Cisco ASR 9000 Series Configuration Manuallines page 391

Implementing IEEE 802.1ah Provider Backbone Bridge
EVPN Instance
E-VPN Instance (EVI) identifies a VPN in the MPLS/IP network. There can only be one EVI per core bridge.
Ethernet Segment
Ethernet Segment is a site connected to one or more PEs. The Ethernet Segment could be a single device (i.e.
Customer Edge (CE)) or an entire network, such as:
• Single-Homed Device (SHD)
• Multi-Homed Device (MHD) using Ethernet Multi-chassis Link Aggregation Group
• Single-Homed Network (SHN)
• Multi-Homed Network (MHN)
The Ethernet segment is uniquely identified by a 10-byte global Ethernet Segment Identifier (ESI).
The ESI format is RFC 7432 complaint. The ESI value depends on the ESI type. Currently, only ESI type 0
and 1 are supported. The following table shows the ESI format based on the ESI type.
ESI Type
Type 0
Type 1
The following figure illustrates an example of Ethernet segment and ESI.
Figure 47: Ethernet Segment
PBB-EVPN BGP Routes
PBB-EVPN defines a single new BGP network layer reachability information (NLRI) used to advertise
different types of routes along with new attributes.
L2VPN and Ethernet Services Configuration Guide for Cisco ASR 9000 Series Routers, IOS XR Release 6.3.x
Explanation
Arbitrary ESI value based on
configuration
Auto-generated ESI value based on
LACP
PBB-EVPN Overview
ESI Format
1 octet ESI Type 0x00
9 octet ESI value
1 octet ESI Type 0x01
6 octet CE LACP MAC address
2 octet CE LACP Port Key
1 octet value of 0x00
365