In SmartFabric DellEMC OS10, configuring EVPN instances and attaching virtual networks to EVPN instances, can happen in any order. The following section summarizes, configuration sequence and SmartFabric DellEMC OS10 behavior in each such event:
Prerequisites:
Each Leaf and Spine in the network needs to be configured with eBGP as IGP protocol and neighborship should be enabled with both "address family ipv4 unicast" and "address family l2vpn evpn".
In this example, numbered interfaces (connected interfaces) are used for the underlay BGP peering. These sessions distribute the peer reachability. They only distribute the IPV4 address family routes.
Loopback addresses are used for the overlay sessions. They are enabled with "l2vpn evpn" address family and distribute only the EVPN routes.
The following table captures the EVPN instance configuration sequence:
OS10# show ip bgp l2vpn evpn summary
BGP router identifier 110.111.170.102 local AS number 101
Neighbor AS MsgRcvd MsgSent Up/Down State/Pfx
110.111.170.195 100 1687 1685 1d:00:24:44
OS10# show ip bgp l2vpn evpn neighbors
BGP neighbor is 110.111.170.195, remote AS 100, local AS 101 external link
BGP version 4, remote router ID 110.111.170.195
BGP state ESTABLISHED, in this state for 2 days 17:50:18
Last read 00:30:35 seconds
Hold time is 180, keepalive interval is 60 seconds
Configured hold time is 180, keepalive interval is 60 seconds
Fall-over disabled
EBGP multihop enabled, multihop TTL set to 2
Received 4542 messages
1 opens, 0 notifications, 2 updates
4539 keepalives, 0 route refresh requests
Sent 4542 messages
1 opens, 0 notifications, 2 updates
4539 keepalives, 0 route refresh requests
Minimum time between advertisement runs is 30 seconds
Minimum time before advertisements start is 0 seconds
Capabilities received from neighbor for IPv4 Unicast:
ROUTE_REFRESH(2)
CISCO_ROUTE_REFRESH(128)
4_OCTET_AS(65)
MP_L2VPN_EVPN(1)
Capabilities advertised to neighbor for IPv4 Unicast:
ROUTE_REFRESH(2)
CISCO_ROUTE_REFRESH(128)
4_OCTET_AS(65)
MP_L2VPN_EVPN(1)
Prefixes accepted 2, Prefixes advertised 2
Connections established 1; dropped 0
Last reset never
Local host: 110.111.170.102, Local port: 179
Foreign host: 110.111.170.195, Foreign port: 44115
The following table captures the configuration events in the Explicit EVI configuration mode:
Table 2. Explicit EVI configuration eventsExplicit EVI configuration events
Current system state --->
Current configuration event
|
|
V
Start up
1. evpn disabled
2. evi 10
vni 100
rd <x:y>
rt <x:y>
1. evpn
BGP peer is notified with EVPN capability
N/A
2. virtual-network 10
vxlan-vni 100
.
N/A
BGP Peer is notified with inclusive multicast route update.
Forwarding path is enabled with VXLAN overlay.
Remote MAC learning is disabled.
3. evi deleted
N/A
BGP Peer is notified with inclusive multicast route withdrawal.
All the advertised local MAC routes are withdrawn.
4. virtual-network deleted
N/A
BGP peer is notified that inclusive multicast route is withdraw
Forwarding path is disabled for VXLAN overlay.
All the advertised local MAC routes are withdrawn.
The following table captures the configuration events in Auto EVI configuration mode:
Table 3. Auto EVI configuration eventsAuto EVI configuration events
Current system state --->
Current configuration event
|
|
V
Start up
1. evpn disabled
2. auto-evi
1. evpn
BGP peer is notified with EVPN capability
N/A
2. virtual-network 10
vxlan-vni 100
.
N/A
A new EVI with VNI 100 is created automatically.
RD and RT are generated automatically.
BGP Peer is notified with inclusive multicast route update.
Forwarding path is enabled with VXLAN overlay.
Remote MAC learning is disabled.
4. virtual-network deleted
N/A
EVI with VNI 100 is deleted.
BGP Peer is notified with inclusive multicast route withdrawal notification.
Forwarding path is disabled for VXLAN overlay.
All the advertised local MAC routes are withdrawn.
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