Dell SmartFabric OS10 User Guide Release 10.5.3

PDF

EVPN configuration events and system behavior

In SmartFabric OS10, configuring EVPN instances and attaching virtual networks to EVPN instances, can happen in any order. The following section summarizes, configuration sequence and SmartFabric 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:

Table 1. EVPN instance configuration sequenceEVPN instance configuration sequence

Spine

Leaf

OS10# show running-configuration bgp
!
router bgp 100
 router-id 110.111.170.195
 !
 address-family ipv4 unicast
 redistribute connected
 !
 neighbor 11.1.1.2
 remote-as 101
 no shutdown
 !
 address-family ipv4 unicast
 no sender-side-loop-detection
 !
 neighbor 110.111.170.102
 ebgp-multihop 2
 remote-as 101
 send-community extended
 update-source loopback1
 no shutdown
 !
 address-family ipv4 unicast
 no activate
 !
 address-family l2vpn evpn
 activate
 !

OS10# show running-configuration bgp
!
router bgp 101
 router-id 110.111.170.102
 !
 address-family ipv4 unicast
 redistribute connected
 !
 neighbor 11.1.1.1
 remote-as 100
 no shutdown
 !
 address-family ipv4 unicast
 allowas-in 1
 !
 neighbor 110.111.170.195
 ebgp-multihop 2
 remote-as 100
 send-community extended
 update-source loopback1
 no shutdown
 !
 address-family ipv4 unicast
 no activate
 !
 address-family l2vpn evpn
 activate

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.