- Understand Asymmetric IRB
- Configure Asymmetric IRB
- Configure EVPN VXLAN on Leaf3
- Establish Connectivity Between Host1, Host2, Host11 and Host22
- Identify VNIs used for encapsulation
- Identify Route Types used in a asymmetric EVPN IRB setup
- Launch lab 6 from the Arista Test Drive
- Remove vrf1 on Leaf1
- 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
This lab has been initially set up for L3 EVPN. Some changes need to be made in the configuration before starting the lab.
On Leaf1
- Remove the VRF vrf1 to VNI mapping on the VXLAN interface
- Remove the VRF vrf1 in the bgp configuration
- Remove VRF vrf1 on interface VLAN 2001
- Reconfigure the ip address virtual on interface VLAN 2001 - 172.16.115.1/24
On Leaf3
- Configure Loopback0 using 172.16.0.5/32
- Configure Loopback1 using 3.3.3.3/32
- 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
(*) 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
On Leaf1 and Leaf3
- Configure VLAN 2001 and VLAN 2003
- Configure a MAC VRF for these VLANs
- Configure VLAN to VNI mapping on the VXLAN interface using vni 2001 and 2003
- Configure SVI with the anycast IP address 172.16.115.1/24 for VLAN 2001
- Configure SVI with the anycast IP address 172.16.116.1/24 for VLAN 2003
On Leaf3
- 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
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
- 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, VNI numbers change according to the direction of the flow, thus the word asymmetric
- Every VLAN needs to be present on every Leaf Swicth even 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