Cisco Nexus 9000 Series Configuration Manual page 135
Nx-os vxlan
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- Configuration manual (562 pages) ,
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- Quick start configuration manual (6 pages)
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Configuring VXLAN EVPN Multihoming
The Ethernet Segment Route is used to elect the Designated Forwarder and to apply Split Horizon Filtering.
All the switches that are configured with an Ethernet Segment originate from this route. Ethernet Segment
Route is exported and imported when ESI is locally configured under the PC.
Ethernet Segment Route (Route Type 4)
NLRI
ATTRS
DF Election and VLAN Carving
Upon configuration of the ESI, both L1 and L2 advertises the ES route. The ESI MAC is common between
L1 and L2 and unique in the network. Therefore, only L1 and L2 import each other's ES routes.
Figure 28: If VLAN % count equals to ordinal, take up DF role.
Core and Site Failures for BUM Traffic
If the access link pertaining to ES1 fails at L1, L1 withdraws the ES route for ES1. This leads to a change
triggering re-compute the DF. Since L2 is the only TOR left in the Ordinal Table, it takes over DF role for
all VLANs.
BGP EVPN multihoming on Cisco Nexus 9000 Series switches provides minimum operational and cabling
expenditure, provisioning simplicity, flow based load balancing, multi pathing, and fail-safe redundancy.
Route Type
RD
ESI
Originator IP
ES-Import RT
Cisco Nexus 9000 Series NX-OS VXLAN Configuration Guide, Release 7.x
EVPN Multihoming BUM Flows
Ethernet Segment (Type 4)
Router-ID: Base + Port Channel
Number
<Type : 1B><MAC : 6B><LD :
3B>
NVE loopback IP
6 Byte MAC derived from ESI
123
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