EVPN With NAC Configuration Guide
- Tracy Yang
In this configuration example we will examine the EVPN with NAC use case. As shown in Figure 1 below, we have two Pica8 switches in this topology. Switch R1 has a Cisco IP phone connected with it. Switch1 is also connected with our management network that gives it access to Cisco ISE network access controller. Similarly switch R2 is also connected with a host and an IP phone.
Figure 1. EVPN with NAC Topology
The general idea in this use case is that we will first program ISE to recognize any MAB authentication requests for this IP phone device and assign it a dynamic VLAN through the Access-Accept message. This will cause the switch to put the physical port connecting the IP phone into a VLAN which is part of the VXLAN network through VLAN to VNI mapping. Once part of that VNI, the IP phone can then be accessible throughout the VXLAN network. The communication between the IP phone and other devices will pass through the VXLAN tunnel if the devices are physically located on different switches. The phone can then be managed by some kind of phone management or call manager software to establish phone connectivity throughout the network however, such configuration details are beyond the scope of this document.
The routing model used in this topology for the host computers is the EVPN Asymmetric routing model in which, when two communicating devices reside in two different VNIs, routing will take place locally on the device from one VNI to the target VNI and then data packets are bridged from one switch to the other switch and forwarded to the destination device. Since ISE will usually profile IP phone devices and put them all into a single VLAN or voice VLAN, hence such devices will belong to the same VNI even if they are connected to different switches. In this example topology, ISE will assign the dynamic VLAN ID 20 to both the IP phone devices.
Switch Configuration
This section details the configuration of the two switch devices in this topology.
R1 Switch Configuration
Step 1: Configure VLAN ID, L3 VLAN interfaces loopback interfaces and IP addressing. Interface te-1/1/10 connects to PC1 and interface te-1/1/20 connects to the IP phone.
admin@R1# set interface gigabit-ethernet te-1/1/1 family ethernet-switching native-vlan-id 4094 admin@R1# set interface gigabit-ethernet te-1/1/20 family ethernet-switching port-mode trunk admin@R1# set interface gigabit-ethernet te-1/1/2 family ethernet-switching native-vlan-id 10 admin@R1# set interface gigabit-ethernet te-1/1/10 family ethernet-switching native-vlan-id 10 admin@R1# set l3-interface loopback lo address 1.1.1.1 prefix-length 32 admin@R1# set l3-interface loopback vrf1 address 201.201.201.201 prefix-length 32 admin@R1# set l3-interface vlan-interface vlan4094 address 40.94.0.2 prefix-length 24 admin@R1# set l3-interface vlan-interface vlan10 vrf vrf1 admin@R1# set l3-interface vlan-interface vlan20 vrf vrf1 admin@R1# set l3-interface vlan-interface vlan30 vrf vrf1 admin@R1# set l3-interface vlan-interface vlan10 address 10.1.1.201 prefix-length 24 admin@R1# set l3-interface vlan-interface vlan20 address 20.1.1.201 prefix-length 24 admin@R1# set l3-interface vlan-interface vlan1111 vrf vrf1 admin@R1# set l3-interface vlan-interface vlan1111 router-mac 00:16:16:16:16:16 admin@R1# set vlans vlan-id 20 l3-interface vlan20 admin@R1# set vlans vlan-id 10 l3-interface vlan10 admin@R1# set vlans vlan-id 30 l3-interface vlan30 admin@R1# set vlans vlan-id 1111 l3-interface vlan1111 admin@R1# set vlans vlan-id 4094 l3-interface vlan4094
Step 2: Configure VXLAN VNI and map VNI IDs to VLAN IDs.
admin@R1# set vxlans source-interface lo address 1.1.1.1 admin@R1# set vxlans vni 100 vlan 1111 admin@R1# set vxlans vni 10 vlan 10 admin@R1# set vxlans vni 30 vlan 30 admin@R1# set vxlans vni 20 vlan 20 admin@R1# set vxlans vrf vrf1 l3-vni 100 prefix-routes-only admin@R1# set vxlans source-interface lo address 1.1.1.1
Step 3: Enable IP routing and configure VRF and hostname.
admin@R1# set ip routing enable true admin@R1# set ip vrf vrf1
Step 4: Configure BGP and OSPF related configuration
admin@R1# set protocols bgp local-as 65001 admin@R1# set protocols bgp router-id 1.1.1.1 admin@R1# set protocols bgp neighbor 2.2.2.2 remote-as internal admin@R1# set protocols bgp neighbor 2.2.2.2 update-source 1.1.1.1 admin@R1# set protocols bgp neighbor 2.2.2.2 evpn activate true admin@R1# set protocols bgp ipv4-unicast admin@R1# set protocols bgp evpn advertise-all-vni admin@R1# set protocols bgp evpn advertise ipv4-unicast admin@R1# set protocols bgp vrf vrf1 local-as 65001 admin@R1# set protocols bgp vrf vrf1 router-id 1.1.1.1 admin@R1# set protocols bgp vrf vrf1 evpn advertise ipv4-unicast admin@R1# set protocols ospf router-id 1.1.1.1 admin@R1# set protocols ospf network 40.94.0.0/24 area 0.0.0.0 admin@R1# set protocols ospf network 1.1.1.1/32 area 0.0.0.0
Step 5: Configure 802.1X and NAC. Specify the NAS IP, the authentication server IP which is the IP address of the ISE server in this case and authentication mode.
