Category: EVPN

EVPN FAQ

What is EVPN?

Ethernet VPN (EVPN) is a new technology that is used to extend Ethernet circuits across Data Center and Service Provider networks. It is expected to succeed other L2VPN transport methods such as BGP-based L2VPN (RFC6624), LDP-Based L2VPN (RFC4906) and VPLS.

EVPN introduces a set of new features that were not available in L2VPN and VPLS environments, most noticeable of which are All-Active Multi-homing across multiple PE devices and more efficient handling of L2 Multicast traffic.

Refer to RFC 7209 to better understand the rationale for creating EVPN.
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EVPN Type 6 (Selective Multicast Ethernet Tag Route) Explained

EVPN Type 6 (Selective Multicast Ethernet Tag Route) Explained

EVPN Type 6 Route is defined in IGMP and MLD Proxy for EVPN IETF draft. The purpose of this route is to distribute Host’s or VM’s intent to receive Multicast traffic for a certain Multicast Group (*,G) or Source-Group combination (S,G).
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Need for IGMP and MLD Proxy in EVPN Environment

Section 16 of EVPN RFC7432 defines the mechanism for forwarding multicast traffic within EVPN networks. Ingress Replication and/or P2MP LSPs may be used for Multicast forwarding. The major shortcoming of Multicast forwarding approach defined in RFC7432 is the lack of per-group multicast trees, meaning that Multicast traffic is getting forwarded to all PE devices participating in a given EVPN instance, regardless of presence of interested receivers.
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EVPN Route Types

Route Type Description RFC Route Type Explained
0 Reserved RFC 7432
1 Ethernet Auto-Discovery (A-D) route RFC 7432 EVPN Type 1 Explained
2 MAC/IP advertisement route RFC 7432 EVPN Type 2 Explained
3 Inclusive Multicast Route RFC 7432 EVPN Type 3 Explained
4 Ethernet Segment Route RFC 7432 EVPN Type 4 Explained
5 IP Prefix Route draft-ietf-bess-evpn-prefix-advertisement-04 EVPN Type 5 Explained
6 Selective Multicast Ethernet Tag Route draft-ietf-bess-evpn-igmp-mld-proxy-00 EVPN Type 6 Explained
7 IGMP Join Synch Route draft-ietf-bess-evpn-igmp-mld-proxy-00 EVPN Type 7 Explained
8 IGMP Leave Synch Route draft-ietf-bess-evpn-igmp-mld-proxy-00  EVPN Type 8 Explained
9 Per-Region I-PMSI A-D route draft-ietf-bess-evpn-bum-procedure-updates-01
10 S-PMSI A-D route draft-ietf-bess-evpn-bum-procedure-updates-01
11 Leaf A-D route draft-ietf-bess-evpn-bum-procedure-updates-01
12-255 Unassigned

 

Inter-subnet routing in EVPN MPLS Environment

In this article, we will review inter-subnet routing scenarios in EVPN environment. As we will discover, certain topologies might lead to sub-optimal traffic flows within EVPN network.

Our setup will be comprised of three PE and four CE devices as shown below:

Inter-subnet routing in EVPN Environment
Inter-subnet routing in EVPN Environment

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EVPN Type 5 Configuration Example – Juniper MX

Introduction

In this example, we will show how to configure L2 and L3 EVPN service on Juniper MX devices.

If you are not familiar with EVPN, please review our introductory articles on EVPN.

In this lab, we will leverage our previous example, where we delivered L2 connectivity between multiple sites, and will augment it with L3 site-to-site connectivity options.

One shared broadcast domain with IP range 1.1.1.0/24 is used on PE-CE interfaces across the entire network. Each CE site is assigned a unique subnet on LAN interface.

EVPN Type 5 Lab Topology
EVPN Type 5 Lab Topology

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EVPN Type 5 (IP Prefix Route) Explained

EVPN Type 5 route that is proposed in ‘IP Prefix Advertisement in EVPN’ draft is a mechanism to carry IPv4 and IPv6 advertisements in EVPN-only networks. While EVPN Type 2 routes allow to carry both MAC addresses and IP addresses, tight coupling of specific IP addresses with IP Prefixes might not be desirable. Section 2.2 of the draft discusses different scenarios where such coupling is nor desirable.

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EVPN MPLS Service Types Illustrated

EVPN VLAN-Based Service

With this service interface, an EVPN instance consists of only a single broadcast domain (e.g., a single VLAN).  Therefore, there is a one-to-one mapping between a VID on this interface and a MAC-VRF. Since a MAC-VRF corresponds to a single VLAN, it consists of a single bridge table corresponding to that VLAN.

EVPN VLAN-Based Service
EVPN VLAN-Based Service

Click here for Juniper MX Configuration Example.

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EVPN MPLS Service Types

Broadcast Domains

(VLANs)

 Bridge Table MAC VLAN to MAC-VRF Mapping Ethernet TAG ID VID Translation
VLAN-Based Service Single Single Can overlap between VLANs one-to-one 0 Egress PE
VLAN Bundle Service Multiple Single Unique for all VLANs many-to-one 0 Not Supported
Port-Based Service Multiple Single Unique for all VLAN many-to-one 0 Not Supported
VLAN-Aware Bundle Service Multiple One per VLAN Can overlap between VLANs many-to-one VID or normalized TAG ID

 

 Supported
Port-Based VLAN-Aware Service Multiple One per VLAN Can overlap between VLANs many-to-one VID

 

 Not Supported

For more information on EVPN, please refer to our other articles on this topic:

http://www.bgphelp.com/tag/evpn/