Cisco ASR 9000 Series Configuration Guidelines

Route Distinguisher: 200.0.1.1:1
*>i[3][0][32][200.0.1.1]/80
200.0.1.1 100 0 i
Route Distinguisher: 200.0.1.1:2
*>i[3][0][32][200.0.1.1]/80
200.0.1.1 100 0 i
Route Distinguisher: 200.0.1.1:3
*>i[3][0][32][200.0.1.1]/80
200.0.1.1 100 0 i
Route Distinguisher: 200.0.1.1:4
*>i[3][0][32][200.0.1.1]/80
200.0.1.1 100 0 i
Route Distinguisher: 200.0.3.1:1 (default for vrf bd-1-1)
*>i[3][0][32][200.0.1.1]/80
200.0.1.1 100 0 i
*> [3][0][32][200.0.3.1]/80
0.0.0.0 0 i
Route Distinguisher: 200.0.3.1:2 (default for vrf bd-1-2)
*>i[3][0][32][200.0.1.1]/80
200.0.1.1 100 0 i
*> [3][0][32][200.0.3.1]/80
0.0.0.0 0 i
Route Distinguisher: 200.0.3.1:3 (default for vrf bd-1-3)
*>i[3][0][32][200.0.1.1]/80
200.0.1.1 100 0 i
*> [3][0][32][200.0.3.1]/80
0.0.0.0 0 i
Route Distinguisher: 200.0.3.1:4 (default for vrf bd-1-4)
*>i[3][0][32][200.0.1.1]/80
200.0.1.1 100 0 i
*> [3][0][32][200.0.3.1]/80
0.0.0.0 0 i
EVPN Single-Active Multi-Homing
The EVPN Single-Active Multi-Homing feature supports single-active redundancy mode. In single-active
mode, the PE nodes locally connected to an Ethernet Segment load balance traffic to and from the Ethernet
Segment based on EVPN service instance (EVI). Within an EVPN service instance, only one PE forwards
traffic to and from the Ethernet Segment.
Figure 79: EVPN: Single-Active Multi-Homing
Here is a topology in which CE1 is multihomed to PE1 and PE2. PE1 and PE2 are connected to PE3 through
MPLS core. CE3 is connected to PE3 through an Ethernet 'interface bundle. PE1 and PE2 advertise Type 4
routes, and then do designated forwarder (DF) election. The non-DF blocks the traffic in both the directions
in single-active mode.
Consider a traffic flow from CE1 to CE2. CE1 sends an address resolution protocol (ARP) broadcast request
to both PE1 and PE2. If PE1 is the designated forwarder for the EVI, PE1 forwards the ARP request from
CE1. PE2 drops the traffic from CE1. Thereafter, all the unicast traffic is sent through PE1. PE2 will be
L2VPN and Ethernet Services Configuration Guide for Cisco ASR 9000 Series Routers, IOS XR Release 6.3.x
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EVPN Features
EVPN Single-Active Multi-Homing

Cisco ASR 9000 Series Specifications

General

Series	ASR 9000
Category	Network Router
Modular Design	Yes
Redundancy	Yes (Hardware and Software)
Operating System	Cisco IOS XR
Interfaces/Ports	10G, 40G, 100G, 400G Ethernet
Expansion Slots	Varies by model
Routing Protocol	BGP, OSPF, IS-IS, EIGRP
Management	CLI, SNMP, NETCONF
Power Supply	Redundant
Port Density	Varies by model
Power Supply Options	AC, DC
Memory	Varies by model
Storage	Varies by model
Dimensions	Varies by model
Weight	Varies by model