- Written by Hyun Chul Chung
- Posted on June 10, 2020
- Updated on October 14, 2021
- 8477 Views
As of EOS 4.22.0F, EVPN all active multihoming is supported as a standardized redundancy solution. Redundancy
- Written by Jesper Skriver
- Posted on April 25, 2022
- Updated on July 10, 2024
- 6865 Views
Route reflectors are commonly used to distribute routes between BGP peers belonging to the same autonomous system. However, this can lead to non-optimal path selection. The reason for this is that the route reflector chooses the optimal route based on IGP cost from its perspective. This may not be optimal from the perspective of the client as its location may be different from the RR
- Written by Pintu Kumar
- Posted on June 17, 2019
- Updated on June 19, 2019
- 11462 Views
This feature extends the BGP Layer 3 VPN Import/Export and VRF Route Leaking functionality to “default” VRF.
- Written by Alton Lo
- Posted on November 23, 2020
- Updated on November 23, 2020
- 8670 Views
To use IPv6 addresses for VXLAN underlay, there are two different approaches. The first approach is to make use of
- Written by Denis Evoy
- Posted on August 20, 2020
- Updated on August 20, 2020
- 12879 Views
In a Service Provider network, a Provider Edge (PE) device learns VPN paths from remote PEs and uses the Route Target
- Written by Madhu Sudan
- Posted on April 26, 2021
- Updated on April 26, 2021
- 8519 Views
This feature allows a Data Center (DC) operator to incrementally migrate their VXLAN network from IPv4 to IPv6
- Written by Amit Ranpise
- Posted on November 11, 2019
- Updated on May 10, 2024
- 12129 Views
As described in the Multi-VTEP MLAG TOI, singly connected hosts can lead to suboptimal peer-link utilization. By adding a local VTEP to each MLAG peer, the control plane is able to advertise singly connected hosts as being directly behind a specific local VTEP / MLAG peer.
- Written by Alton Lo
- Posted on November 6, 2023
- Updated on November 20, 2023
- 3939 Views
RFC7432 defines the MAC/IP advertisement NLRI (route type 2) for exchanging EVPN overlay end-hosts MAC addresses reachability information. When an EVPN MAC/IP route contains more than one path to the same L2 destination, the EVPN MAC/IP best-path selection algorithm determines which of these paths should be considered as the best path to that L2 destination.
- Written by Alton Lo
- Posted on March 18, 2020
- Updated on April 4, 2024
- 17138 Views
In the Centralized Anycast Gateway configuration, the Spines are configured with EVPN IRB and are used as the IP
- Written by Arup Raton Roy
- Posted on August 24, 2020
- Updated on December 27, 2021
- 8105 Views
This feature enables support for Macro Segmentation Service (MSS) to insert security devices into the traffic path
- Written by Alton Lo
- Posted on May 14, 2024
- Updated on May 15, 2024
- 1916 Views
This new feature explains the use of the BGP Domain PATH (D-PATH) attribute that can be used to identify the EVPN domain(s) through which the EVPN MAC-IP routes have passed. EOS DCI Gateway provides new mechanisms for users to specify the EVPN Domain Identifier for its local and remote domains. DCI Gateways sharing the same redundancy group should share the same local domain identifier and same remote domain identifier.
- Written by Mason Rumuly
- Posted on March 3, 2023
- Updated on March 6, 2023
- 7379 Views
Multihoming in EVPN allows a single customer edge (CE) to connect to multiple provider edges (PE or tunnel endpoint). In any multihoming EVPN instance (EVI), for each ethernet segment a designated forwarder is elected using EVPN type 4 Ethernet Segment (ES) routes sent through BGP. In single-active mode, the designated forwarder (DF) is responsible for sending and receiving all traffic. In all-active mode, the DF is only used to determine whether broadcast, unknown
- Written by Aaron Bamberger
- Posted on April 23, 2020
- Updated on February 13, 2024
- 9498 Views
E-Tree is an L2 EVPN service (defined in RFC8317) in which each attachment circuit (AC) is assigned the role of Root or Leaf. Once roles are assigned, the following forwarding rules are enforced:
- Written by Lavanya Conjeevaram
- Posted on March 31, 2017
- Updated on November 29, 2023
- 12160 Views
Ethernet VPN (EVPN) is an extension of the BGP protocol introducing a new address family: L2VPN (address family
- Written by Alton Lo
- Posted on September 26, 2023
- Updated on September 26, 2023
- 4069 Views
EVPN route advertisements carry RD and RT. RD (Route Distinguisher) : prepend to the tenant’s IP Prefix or MAC address to make it globally unique. RT (Route Target) : a BGP extended community used to tag the EVPN route. The EVPN import policy is chosen to select what is the target tenant VRF is imported from the global EVPN table.
