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Lab 3: Configure the border leafs to extend the underlay and EVPN domain

Description

In this lab, we will configure Layer 3 point-to-point links between s1-brdr1 and s2-brdr1 and between s1-brdr2 and s2-brdr2, create underlay eBGP sessions on these links and EVPN overlay sessions to extend the EVPN domains. At the end of this lab, POD1 and POD2 will share the same underlay and form a single EVPN domain: all Loopback0 interfaces must be reachable from any leafs.

Instructions

  1. Connect first to a border leaf and check the underlay and EVPN BGP sessions: 
    s1-brdr2#show ip bgp summary
BGP summary information for VRF default
Router identifier 172.16.0.6, local AS number 65103
Neighbor Status Codes: m - Under maintenance
Description              Neighbor    V AS           MsgRcvd   MsgSent  InQ OutQ  Up/Down State   PfxRcd PfxAcc
s1-spine1_Ethernet8      10.0.0.20   4 65100             22        21    0    0 00:10:33 Estab   7      7
s1-spine2_Ethernet8      10.0.0.22   4 65100             22        19    0    0 00:10:33 Estab   7      7
s1-brdr1                 169.254.0.0 4 65103             20        21    0    0 00:10:30 Estab   10     10
s1-brdr2#show bgp evpn summary
BGP summary information for VRF default
Router identifier 172.16.0.6, local AS number 65103
Neighbor Status Codes: m - Under maintenance
Description              Neighbor   V AS           MsgRcvd   MsgSent  InQ OutQ  Up/Down State   PfxRcd PfxAcc
s1-spine1                172.16.1.1 4 65100             16        16    0    0 00:10:38 Estab   0      0
s1-spine2                172.16.1.2 4 65100             16        16    0    0 00:10:39 Estab   0      0
s1-brdr2#
  2. Go to Provisioning menu and access the Studios tab. Click on the Create Workspace button to create a workspace and give it a meaningful name like Create POD1 and POD2 border leafs configuration.
  3. Click on the Enterprise Routing studio, add a network called Datacenter1-POD1_POD2, go to the network configuration by clicking on the arrow and assign the devices s1-brdr1, s1-brdr2, s2-brdr1 and s2-brdr2 to this network using the Assigned Devices field on at the top of the screen.
  4. Next to the Global Underlay Routing section, modify the following configuration:
    • Underlay Routing must have the value BGP.
    • BGP Peer Group Name must have the value IPv4-DCI-PEERS.
  5. Go to the Edge Router Domains table and add domain named POD1 and POD2.
  6. Go to POD1 domain configuration and assign devices s1-brdr1 and s1-brdr2.
  7. Under BGP Settings:
    • Enable No BGP Default IPv4 Unicast
    • Add the following CLI commands to the BGP Defaults CLI table:
      • neighbor IPv4-DCI-PEERS maximum-routes 12000
      • neighbor IPv4-DCI-PEERS send-community
  8. Go back to the domain configuration and create a BGP Peer Group named EVPN-DCI-PEERS.
  9. Under this BGP peer group configuration, modify the following configuration:
  • Address Family must have the value evpn.
  • Maximum Accepted Routes must have the value 0.
  • eBGP Multihop TTL must have the value 3.
  • BFD must have the value Yes.
  • Update Source must have the value Loopback0.
  • Next Hop must have the value Unchanged.
  1. Go back to the domain configuration and navigate to the s1-brdr1 Edge Router Domain Member configuration to modify the following fields:
  • Under Underlay Interfaces, add Ethernet4 with description P2P_LINK_TO_s2-brdr1_Ethernet4, Local IPv4 Address 10.255.0.0 and Peer ASN 65203.
  • Under BGP Peers, add 172.16.2.7 with Peer ASN 65203 and Peer Group EVPN-DCI-PEERS and Description s2-brdr1.
  1. Navigate to the s1-brdr2 Edge Router Domain Member configuration to modify the following fields:
  • Under Underlay Interfaces, add Ethernet5 with description P2P_LINK_TO_s2-brdr2_Ethernet5, Local IPv4 Address 10.255.0.2 and Peer ASN 65203.
  • Under BGP Peers, add 172.16.2.8 with Peer ASN 65203 and Peer Group EVPN-DCI-PEERS and Description s2-brdr2.
  1. Repeat steps 5 to 8 for POD2 domain configuration and assigned devices s2-brdr1 and s2-brdr2 to this domain.
  2. Navigate to the s2-brdr1 Edge Router Domain Member configuration to modify the following fields:
  • Under Underlay Interfaces, add Ethernet4 with description P2P_LINK_TO_s1-brdr1_Ethernet4, Local IPv4 Address 10.255.0.1 and Peer ASN 65103.
  • Under BGP Peers, add 172.16.1.7 with Peer ASN 65103 and Peer Group EVPN-DCI-PEERS and Description s1-brdr1.
  1. Navigate to the s2-brdr2 Edge Router Domain Member configuration to modify the following fields:
  • Under Underlay Interfaces, add Ethernet5 with description P2P_LINK_TO_s1-brdr2_Ethernet5, Local IPv4 Address 10.255.0.3 and Peer ASN 65103.
  • Under BGP Peers, add 172.16.1.8 with Peer ASN 65103 and Peer Group EVPN-DCI-PEERS and Description s1-brdr2.
  1. Click on the Review Workspace button on the top right corner. You will be taken to the Workspace screen where the inputs will be validated, the configlet generated and the configuration validated by the devices.
  2. Review the configuration changes for each device and click on Submit Workspace then View Change Control.
  3. You will be taken to the Change Control tab in the newly created change control. Review, Approve and Execute the change control.
  4. The border leafs are now configured to extend and EVPN domain services between POD1 and POD2.
  5. Connect again to a border leaf and check the underlay and EVPN BGP sessions to check the new sessions between the border leafs:
s1-brdr2#show ip bgp summary
BGP summary information for VRF default
Router identifier 172.16.1.8, local AS number 65103
Neighbor Status Codes: m - Under maintenance
Description              Neighbor    V AS           MsgRcvd   MsgSent  InQ OutQ  Up/Down State   PfxRcd PfxAcc
s1-spine1_Ethernet8      10.0.0.20   4 65100            595       599    0    0 01:30:09 Estab   7      7
s1-spine2_Ethernet8      10.0.0.22   4 65100            592       590    0    0 01:30:09 Estab   7      7
                           10.255.0.3  4 65203             47        53    0    0 00:31:34 Estab   11     11
s1-brdr1                 169.254.0.0 4 65103            591       577    0    0 01:30:09 Estab   21     21
s1-brdr2#show bgp evpn summary
BGP summary information for VRF default
Router identifier 172.16.1.8, local AS number 65103
Neighbor Status Codes: m - Under maintenance
Description              Neighbor   V AS           MsgRcvd   MsgSent  InQ OutQ  Up/Down State   PfxRcd PfxAcc
s1-spine1                172.16.1.1 4 65100            561       560    0    0 01:30:14 Estab   0      0
s1-spine2                172.16.1.2 4 65100            560       560    0    0 01:30:13 Estab   0      0
                           172.16.2.8 4 65203             61        61    0    0 00:21:22 Estab   0      0