EBGP for the Overlay
This section briefly describes EBGP for the overlay feature and its configuration on the QFX5220, QFX5230, QFX5240, and QFX5241 Switches.
Overview
External Border Gateway Protocol (EBGP) for the overlay means using EVPN signaling and peering in the VXLAN overlay networks, specifically in IPv6 fabric designs on the QFX5220, QFX5230, QFX5240, and QFX5241 Switches. EBGP peers between IPv6 loopback addresses of these QFX Series switches to handle EVPN signaling for VXLAN tunnels. This feature simplifies scaling in EVPN-VXLAN fabrics, enhances reliability with BFD, and supports efficient load balancing in multistage Clos topologies.Configure EBGP for the Overlay
To enable EBGP and set router ID:
set routing-options router-id loopback-ip
To configure EBGP group and neighbors for the spine and leaf overlay:
set protocols bgp group overlay type external set protocols bgp group overlay local-address loopback-ip set protocols bgp group overlay family inet unicast set protocols bgp group overlay family evpn set protocols bgp group overlay peer-as remote-as set protocols bgp group overlay neighbor peer-loopback-ip
To add BFD for multihop overlay sessions:
set protocols bgp group BGP-group-name multihop set protocols bgp group BGP-group-name multihop ttl EBGP-multihop-ttl set protocols bgp group BGP-group-name neighbor peer-loopback-ip bfd-liveness-detection minimum-interval bfd-min-interval-ms set protocols bgp group BGP-group-name neighbor peer-loopback-ip bfd-liveness-detection multiplier bfd-multiplier
Verify EBGP for the Overlay Configuration
To verify that EBGP is functional on the QFX5220, QFX5230, QFX5240, and QFX5241 Switches:
show bgp summary
To view detailed overlay session details such as status, configuration, and statistics for BGP neighbors:
show bgp neighbor
To view overlay routes in case EVPN is configured:
show evpn database
For more information about how to configure EBGP for IPv6 overlay peering, see Configure EBGP for IPv6 Overlay Peering.