- Written by Lavanya Conjeevaram
- Posted on December 22, 2017
- Updated on August 16, 2024
- 8549 Views
In the traditional data center design, inter-subnet forwarding is provided by a centralized router, where traffic traverses across the network to a centralized routing node and back again to its final destination. In a large multi-tenant data center environment this operational model can lead to inefficient use of bandwidth and sub-optimal forwarding.
- Written by Jeffrey Nelson
- Posted on March 5, 2020
- Updated on July 31, 2023
- 10458 Views
This feature adds control plane support for inter subnet forwarding between EVPN and IPVPN networks. It also
- Written by Jeff Wen
- Posted on January 21, 2019
- Updated on November 30, 2023
- 9372 Views
In the traditional data center design, inter-subnet forwarding is provided by a centralized router, where traffic traverses across the network to a centralized routing node and back again to its final destination. In a large multi-tenant data center environment this operational model can lead to inefficient use of bandwidth and sub-optimal forwarding.
- Written by Jeffrey Nelson
- Posted on October 28, 2020
- Updated on August 11, 2023
- 20109 Views
This feature adds control plane support for inter subnet forwarding between EVPN networks. This support is achieved
- Written by May Young
- Posted on June 24, 2021
- Updated on June 24, 2021
- 10132 Views
This feature is available when configuring Layer2 EVPN or EVPN IRB. As described in RFC7432 section 15
- Written by Alton Lo
- Posted on January 23, 2019
- Updated on January 23, 2019
- 14379 Views
“MLAG Domain Shared Router MAC” is a new mechanism to introduce a new router MAC to be used for MLAG TOR
- Written by Wade Carpenter
- Posted on April 24, 2020
- Updated on July 15, 2024
- 15383 Views
EVPN MPLS VPWS (RFC 8214) provides the ability to forward customer traffic to / from a given attachment circuit (AC) without any MAC lookup / learning. The basic advantage of VPWS over an L2 EVPN is the reduced control plane signalling due to not exchanging MAC address information. In contrast to LDP pseudowires, EVPN MPLS VPWS uses BGP for signalling. Port based and VLAN based services are supported.
- Written by Ayush
- Posted on January 31, 2024
- Updated on January 31, 2024
- 3031 Views
In network deployments, where border leaf or Superspine act as PEG and it is in the transit path to other multicast VTEPs, the multicast stream will not pass since the border leaf will decapsulate the packet even if it doesn't have a receiver. This transit node is called the Bud Node. The device should be able to send decapsulated packets to any local receivers as well as send the encapsulated packets to other VTEPs.
- Written by Narendra C R
- Posted on January 3, 2023
- Updated on May 28, 2024
- 5753 Views
EOS currently supports EVPN Multicast by setting up PIM tunnels in the underlay with VXLAN as the transport. While this is an efficient delivery mechanism, it requires PIM to be deployed in the underlay. In certain cases, the overheads of provisioning/maintaining the multicast routers and the multicast routing state in the underlay may be significant. To support such scenarios, Ingress Replication (IR) or Head-End Replication (HER) can be used in the underlay to distribute overlay multicast traffic.
