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Border gateway protocol tag

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Not All Virtual Route Reflectors Are Created Equal

By: Mae Kowalke, TMCnet Contributor

Border gateway protocol (BGP) route reflectors have played an important role for decades, since they help remove the need for a full internal BGP mesh within an autonomous system.

Currently, most route reflectors run either on a router that is dedicated to route reflection, or on routers that also perform other IP routing and service functions. Both scenarios have downsides.

Dedicated BGP route reflectors are a waste because route reflection functions require minimal data plane resources. Routers that juggle route reflection with other duties, on the other hand, may not have sufficient resources to support scalable route reflection.

Ethernet VPN Brings Distinct Advantages over Its Predecessor

By: Mae Kowalke, TMCnet Contributor

Ethernet services delivery based on the control plane approach hasn’t changed for proven solutions such as MPLS/VPLS and PBB. Layer 2 flooding and learning as an approach to build the forwarding database is still necessary, but this has inherent limitations.

A new approach has emerged that brings many benefits over the control plane approach in the form of Ethernet VPN (EVPN). With EVPN, the control plane and data planes are abstracted and separated. A multiprotocol BGP (MP-BGP) control plane protocol carries MAC/IP routing information, and there are several data plane encapsulation choices.

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