Update schema and devices configuration

documentation/eos configuration/spine1.md

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+# Spine 1 configuration
+
+## Pre-config Setup
+
+Enable the multi-agent configuration on Arista switch to be able to use EVPN feature
+
+```config
+service routing protocols model multi-agent
+```
+
+## IP address Configuration
+
+Configure need to match with [Lab Topology](../../lab_vxlan.yml)
+
+```yml
+links:
+        - endpoints: ["spine1:eth1", "leaf1:eth1"]
+        - endpoints: ["spine1:eth2", "leaf2:eth1"]
+        - endpoints: ["leaf1:eth2", "host1:eth1"]
+        - endpoints: ["leaf2:eth2", "host2:eth1"]
+```
+
+That means :
+
+```config
+interface Ethernet1
+description TO_LEAF01
+no switchport
+ip address 10.1.1.0/31
+!
+interface Ethernet2
+description TO_LEAF02
+no switchport
+ip address 10.1.1.2/31
+```
+
+## BGP Protocol
+
+```config
+router bgp 65001
+router-id 10.10.100.1
+maximum-paths 4 ecmp 4
+neighbor LEAF_GROUP peer group
+neighbor LEAF_GROUP allowas-in 1
+neighbor LEAF_GROUP ebgp-multihop 4
+neighbor LEAF_GROUP send-community extended
+neighbor LEAF_GROUP maximum-routes 12000
+neighbor 10.1.1.1 peer group LEAF_GROUP
+neighbor 10.1.1.1 remote-as 65101
+neighbor 10.1.1.3 peer group LEAF_GROUP
+neighbor 10.1.1.3 remote-as 65102
+!
+address-family ipv4
+neighbor 10.1.1.1 activate
+neighbor 10.1.1.3 activate
+```