- Written by Alton Lo
- Posted on June 29, 2023
- Updated on June 30, 2023
- 5591 Views
EVPN Multihoming defines a mechanism for Multihoming PEs to quickly signal, to remote PEs, a failure in an Ethernet Segment (ES) connectivity with the use of Ethernet A-D per ES route
- Written by Chris Hydon
- Posted on April 20, 2021
- Updated on October 25, 2023
- 10181 Views
Multihoming in EVPN allows a single customer edge (CE) to connect to multiple provider edges (PE or tunnel endpoint).
- Written by Chris Hydon
- Posted on October 20, 2022
- Updated on April 13, 2023
- 7135 Views
In EVPN, an overlay index is a field in type-5 IP Prefix routes that indicates that they should resolve indirectly rather than using resolution information contained in the type-5 route itself. Depending on the type of overlay index, this resolution information may come from type-1 auto discovery or type-2 MAC+IP routes. For this feature the gateway IP address field of the type-5 NLRI is used as the overlay index, which matches the target IPv4 / IPv6 address in the type-2 NLRI.
- Written by Alton Lo
- Posted on April 27, 2020
- Updated on July 14, 2023
- 7992 Views
As described in the L3 EVPN VXLAN Configuration Guide, it is common practice to use Layer 3 EVPN to provide multi
- Written by Christoph Schwarz
- Posted on August 23, 2022
- Updated on October 21, 2022
- 8106 Views
Flexible cross-connect service is an extension of EVPN MPLS Virtual Private Wire Service (VPWS) (RFC 8214). It allows for multiplexing multiple attachment circuits across different Ethernet Segments and physical interfaces into a single EVPN VPWS service tunnel while still providing single-active and all-active multi-homing.
- Written by Xuan Qi
- Posted on March 13, 2020
- Updated on March 13, 2020
- 10555 Views
In EOS 4.22.0F, EVPN VXLAN all active multi homing L2 support is available. A customer edge (CE) device can connect to
- Written by Chris Hydon
- Posted on June 17, 2019
- Updated on January 25, 2024
- 21384 Views
Ethernet VPN (EVPN) networks normally require some measure of redundancy to reduce or eliminate the impact of outages and maintenance. RFC7432 describes four types of route to be exchanged through EVPN, with a built-in multihoming mechanism for redundancy. Prior to EOS 4.22.0F, MLAG was available as a redundancy option for EVPN with VXLAN, but not multihoming. EVPN multihoming is a multi-vendor standards-based redundancy solution that does not require a dedicated peer link and allows for more flexible configurations than MLAG, supporting peering on a per interface level rather than a per device level. It also supports a mass withdrawal mechanism to minimize traffic loss when a link goes down.
- Written by Xuan Qi
- Posted on October 20, 2022
- Updated on September 19, 2024
- 5686 Views
EVPN gateway support for all-active (A-A) multihoming adds a new redundancy model to our multi-domain EVPN solution introduced in [1]. This deployment model introduces the concept of a WAN Interconnect Ethernet Segment identifier (WAN I-ESI). The WAN I-ESI allows the gateway’s EVPN neighbors to form L2 and L3 overlay ECMP on routes re-exported by the gateways. The identifier is shared by gateway nodes within the same domain (site) and set in MAC-IP routes that cross domain boundaries.
