 up
sudo ip link set veth1 up  
sudo ip link set veth1 master br10
sudo ip link set vxlan10 master br10

bgp evpn configuration

router bgp 7675
 bgp router-id 192.168.59.128
 bgp bestpath as-path multipath-relax
 neighbor fabric peer-group
 neighbor fabric remote-as external
 neighbor 192.168.59.130 peer-group fabric
 !
 address-family l2vpn evpn
  neighbor fabric activate
  advertise-all-vni
 exit-address-family
!

leaf2 and host2 configuration

Interface Configuration

sudo ip netns add host2
sudo ip link add veth1 type veth peer name eth0 netns host2
sudo ip netns exec host2 ip link set lo up
sudo ip netns exec host2 ip link set eth0 up
sudo ip netns exec host2 ip addr add 2.2.3.2/24 dev eth0
sudo ip netns exec host2 ip route add default via 2.2.3.254 dev eth0   
sudo ip link add br20 type bridge
sudo ip link add vxlan20 type vxlan id 20 local 192.168.59.129 dstport 4789 nolearning
sudo ip link set br20 up
sudo ip link set vxlan20 up
sudo ip link set veth1 up  
sudo ip link set veth1 master br20
sudo ip link set vxlan20 master br20

bgp evpn configuration

router bgp 7676
 bgp router-id 192.168.59.129
 bgp bestpath as-path multipath-relax
 neighbor fabric peer-group
 neighbor fabric remote-as external
 neighbor 192.168.59.130 peer-group fabric
 !
 address-family l2vpn evpn
  neighbor fabric activate
  advertise-all-vni
 exit-address-family
!

View bgp information

spine

  • View Neighbor Information
ubuntu# show bgp neighbors 
BGP neighbor is 192.168.59.128, remote AS 7675, local AS 7677, external link
Hostname: bgpd
 Member of peer-group fabric for session parameters
  BGP version 4, remote router ID 192.168.59.128, local router ID 192.168.59.130
  BGP state = Established, up for 00:15:28
  Last read 00:00:28, Last write 00:00:28
  Hold time is 180, keepalive interval is 60 seconds
  Neighbor capabilities:
    4 Byte AS: advertised and received
    AddPath:
      IPv4 Unicast: RX advertised IPv4 Unicast and received
      L2VPN EVPN: RX advertised L2VPN EVPN and received
    Route refresh: advertised and received(old & new)
    Address Family IPv4 Unicast: advertised and received
    Address Family L2VPN EVPN: advertised and received
    Hostname Capability: advertised (name: bgpd,domain name: n/a) received (name: bgpd,domain name: n/a)
    Graceful Restart Capabilty: advertised and received
      Remote Restart timer is 120 seconds
      Address families by peer:
        none
  Graceful restart information:
    End-of-RIB send: IPv4 Unicast, L2VPN EVPN
    End-of-RIB received: IPv4 Unicast, L2VPN EVPN
  Message statistics:
    Inq depth is 0
    Outq depth is 0
                         Sent       Rcvd
    Opens:                  2          2
    Notifications:          0          2
    Updates:               14         14
    Keepalives:            17         17
    Route Refresh:          0          0
    Capability:             0          0
    Total:                 33         35
  Minimum time between advertisement runs is 0 seconds

 For address family: IPv4 Unicast
  fabric peer-group member
  Update group 9, subgroup 10
  Packet Queue length 0
  Community attribute sent to this neighbor(all)
  0 accepted prefixes

 For address family: L2VPN EVPN
  fabric peer-group member
  Update group 10, subgroup 11
  Packet Queue length 0
  NEXT_HOP is propagated unchanged to this neighbor
  Community attribute sent to this neighbor(all)
  advertise-all-vni
  2 accepted prefixes

  Connections established 2; dropped 1
  Last reset 00:15:30, due to NOTIFICATION received (Cease/Other Configuration Change)
Local host: 192.168.59.130, Local port: 42668
Foreign host: 192.168.59.128, Foreign port: 179
Nexthop: 192.168.59.130
Nexthop global: fe80::30a7:5600:4add:b313
Nexthop local: fe80::30a7:5600:4add:b313
BGP connection: shared network
BGP Connect Retry Timer in Seconds: 120
Read thread: on  Write thread: on