admin@R1# set protocols dot1x interface te-1/1/20 host-mode multiple admin@R1# set protocols dot1x interface te-1/1/20 auth-mode mac-radius admin@R1# set protocols dot1x aaa radius authentication server-ip 10.10.50.65 shared-key test admin@R1# set protocols dot1x aaa radius nas-ip 10.10.51.201
Step 6: Enable POE for interface te-1/1/20. We need this step to power up the phone device using the switch's' POE feature without needing an external power source.
admin@R1# set poe interface te-1/1/20
R2 Configuration
Step 1: Configure VLAN ID, L3 VLAN interfaces, loopback interfaces and IP addresses. Interface ge-1/1/10 connects to PC2 and interface ge-1/1/20 connects to the IP phone.
root@R2# set interface gigabit-ethernet ge-1/1/1 family ethernet-switching native-vlan-id 4094 root@R2# set interface gigabit-ethernet ge-1/1/10 family ethernet-switching native-vlan-id 30 root@R2# set interface gigabit-ethernet ge-1/1/20 family ethernet-switching port-mode trunk root@R2# set l3-interface loopback lo address 2.2.2.2 prefix-length 32 root@R2# set l3-interface loopback vrf1 address 134.134.134.134 prefix-length 32 root@R2# set l3-interface vlan-interface vlan1111 vrf vrf1 root@R2# set l3-interface vlan-interface vlan30 vrf vrf1 root@R2# set l3-interface vlan-interface vlan20 vrf vrf1 root@R2# set l3-interface vlan-interface vlan30 address 30.1.1.134 prefix-length 24 root@R2# set l3-interface vlan-interface vlan20 address 20.1.1.134 prefix-length 24 root@R2# set l3-interface vlan-interface vlan4094 address 40.94.0.1 prefix-length 24 root@R2# set vlans vlan-id 10 l3-interface vlan10 root@R2# set vlans vlan-id 20 l3-interface vlan20 root@R2# set vlans vlan-id 30 l3-interface vlan30
Step 2: Configure VXLAN VNI and map VNI IDs to VLAN IDs.
root@R2# set vlans vlan-id 1111 l3-interface vlan1111 root@R2# set vlans vlan-id 4094 l3-interface vlan4094 root@R2# set vxlans source-interface lo address 2.2.2.2 root@R2# set vxlans vni 100 vlan 1111 root@R2# set vxlans vni 10 vlan 10 root@R2# set vxlans vni 20 vlan 20 root@R2# set vxlans vni 30 vlan 30
Step 3: Enable IP routing and configure VRF and hostname.
root@R2# set system hostname R2 root@R2# set ip routing enable true root@R2# set ip vrf vrf1
Step 4: Configure BGP and OSPF related configuration
root@R2# set protocols bgp local-as 65001 root@R2# set protocols bgp router-id 2.2.2.2 root@R2# set protocols bgp neighbor 1.1.1.1 remote-as internal root@R2# set protocols bgp neighbor 1.1.1.1 update-source 2.2.2.2 root@R2# set protocols bgp neighbor 1.1.1.1 evpn activate true root@R2# set protocols bgp evpn advertise-all-vni root@R2# set protocols bgp evpn advertise ipv4-unicast root@R2# set protocols bgp vrf vrf1 local-as 65001 root@R2# set protocols bgp vrf vrf1 router-id 2.2.2.2 root@R2# set protocols bgp vrf vrf1 evpn advertise ipv4-unicast root@R2# set vxlans vrf vrf1 l3-vni 100 prefix-routes-only root@R2# set protocols ospf router-id 2.2.2.2 root@R2# set protocols ospf network 40.94.0.0/24 area 0.0.0.0 root@R2# set protocols ospf network 2.2.2.2/32 area 0.0.0.0
Step 5: Configure 802.1X and NAC. Specify the NAS IP, the authentication server IP which is the IP address of the ISE server in this case and the authentication mode.
admin@R2# set protocols dot1x interface ge-1/1/20 host-mode multiple admin@R2# set protocols dot1x interface ge-1/1/20 auth-mode mac-radius admin@R2# set protocols dot1x aaa radius authentication server-ip 10.10.50.65 shared-key test admin@R2# set protocols dot1x aaa radius nas-ip 10.10.51.134
Step 6: Enable POE for interface ge-1/1/20. We need this step to power up the phone device using the switch's' POE feature.
admin@R2# set poe interface ge-1/1/20
Note: In a more realistic network environment, DHCP access needs to be allowed in the VLAN connecting the IP phone devices to automatically assign IP address and other basic network information like DNS and gateway details. Such configurations are not implemented in this example topology.