- Written by Mitchell Jameson
- Posted on February 5, 2020
- Updated on February 5, 2020
- 7119 Views
This feature enables support for an EVPN VxLAN control plane in conjunction with Arista’s OpenStack ML2 plugin for
- Written by Aadil
- Posted on December 20, 2019
- Updated on December 20, 2019
- 10079 Views
Starting with EOS release 4.22.0F, the EVPN VXLAN L3 Gateway using EVPN IRB supports routing traffic from one IPV6
- Written by Alton Lo
- Posted on June 14, 2019
- Updated on October 7, 2019
- 8731 Views
Starting with EOS release 4.22.0F, the EVPN VXLAN L3 Gateway using EVPN IRB supports routing traffic from IPV6 host to
- Written by Kallol Mandal
- Posted on November 14, 2019
- Updated on December 22, 2020
- 11054 Views
Starting with EOS release 4.22.0F, the EVPN VXLAN L3 Gateway using EVPN IRB supports routing traffic from one IPV6
- Written by Aaron Bamberger
- Posted on October 28, 2020
- Updated on October 28, 2020
- 8679 Views
In a traditional EVPN VXLAN centralized anycast gateway deployment, multiple L3 VTEPs serve the role of the
- Written by Mitchell Jameson
- Posted on August 24, 2020
- Updated on October 6, 2023
- 8002 Views
Typical Wi Fi networks utilize a single, central Wireless LAN Controller (WLC) to act as a gateway between the
- Written by Kamlesh Raghuvanshi
- Posted on April 19, 2021
- Updated on August 20, 2024
- 6040 Views
There are use cases where all broadcast, multicast and unknown MAC traffic are not needed to be flooded into the
- Written by Shamit Kapadia
- Posted on February 23, 2021
- Updated on February 5, 2022
- 6385 Views
In EVPN deployment with VXLAN underlay when an EVPN type 5 prefix is imported into an IP VRF, the IGP cost of the underlay
- Written by Bharathram Pattabhiraman
- Posted on August 31, 2023
- Updated on September 4, 2023
- 5149 Views
This solution allows delivery of IPv6 multicast traffic in an IP-VRF using an IPv4 multicast in the underlay network. The protocol used to build multicast trees in the underlay network is PIM Sparse Mode.
- Written by Madhu Sudan
- Posted on June 21, 2020
- Updated on February 21, 2024
- 9400 Views
Several customers have expressed interest in using IPv6 addresses for VXLAN underlay in their Data Centers (DC). Prior to 4.24.1F, EOS only supported IPv4 addresses for VXLAN underlay, i.e., VTEPs were reachable via IPv4 addresses only.
- Written by Adam Morrison
- Posted on January 3, 2022
- Updated on January 3, 2022
- 8087 Views
As of EOS 4.22.0F, EVPN all active multihoming is supported as a standardized redundancy solution. For effective
- Written by Kaladhar Musunuru
- Posted on May 4, 2020
- Updated on August 16, 2024
- 3822 Views
Ethernet VPN (EVPN) is an extension of the BGP protocol introducing a new address family: L2VPN (address family number 25) / EVPN (subsequent address family number 70). It is used to exchange overlay MAC and IP address reachability information between BGP peers using type-2 routes, but additionally, EVPN supports the exchange of layer 3 IPv4 and IPv6 overlay routes through the extensions described in (type 5 EVPN routes).
- Written by Bharathram Pattabhiraman
- Posted on February 11, 2021
- Updated on June 15, 2022
- 14687 Views
This solution allows the delivery of customer BUM (Broadcast, Unknown unicast and Multicast) traffic in a VLAN using
- Written by Bharathram Pattabhiraman
- Posted on August 31, 2023
- Updated on September 4, 2023
- 4657 Views
This solution optimizes the delivery of multicast to a VLAN over an Ethernet VPN (EVPN) network. Without this solution IPv6 multicast traffic in a VLAN is flooded to all Provider Edge(PE) devices which contain the VLAN.
- Written by Jeffrey Nelson
- Posted on June 21, 2021
- Updated on July 17, 2024
- 37019 Views
This feature provides the ability to interconnect EVPN VXLAN domains. Domains may or may not be within the same data
- Written by Xuan Qi
- Posted on August 23, 2022
- Updated on April 4, 2024
- 8683 Views
This feature extends the multi-domain EVPN VXLAN feature introduced to support interconnect with EVPN MPLS networks. The following diagram shows a multi-domain deployment with EVPN VXLAN in the data center and EVPN MPLS in the WAN. Note that this is the only supported deployment model, and that an EVPN MPLS network cannot peer with an EVPN MPLS network.
- Written by Swati Patel
- Posted on February 11, 2021
- Updated on September 25, 2024
- 11823 Views
[L2 EVPN] and [Multicast EVPN IRB] solutions allow for the delivery of customer BUM (Broadcast, Unknown unicast
- Written by Bharathram Pattabhiraman
- Posted on February 11, 2021
- Updated on September 21, 2023
- 23596 Views
This solution allows delivery of multicast traffic in an IP VRF using multicast in the underlay network. It builds on