BGP neighbor is 192.168.59.129, remote AS 7676, local AS 7677, external link
Hostname: bgpd
 Member of peer-group fabric for session parameters
  BGP version 4, remote router ID 192.168.59.129, local router ID 192.168.59.130
  BGP state = Established, up for 00:11:21
  Last read 00:00:21, Last write 00:00:21
  Hold time is 180, keepalive interval is 60 seconds
  Neighbor capabilities:
    4 Byte AS: advertised and received
    AddPath:
      IPv4 Unicast: RX advertised IPv4 Unicast and received
      L2VPN EVPN: RX advertised L2VPN EVPN and received
    Route refresh: advertised and received(old & new)
    Address Family IPv4 Unicast: advertised and received
    Address Family L2VPN EVPN: advertised and received
    Hostname Capability: advertised (name: bgpd,domain name: n/a) received (name: bgpd,domain name: n/a)
    Graceful Restart Capabilty: advertised and received
      Remote Restart timer is 120 seconds
      Address families by peer:
        none
  Graceful restart information:
    End-of-RIB send: IPv4 Unicast, L2VPN EVPN
    End-of-RIB received: IPv4 Unicast, L2VPN EVPN
  Message statistics:
    Inq depth is 0
    Outq depth is 0
                         Sent       Rcvd
    Opens:                  2          2
    Notifications:          0          2
    Updates:               14         14
    Keepalives:            13         13
    Route Refresh:          0          0
    Capability:             0          0
    Total:                 29         31
  Minimum time between advertisement runs is 0 seconds

 For address family: IPv4 Unicast
  fabric peer-group member
  Update group 9, subgroup 10
  Packet Queue length 0
  Community attribute sent to this neighbor(all)
  0 accepted prefixes

 For address family: L2VPN EVPN
  fabric peer-group member
  Update group 10, subgroup 11
  Packet Queue length 0
  NEXT_HOP is propagated unchanged to this neighbor
  Community attribute sent to this neighbor(all)
  advertise-all-vni
  3 accepted prefixes

  Connections established 2; dropped 1
  Last reset 00:11:23, due to NOTIFICATION received (Cease/Other Configuration Change)
Local host: 192.168.59.130, Local port: 48016
Foreign host: 192.168.59.129, Foreign port: 179
Nexthop: 192.168.59.130
Nexthop global: fe80::30a7:5600:4add:b313
Nexthop local: fe80::30a7:5600:4add:b313
BGP connection: shared network
BGP Connect Retry Timer in Seconds: 120
Read thread: on  Write thread: on


ubuntu#
  • View forwarding table information
ubuntu# show bgp l2vpn evpn 
BGP table version is 2, local router ID is 192.168.59.130
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path
Route Distinguisher: ip 192.168.59.128:4

*> [2]:[0]:[48]:[3a:58:62:d5:eb:53]
                    192.168.59.128                         0 7675 i
*> [3]:[0]:[32]:[192.168.59.128]
                    192.168.59.128                         0 7675 i
Route Distinguisher: ip 192.168.59.129:4

*> [2]:[0]:[48]:[9a:d2:01:d9:8b:0b]:[128]:[fe80::e8dc:91ff:fe85:fe05]
                    192.168.59.129                         0 7676 i
*> [2]:[0]:[48]:[de:f6:18:47:27:a6]
                    192.168.59.129                         0 7676 i
*> [3]:[0]:[32]:[192.168.59.129]
                    192.168.59.129                         0 7676 i
Route Distinguisher: ip 192.168.59.130:4

*> [2]:[0]:[48]:[7e:3a:03:b3:84:d0]:[128]:[fe80::7c3a:3ff:feb3:84d0]
                    192.168.59.130                     32768 i
*> [2]:[0]:[48]:[c2:2e:49:dc:a8:17]:[32]:[2.2.3.254]
                    192.168.59.130                     32768 i
*> [3]:[0]:[32]:[192.168.59.130]
                    192.168.59.130                     32768 i
Route Distinguisher: ip 192.168.59.130:5

*> [2]:[0]:[48]:[62:06:e0:e7:b7:a4]:[128]:[fe80::6006:e0ff:fee7:b7a4]
                    192.168.59.130                     32768 i
*> [2]:[0]:[48]:[76:b9:aa:37:13:6a]:[32]:[2.2.2.254]
                    192.168.59.130                     32768 i
*> [3]:[0]:[32]:[192.168.59.130]
                    192.168.59.130                     32768 i

Displayed 11 out of 11 total prefixes
ubuntu#

Posted by MishieMoo on Wed, 09 Oct 2019 14:05:06 -0700

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