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Lukas Krattiger
Cisco Employee
Cisco Employee

After many question on "ip unnumbered" and how the configuration would look, I took a spin on the already released "ip numbered" or "p2p" approach that I posted back in May 2015.

For the sake of this example, we are using the following Topology example.

EVPN.png

The configuration example does cover the configuration of the following software components

- Underlay with OSPF, PIM Sparse (ASM) and Anycast-RP

- IP unnumbered interfaces

- VXLAN

- MP-BGP EVPN Control-Plane

- VPC

We will focus on the configuration of Spine "1", Leaf "V1" and Leaf "V2"

Spine "1" Configuration:

hostname SPINE1

nv overlay evpn

feature ospf

feature bgp

feature pim

feature nv overlay

ip pim anycast-rp 10.254.254.254 10.250.250.101

ip pim rp-address 10.254.254.254 group-list 239.239.239.0/24

interface Ethernet3/1

  description Link to Leaf "V2"

  mtu 9216

  ip unnumbered loopback0

  ip ospf network point-to-point

  ip router ospf UNDERLAY area 0.0.0.0

  ip pim sparse-mode

  no shutdown

interface Ethernet3/2

  description Link to Leaf "V1"

  mtu 9216

  ip unnumbered loopback0

  ip ospf network point-to-point

  ip router ospf UNDERLAY area 0.0.0.0

  ip pim sparse-mode

  no shutdown


interface loopback0

  ip address 10.250.250.101/32

  ip ospf network point-to-point # will change OSPF interface back to Loopback; required for VPC

  ip router ospf UNDERLAY area 0.0.0.0

  ip pim sparse-mode

interface loopback254

  ip address 10.254.254.254/32

  ip ospf network point-to-point

  ip router ospf UNDERLAY area 0.0.0.0

  ip pim sparse-mode

router ospf UNDERLAY

  router-id 10.250.250.101

  log-adjacency-changes detail

router bgp 65500

  router-id 10.250.250.101

  address-family ipv4 unicast

  neighbor 10.250.250.0/24 remote-as 65500

    update-source loopback0

    address-family ipv4 unicast # optional for "show ip bgp summary" support

    address-family l2vpn evpn

      send-community both

      route-reflector-client



Leaf "V1" Configuration:

hostname LeafV1

nv overlay evpn

feature ospf

feature bgp

feature pim

feature interface-vlan

feature vn-segment-vlan-based

feature nv overlay

feature vpc

fabric forwarding anycast-gateway-mac 2020.DEAD.BEEF

ip pim rp-address 10.254.254.254 group-list 239.239.239.0/24

vlan 1,99-101,2500,3000

vlan 99

  name L2onlyHostSegment

  vn-segment 30099

vlan 100

  name L2L3HostSegment

  vn-segment 30000

vlan 101

  name L2L3HostSegment

  vn-segment 30001

vlan 2500

  name FabricBD

  vn-segment 50000

vlan 3000

  name VPCL3Peering

route-map FABRIC-RMAP-REDIST-SUBNET permit 10

  match tag 21921

vrf context TENANT1

  vni 50000

  rd auto

  address-family ipv4 unicast

    route-target both auto

    route-target both auto evpn

  address-family ipv6 unicast

    route-target both auto

    route-target both auto evpn

vpc domain 1

  peer-switch

  peer-keepalive destination 10.2.8.1 source 10.2.8.2 vrf management

  peer-gateway

  ip arp synchronize

interface Vlan100

  no shutdown

  vrf member TENANT1

  ip address 192.168.100.1/24 tag 21921

  fabric forwarding mode anycast-gateway

interface Vlan101

  no shutdown

  vrf member TENANT1

  ip address 192.168.101.1/24 tag 21921

  fabric forwarding mode anycast-gateway

interface Vlan2500

  description FabricBD

  no shutdown

  mtu 9216

  vrf member TENANT1

  ip forward

interface Vlan3000

  description VPC Layer-3 Peering for VXLAN

  no shutdown

  ip address 10.3.1.1/30 # Requires to be individual IP per VPC member

  ip ospf network point-to-point

  ip router ospf UNDERLAY area 0.0.0.0

  ip pim sparse-mode


nve infra-vlans 3000

# required for Nexus 9x00-EX/FX or Nexus 9200

interface port-channel1

  description VPC Peer-Link

  switchport mode trunk

  spanning-tree port type network

  lacp suspend-individual

  vpc peer-link

hardware access-list tcam region vacl 0

# example region to free up space for arp-ether region


hardware access-list tcam region arp-ether 256 double-wide

# required for ARP suppression, requires reboot

# double-wide is required starting 7.0(3)I3(1)

# not required for Nexus 9x00-EX/FX or Nexus 9200

interface nve1

  mtu 9216

  no shutdown

  source-interface loopback1

  host-reachability protocol bgp

  member vni 30000

    suppress-arp

    mcast-group 239.239.239.100

  member vni 30001

    suppress-arp

    mcast-group 239.239.239.101

  member vni 30099

    mcast-group 239.239.239.99

  member vni 50000 associate-vrf

interface Ethernet1/1

  switchport mode trunk

  spanning-tree port type edge trunk

  spanning-tree bpduguard enable

interface Ethernet1/47

  description Link for VPC Peer-Link

  switchport mode trunk

  channel-group 1 mode active

interface Ethernet1/48

  description Link for VPC Peer-Link

  switchport mode trunk

  channel-group 1 mode active


interface Ethernet2/1

  description Link to Spine "1"

  no switchport

  mtu 9216

  ip unnumbered loopback0

  ip ospf network point-to-point

  ip router ospf UNDERLAY area 0.0.0.0

interface loopback0 # Loopback for Router ID, routing adjacency and peering

  ip address 10.250.250.102/32

  ip router ospf UNDERLAY area 0.0.0.0

  ip pim sparse-mode

interface loopback1 # Loopback for VTEP only

  ip address 10.254.254.102/32

  ip address 10.254.254.1/32 secondary

  ip ospf network point-to-point # will change OSPF interface back to Loopback; required for VPC

  ip router ospf UNDERLAY area 0.0.0.0

  ip pim sparse-mode

router ospf UNDERLAY

  router-id 10.250.250.102

  log-adjacency-changes detail

router bgp 65500

  router-id 10.250.250.102

  address-family ipv4 unicast

  neighbor 10.250.250.101 remote-as 65500

    update-source loopback0

    address-family ipv4 unicast # optional for "show ip bgp summary" support

    address-family l2vpn evpn

      send-community both

  vrf TENANT1

    address-family ipv4 unicast

      advertise l2vpn evpn

      redistribute direct route-map FABRIC-RMAP-REDIST-SUBNET

evpn

  vni 30000 l2

    rd auto

    route-target import auto

    route-target export auto

  vni 30001 l2

    rd auto

    route-target import auto

    route-target export auto

  vni 30099 l2

    rd auto

    route-target import auto

    route-target export auto

Leaf "V2" Configuration:

hostname LeafV2

nv overlay evpn

feature ospf

feature bgp

feature pim

feature interface-vlan

feature vn-segment-vlan-based

feature nv overlay

feature vpc

fabric forwarding anycast-gateway-mac 2020.DEAD.BEEF

ip pim rp-address 10.254.254.254 group-list 239.239.239.0/24

vlan 1,99-101,2500,3000

vlan 99

  name L2onlyHostSegment

  vn-segment 30099

vlan 100

  name L2L3HostSegment

  vn-segment 30000

vlan 101

  name L2L3HostSegment

  vn-segment 30001

vlan 2500

  name FabricBD

  vn-segment 50000

vlan 3000

  name VPCL3Peering

route-map FABRIC-RMAP-REDIST-SUBNET permit 10

  match tag 21921

vrf context TENANT1

  vni 50000

  rd auto

  address-family ipv4 unicast

    route-target both auto

    route-target both auto evpn

  address-family ipv6 unicast

    route-target both auto

    route-target both auto evpn

vpc domain 1

  peer-switch

  peer-keepalive destination 10.2.8.2 source 10.2.8.1 vrf management

  peer-gateway

  ip arp synchronize

interface Vlan100

  no shutdown

  vrf member TENANT1

  ip address 192.168.100.1/24 tag 21921

  fabric forwarding mode anycast-gateway

interface Vlan101

  no shutdown

  vrf member TENANT1

  ip address 192.168.101.1/24 tag 21921

  fabric forwarding mode anycast-gateway

interface Vlan2500

  description FabricBD

  no shutdown

  mtu 9216

  vrf member TENANT1

  ip forward

interface Vlan3000

  description VPC Layer-3 Peering for VXLAN

  no shutdown

  ip address 10.3.1.2/30 # Requires to be individual IP per VPC member

  ip ospf network point-to-point

  ip router ospf UNDERLAY area 0.0.0.0

  ip pim sparse-mode


nve infra-vlans 3000

# required for Nexus 9300-EX/FX or Nexus 9200

interface port-channel1

  description VPC Peer-Link

  switchport mode trunk

  spanning-tree port type network

  lacp suspend-individual

  vpc peer-link


hardware access-list tcam region vacl 0

# example region to free up space for arp-ether region


hardware access-list tcam region arp-ether 256 double-wide

# required for ARP suppression, requires reboot

# double-wide is required starting 7.0(3)I3(1)

# not required for Nexus 9300-EX/FX or Nexus 9200

interface nve1

  mtu 9216

  no shutdown

  source-interface loopback1

  host-reachability protocol bgp

  member vni 30000

    suppress-arp

    mcast-group 239.239.239.100

  member vni 30001

    suppress-arp

    mcast-group 239.239.239.101

  member vni 30099

    mcast-group 239.239.239.99

  member vni 50000 associate-vrf

interface Ethernet1/1

  switchport mode trunk

  spanning-tree port type edge trunk

  spanning-tree bpduguard enable

interface Ethernet1/47

  description Link for VPC Peer-Link

  switchport mode trunk

  channel-group 1 mode active

interface Ethernet1/48

  description Link for VPC Peer-Link

  switchport mode trunk

  channel-group 1 mode active


interface Ethernet2/1

  description Link to Spine "1"

  no switchport

  mtu 9216

  ip unnumbered loopback0

  ip ospf network point-to-point

  ip router ospf UNDERLAY area 0.0.0.0

  ip pim sparse-mode

  no shutdown

interface loopback0 # Loopback for Router ID, routing adjacency and peering

  ip address 10.250.250.103/32

  ip router ospf UNDERLAY area 0.0.0.0

  ip pim sparse-mode

interface loopback1 # Loopback for VTEP only

  ip address 10.254.254.103/32

  ip address 10.254.254.1/32 secondary

  ip ospf network point-to-point # will change OSPF interface back to Loopback; required for VPC

  ip router ospf UNDERLAY area 0.0.0.0

  ip pim sparse-mode

router ospf UNDERLAY

  router-id 10.250.250.103

  log-adjacency-changes detail

router bgp 65500

  router-id 10.250.250.103

  address-family ipv4 unicast

  neighbor 10.250.250.101 remote-as 65500

    update-source loopback0

    address-family ipv4 unicast # optional for "show ip bgp summary" support

    address-family l2vpn evpn

      send-community both

  vrf TENANT1

    address-family ipv4 unicast

      advertise l2vpn evpn

      redistribute direct route-map FABRIC-RMAP-REDIST-SUBNET

      maximum-paths ibgp 2

evpn

  vni 30000 l2

    rd auto

    route-target import auto

    route-target export auto

  vni 30001 l2

    rd auto

    route-target import auto

    route-target export auto

  vni 30099 l2

    rd auto

    route-target import auto

    route-target export auto


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