Verify Configuration
After successful authentication from the ISE server, the switch port is assigned the dynamic VLAN as shown below in the output of the show command on R1.
admin@R1# run show dot1x interface gigabit-ethernet te-1/1/20 Interface ge-1/1/20: ============================================================ Client MAC : cc:98:91:4e:c9:a7 Status : authorized Success Auth Method : MAB Traffic Class : Other Dynamic VLAN ID : 20 (active) ============================================================
On R1 run the command run show route vrf vrf1 to display the routes. Notice below that there is a route to subnet 30.1.1.0/24.
admin@R1# run show route vrf vrf1
show ip route vrf vrf1
=======================
Codes: K - kernel route, C - connected, S - static, R - RIP,
O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
F - PBR, f - OpenFabric,
> - selected route, * - FIB route, q - queued route, r - rejected route
VRF vrf1:
K>* 0.0.0.0/0 [255/8192] unreachable (ICMP unreachable), 04:07:17
C>* 10.1.1.0/24 is directly connected, vlan10, 04:06:28
C>* 20.1.1.0/24 is directly connected, vlan20, 04:05:33
B>* 11.11.11.147/32 [200/0] via 2.2.2.2, vlan1111 onlink, weight 1, 04:05:30
C>* 30.1.1.0/24 is directly connected, vlan30, 04:06:28
C>* 201.201.201.201/32 is directly connected, vrf1, 04:07:17
show ipv6 route vrf vrf1
=========================
Codes: K - kernel route, C - connected, S - static, R - RIPng,
O - OSPFv3, I - IS-IS, B - BGP, N - NHRP, T - Table,
v - VNC, V - VNC-Direct, A - Babel, D - SHARP, F - PBR,
f - OpenFabric,
> - selected route, * - FIB route, q - queued route, r - rejected route
VRF vrf1:
C * fe80::/64 is directly connected, vlan1111, 04:06:27
C * fe80::/64 is directly connected, vlan30, 04:06:28
C>* fe80::/64 is directly connected, vlan10, 04:06:28
admin@R2# run show route vrf vrf1
show ip route vrf vrf1
=======================
Codes: K - kernel route, C - connected, S - static, R - RIP,
O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
F - PBR, f - OpenFabric,
> - selected route, * - FIB route, q - queued route, r - rejected route
VRF vrf1:
K>* 0.0.0.0/0 [255/8192] unreachable (ICMP unreachable), 00:12:12
C>* 10.1.1.0/24 is directly connected, vlan10, 00:11:23
C>* 20.1.1.0/24 is directly connected, vlan10, 00:11:33
C>* 30.1.1.0/24 is directly connected, vlan30, 00:11:23
show ipv6 route vrf vrf1
=========================
Codes: K - kernel route, C - connected, S - static, R - RIPng,
O - OSPFv3, I - IS-IS, B - BGP, N - NHRP, T - Table,
v - VNC, V - VNC-Direct, A - Babel, D - SHARP, F - PBR,
f - OpenFabric,
> - selected route, * - FIB route, q - queued route, r - rejected route
VRF vrf1:
C * fe80::/64 is directly connected, vlan1111, 00:11:22
C * fe80::/64 is directly connected, vlan30, 00:11:22
C * fe80::/64 is directly connected, vlan10, 00:11:22
C>* fe80::/64 is directly connected, vlan40, 00:11:22
Run the command run show vxlan evpn route on either R1 or R2 to check the VXLAN EVPN routes.
admin@R1# run show vxlan arp IP-ADDRESS MAC-ADDRESS VNI Status Age Interface REMOTE-VTEP --------------- ----------------- -------- -------- ------- ---------- ---------- 10.1.1.2 18:5a:58:3c:42:a1 10 Dynamic 249 te-1/1/10 20.1.1.1 17:54:56:ac:42:22 20 Dynamic 250 te-1/1/20 10.1.1.1 18:5a:58:03:35:81 10 Static 2.2.2.2 30.1.1.1 18:5a:58:03:35:81 30 Static 2.2.2.2 30.1.1.2 1c:72:1d:c9:1b:e1 30 Static 2.2.2.2
To check the VXLAN tunnels on either devices, run the command run show vxlan tunnel.
admin@R2# run show vxlan tunnel Total number of tunnels: 3 VNI 10, Encap:service-vlan-delete, Decap:service-vlan-add-replace src addr:2.2.2.2, dst addr:1.1.1.1, state:UP traffic type:all Vtep type:EVPN nexthops:40.94.0.2 output ports:ge-1/1/1 VNI 20, Encap:service-vlan-delete, Decap:service-vlan-add-replace src addr:2.2.2.2, dst addr:1.1.1.1, state:UP traffic type:all Vtep type:EVPN nexthops:40.94.0.2 output ports:ge-1/1/1 VNI 30, Encap:service-vlan-delete, Decap:service-vlan-add-replace src addr:2.2.2.2, dst addr:1.1.1.1, state:UP traffic type:all Vtep type:EVPN nexthops:40.94.0.2 output ports:ge-1/1/1 VNI 100, Encap:service-vlan-delete, Decap:service-vlan-add-replace src addr:2.2.2.2, dst addr:1.1.1.1, state:UP traffic type:all Vtep type:EVPN nexthops:40.94.0.2 output ports:ge-1/1/1
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