- Understand Symmetric IRB
- Configure Symmetric IRB
- Configure EVPN VXLAN on Leaf3
- Establish Connectivity Between Host1, Host2, Host11 and Host22 in VRF vrf1
- Identify VNIs used for encapsulation
- Identify Route Types used in a symmetric EVPN IRB setup
- Launch lab 6 from the Arista Test Drive
- Configure EVPN VXLAN on Leaf3
- Configure vlan 112 with vni 1112 and an anycast SVI on Leaf1 and Leaf3
- Configure Host11 (Leaf2) to be a host in vlan 112 connected to Leaf1
- Configure Host 22 (Leaf4) to be a host in vlan 112 connected to Leaf3
- Configure static routes on Host11 and Host22
- Configure a static route on Host1 and Host2
- Test reachability between all hosts
- Check BGP EVPN route-types and routing table
- Do some tcpdumps to check the VNIs used in each case
Go to the Lab Access link for this step
On Leaf3
- Configure Loopback0 using 172.16.0.5/32
- Configure Loopback1 using 3.3.3.3/32
- Configure vlan 2003
- Configure P2P interfaces to Spine Switches (*)
- Configure BGP peering to Spine Switches for the Underlay
- Check BGP peers
- Configure BGP peering to Spine Switches for the Overlay
- Check EVPN BGP peers
- Configure a VRF instance named vrf1 and enable routing for it
(*) Hint: Look at the Spine Switches configuration and use LLDP
On Leaf1 and Leaf3
- Configure VLAN 112
- Configure a MAC VRF for this vlan
- Configure VLAN to VNI mapping on the VXLAN interface using vni 1112 for vlan 112
- Configure SVI with the anycast IP address 172.16.112.1/24 in vrf1
On Leaf1
- Configure VLAN 2001
- Configure a MAC VRF for this VLAN
- Configure VLAN to VNI mapping on the VXLAN interface using vni 2001
- Configure SVI with the anycast IP address 172.16.115.1/24 in vrf1 for VLAN 2001
On Leaf3:
- Configure VLAN 2003
- Configure a MAC VRF for this VLAN
- Configure VLAN to VNI mapping on the VXLAN interface using vni 2003
- Configure SVI with the anycast IP address 172.16.116.1/24 in vrf1 for VLAN 2003
- Configure virtual-router mac-address 00:1c:73:aa:bb:cc
- Configure Port-channel5 as an access port in VLAN 2003
- Add interface Ethernet5 to Port-channel5
On Leaf3:
- Configure VRF mapping for vrf1 using VNI 1001
- Configure the VRF under BGP
Configure Leaf2 to be a host in vlan 112 connected to Leaf1
On Leaf2
- Configure interface Ethernet1 as a routed port
- Configure it with IP address 172.16.112.11/24
- Add a static route to VLAN 2001 - subnet 172.16.115.0/24
- Add a static route to VLAN 2003 - subnet 172.16.116.0/24
On Leaf1
- Configure interface Ethernet1 as an access port in vlan 112
- Unshut interface Ethernet1
- Check connectivity from Leaf2 to its default gateway - 172.16.112.1
Configure Leaf4 to be a host in vlan 112 connected to Leaf3
On Leaf4
- Configure interface Ethernet1 as a routed port
- Configure it with IP address 172.16.112.22/24
- Add a static route to VLAN 2001 - subnet 172.16.115.0/24
- Add a static route to VLAN 2003 - subnet 172.16.116.0/24
On Leaf3
- Configure interface Ethernet1 as an access port in vlan 112
- Check connectivity from Leaf4 to its default gateway - 172.16.112.1
On Host1 and Host2
- Configure a static route to vlan 112 - subnet 172.16.112.0/24
From Host1 ping
- Host2
- Host11
- Host22
Use the following commands on the Leaf Switches and explore the outputs
- show bgp evpn summmary
- show bgp evpn
- show bgp evpn vni xx
- show bgp evpn route-type imet
- show bgp evpn route-type mac-ip
- show bgp evpn route-type ip-prefix ipv4
- show bgp evpn route-type ip-prefix x.x.x.x/y
- Run tcpdump on interfaces to Spine Switches
- Generate traffic betweens hosts across Leaf Switches
- Analyse tcpdump outputs and check the VNIs used each way
Note the following important points
- When generating inter-vlan traffic, the VNI numbers is the same both directions of the flow, thus the word symmetric
- VLANs don't need to be present on every Leaf Swicth if there is no host present on the Leaf Switch
- Note that you can also generate intra-vlan traffic inside VLAN 112, thus the term IRB: Integrated Routing and Switching