Connectivity Guide

• For a 2-byte ASN, the RT type is set to 0200 (Type 0 in RFC 4364). The RT value is encoded in the format described in section 5.1.2.1
of RFC 8365: 2-octet-ASN: 4-octet-number, where the following values are used in the 4-octet-number eld:
– Type: 1
– D-ID: 0
– Service-ID: VNI
• For a 4-byte ASN, OS10 can auto-congure RTs for both 2-byte and 4-byte ASNs. The RT type is set to 0202 (Type 2 in RFC 4364).
The RT value is encoded in the format: 4-octet-ASN: 2-octet-number, where the 2-octet-number eld contains the EVI ID. In auto-EVI
mode, the EVI ID is the same as the virtual network ID (VNID). Therefore, in 4-byte ASN deployment, OS10 supports RT auto-
conguration if the VNID-to-VNI mapping is the same on all VTEPs.
Congure BGP EVPN for VXLAN
To set up BGP EVPN service in a VXLAN overlay network:
1 Congure the VXLAN overlay network (see Congure VXLAN). If you enable routing for VXLAN virtual networks, integrated routign
and bridging (IRB) for BGP EVPN is automatically enabled.
2 Congure BGP to advertise EVPN routes.
3 Congure EVPN, including the VNI, RD, and RT values associated with the EVPN instance.
4 Verify the BGP EVPN conguration.
Usage guidelines
• Only EVPN bridging (L2 gateway) functionality is supported.
• All broadcast, multicast, and unknown unicast (BUM) trac received from hosts is transmitted to all remote VTEPs using VXLAN
EVPN ingress replication, which maintains a list of remote VTEP IP addresses.
• Only EVPN route types 2 and 3 are supported.
• VLT is not supported on leaf nodes in VXLAN BGP EVPN.
• OS10 only supports asymmetric IRB. Symmetric IRB is not supported.
Conguration
1 Congure BGP to advertise EVPN routes.
EVPN requires that you establish MP-BGP sessions between leaf and spine nodes in the underlay network. On each spine and leaf
node, congure at least two BGP peering sessions:
• A directly connected BGP peer in the underlay network to advertise VTEP and loopback IP addresses using the IPv4 unicast
address family
• A BGP peer in the overlay network to advertise overlay information using the EVPN address family. In BGP peer sessions in the
overlay, activate only the EVPN address family.
For each BGP peer session in the underlay network:
a Create a BGP instance in CONFIGURATION mode. You enter router BGP conguration mode.
router bgp as-number
b Assign an IP address to the BGP instance in ROUTER-BGP mode.
router-id ip-address
c Enter IPv4 address-family conguration mode from ROUTER-BGP mode.
address-family ipv4 unicast
d Advertise the IPv4 prex to BGP peers in the address family in ROUTER-BGP-ADDRESS-FAMILY mode.
network ip-address/mask
e Return to ROUTER-BGP mode.
exit
f Congure the BGP peer address in ROUTER-BGP mode.
neighbor ip-address
VXLAN
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